Unicode 202E vuln fix #382
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| let url = this.getUrl(); | ||
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| //Strip malicious Unicode SNYK-AUTOLINKER-2438289 | ||
| url.replace('\u202E', ''); |
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Also, I suggest Strip the most RTLO common format U+202E and %E2%80%AE beside \u202E
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it should also be replaced globally with /\u202E/g
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would that be immune to ReDoS?
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Hey, not sure how this would actually fix the issue because the code isn't re-assigning the replacement result back to url. The code would need to be:
url = url.replace(/\u202E/g, '');Does your new test pass even without this new line of code?
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even after correction of the test (see remark in autolinker-url.spec.ts) the test is failing whatever the changes here:
- with this line
- with the update line according greg comment
- without this line
in my observation the \u202e char is never reaching this method because of parseHtml
Update so we can just merge everything
| describe('unicode exploits', () => { | ||
| it('should strip out Right-To-Left Override Unicode characters for security', () => { | ||
| var result = autolinker.link('https://legit.ok/files\u202E4pm.asia'); | ||
| expect(result).toBe('<a href="https://legit.ok/files4pm.asia"></a>'); |
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the expected result should be '<a href="https://legit.ok/files4pm.asia">legit.ok/files4pm.asia</a>'
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I even added a test, wow TDD works!