Description (CNA)
jsdiff is a JavaScript text differencing implementation. Prior to versions 8.0.3, 5.2.2, 4.0.4, and 3.5.1, attempting to parse a patch whose filename headers contain the line break characters `\r`, `\u2028`, or `\u2029` can cause the `parsePatch` method to enter an infinite loop. It then consumes memory without limit until the process crashes due to running out of memory. Applications are therefore likely to be vulnerable to a denial-of-service attack if they call `parsePatch` with a user-provided patch as input. A large payload is not needed to trigger the vulnerability, so size limits on user input do not provide any protection. Furthermore, some applications may be vulnerable even when calling `parsePatch` on a patch generated by the application itself if the user is nonetheless able to control the filename headers (e.g. by directly providing the filenames of the files to be diffed). The `applyPatch` method is similarly affected if (and only if) called with a string representation of a patch as an argument, since under the hood it parses that string using `parsePatch`. Other methods of the library are unaffected. Finally, a second and lesser interdependent bug - a ReDOS - also exhibits when those same line break characters are present in a patch's *patch* header (also known as its "leading garbage"). A maliciously-crafted patch header of length *n* can take `parsePatch` O(*n*³) time to parse. Versions 8.0.3, 5.2.2, 4.0.4, and 3.5.1 contain a fix. As a workaround, do not attempt to parse patches that contain any of these characters: `\r`, `\u2028`, or `\u2029`.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| kpdecker / jsdiff | affected >= 6.0.0, < 8.0.3; affected >= 5.0.0, < 5.2.2; affected >= 4.0.0, < 4.0.4; affected < 3.5.1 |
CWE
CWE-400, CWE-1333
References
- https://github.com/kpdecker/jsdiff/security/advisories/GHSA-73rr-hh4g-fpgx
- https://github.com/kpdecker/jsdiff/issues/653
- https://github.com/kpdecker/jsdiff/pull/649
- https://github.com/kpdecker/jsdiff/commit/15a1585230748c8ae6f8274c202e0c87309142f5
ADP enrichment
No English description supplied.
No references supplied.
A flaw was found in jsdiff. A specially crafted patch input containing specific line break characters can cause the parsePatch method to enter an infinite loop, leading to uncontrolled memory consumption and a process crash, resulting in a denial of service. The applyPatch method is similarly affected when called with a string representation of a patch as an argument. Additionally, a related vulnerability allows a Regular Expression Denial of Service (ReDoS) when these characters are present in a patch filename header, significantly increasing parsing time.