Vulnerability Description
SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.3.0 and prior to version 1.3.3, a check was added if the destination file is under destination directory. However, it is not enforced that `destDir` ends with slash. If the `destDir` is not slash terminated like `/home/user/dir` it is possible to create a file with a name thats begins with the destination directory, i.e. `/home/user/dir.sh`. Because of the file name and destination directory constraints, the arbitrary file creation impact is limited and depends on the use case. Version 1.3.3 contains a patch for this vulnerability.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sharpziplib Project | Sharpziplib | >= 1.3.0, < 1.3.3 |
Related Weaknesses (CWE)
References
- https://github.com/icsharpcode/SharpZipLib/commit/5c3b293de5d65b108e7f2cd0ea8f81PatchThird Party Advisory
- https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3Release NotesThird Party Advisory
- https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/ExploitThird Party Advisory
- https://github.com/icsharpcode/SharpZipLib/commit/5c3b293de5d65b108e7f2cd0ea8f81PatchThird Party Advisory
- https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3Release NotesThird Party Advisory
- https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/ExploitThird Party Advisory
FAQ
What is CVE-2021-32841?
CVE-2021-32841 is a vulnerability with a CVSS score of 4.0 (MEDIUM). SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.3.0 and prior to version 1.3.3, a check was added if the destination file is under destination directory. However, it...
How severe is CVE-2021-32841?
CVE-2021-32841 has been rated MEDIUM with a CVSS base score of 4.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-32841?
Check the references section above for vendor advisories and patch information. Affected products include: Sharpziplib Project Sharpziplib.