Vulnerability Description
SharpCompress is a fully managed C# library to deal with many compression types and formats. Versions prior to 0.29.0 are vulnerable to partial path traversal. SharpCompress recreates a hierarchy of directories under destinationDirectory if ExtractFullPath is set to true in options. In order to prevent extraction outside the destination directory the destinationFileName path is verified to begin with fullDestinationDirectoryPath. However, prior to version 0.29.0, it is not enforced that fullDestinationDirectoryPath ends with slash. If the destinationDirectory is not slash terminated like `/home/user/dir` it is possible to create a file with a name thats begins as the destination directory one level up from the 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. This issue is fixed in SharpCompress version 0.29.0.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sharpcompress Project | Sharpcompress | < 0.29.0 |
Related Weaknesses (CWE)
References
- https://github.com/adamhathcock/sharpcompress/pull/614PatchThird Party Advisory
- https://github.com/adamhathcock/sharpcompress/releases/tag/0.29.0Release NotesThird Party Advisory
- https://github.com/adamhathcock/sharpcompress/security/advisories/GHSA-jp7f-grcvExploitThird Party Advisory
- https://github.com/adamhathcock/sharpcompress/pull/614PatchThird Party Advisory
- https://github.com/adamhathcock/sharpcompress/releases/tag/0.29.0Release NotesThird Party Advisory
- https://github.com/adamhathcock/sharpcompress/security/advisories/GHSA-jp7f-grcvExploitThird Party Advisory
FAQ
What is CVE-2021-39208?
CVE-2021-39208 is a vulnerability with a CVSS score of 4.3 (MEDIUM). SharpCompress is a fully managed C# library to deal with many compression types and formats. Versions prior to 0.29.0 are vulnerable to partial path traversal. SharpCompress recreates a hierarchy of d...
How severe is CVE-2021-39208?
CVE-2021-39208 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-39208?
Check the references section above for vendor advisories and patch information. Affected products include: Sharpcompress Project Sharpcompress.