GHSA-2x7h-96h5-rq84
Path Traversal in SharpZipLib
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| NuGet | SharpZipLib | >= 1.3.0, < 1.3.3 | 1.3.3 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2021-32841
- https://github.com/icsharpcode/SharpZipLib/commit/5c3b293de5d65b108e7f2cd0ea8f81c1b8273f78
- https://github.com/icsharpcode/SharpZipLib
- https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3
- https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib