CVE-2021-32842
Last modified
CVE-2021-32842 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.0.0 and prior to version 1.3.3, a check was added if the destination file is under a destination directory. EPSS estimates a 0.90% chance of exploitation in the next 30 days.
Description
SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.0.0 and prior to version 1.3.3, a check was added if the destination file is under a destination directory. However, it is not enforced that `_baseDirectory` ends with slash. If the _baseDirectory 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. Version 1.3.3 fixed this vulnerability.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Sharpziplib Project | Sharpziplib | >= 1.0.0, < 1.3.3 |
References
- https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3Release Notes, Third Party Advisory
- https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/Exploit, Third Party Advisory
- https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3Release Notes, Third Party Advisory
- https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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