CVE-2021-32842
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| icsharpcode | sharpziplib | 1.3.3 < 1.3.3 | affected |
| icsharpcode | sharpziplib | 1.0.0 < 1.0.0* | affected |
Weaknesses
- CWE-22: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
ADP Enrichment
CVE Program Container
Additional References
- https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/
- https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: no
- Technical Impact: partial
References
- https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/
- https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3
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