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.
References (2)
Core 2
Core References
Exploit, Third Party Advisory x_refsource_confirm
https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/
Release Notes, Third Party Advisory x_refsource_misc
https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3
Scores
CVSS v3
4.0
EPSS
0.0030
EPSS Percentile
53.2%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-22
Status
published
Products (2)
nuget/SharpZipLib
1.0.0 - 1.3.3NuGet
sharpziplib_project/sharpziplib
1.0.0 - 1.3.3
Published
Jan 26, 2022
Tracked Since
Feb 18, 2026