CVE-2021-32842

Public Exploit
Path Traversal in SharpZipLib

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.

Category

4.0
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.28%
Third-Party Advisory github.com Third-Party Advisory github.com
Affected: icsharpcode sharpziplib
Published at:
Updated at:

References

Frequently Asked Questions

What is the severity of CVE-2021-32842?
CVE-2021-32842 has been scored as a medium severity vulnerability.
How to fix CVE-2021-32842?
To fix CVE-2021-32842, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-32842 being actively exploited in the wild?
It is possible that CVE-2021-32842 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-32842?
CVE-2021-32842 affects icsharpcode sharpziplib.
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