Path Traversal in Icsharpcode Sharpziplib
CVE-2021-32841
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.011 (61.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Icsharpcode Sharpziplib — versions 1.3.3, 1.3.0
- Sharpziplib_project Sharpziplib
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC, Release Notes)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-32841?
- CVE-2021-32841 is a medium-severity vulnerability in Icsharpcode Sharpziplib, classified under Path Traversal. CVSS score: 4.0/10. Published 2022-01-26.
- How severe is CVE-2021-32841?
- Medium severity. CVSS v3 base score is 4.0 out of 10.