CVE-2021-32842 – sharpziplib

Package

Manager: nuget
Name: sharpziplib
Vulnerable Version: >=1.0.0 <1.3.3

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00298 pctl0.52643

Details

Path Traversal in SharpZipLib 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.

Metadata

Created: 2022-02-01T16:23:00Z
Modified: 2022-02-08T19:44:19Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/02/GHSA-mm6g-mmq6-53ff/GHSA-mm6g-mmq6-53ff.json
CWE IDs: ["CWE-22"]
Alternative ID: GHSA-mm6g-mmq6-53ff
Finding: F063
Auto approve: 1