GitHub Advisoryadvisory · NuGet

GHSA-mm6g-mmq6-53ff Path Traversal in SharpZipLib

MEDIUM Published 2022-02-01 Modified 2022-02-08 Official page ↗
Aliases
CVE-2021-32842
Ecosystem
NuGet
Packages
SharpZipLib
Severity
Moderate
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weaknesses
CWE-22
Reviewed
2022-02-01

Affected packages

• NuGet SharpZipLib: >= 1.0.0, < 1.3.3 → fixed in 1.3.3

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.

Related

Alias · CVE (1)

  • CVE-2021-32842 SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. vulnerability

Weakness · CWE (1)

  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness

References