CVE-2021-32842

描述

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.

如何修補 CVE-2021-32842

要修補 CVE-2021-32842,請將受影響套件升級到下列已修補版本。

• —升級至 1.3.3 或更新版本

CVE-2021-32842 正在被利用嗎?

低 — EPSS 為 0.9%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• >= 1.0.0, < 1.3.3

CVSS 分數

參考連結(4)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-32842
• ADVISORYsecuritylab.github.com/advisories/GHSL-2021-125-sharpziplib
• PATCHgithub.com/icsharpcode/SharpZipLib
• WEBgithub.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3