CVE Vulnerability

CVE-2021-32842

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.

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

5.3 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3 Release Notes Third Party Advisory
https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/ Exploit Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:sharpziplib_project:sharpziplib:*:*:*:*:*:*:*:*
Information

Published : 2022-01-26 09:15

Updated : 2022-02-07 07:09

NVD link : CVE-2021-32842

Mitre link : CVE-2021-32842

Products Affected
No products.
CWE
CWE-22