CVE-2021-32841 Path Traversal in SharpZipLib

2022-01-2621:10:15

CWE-22

GitHub_M

www.cve.org

sharpziplib

path traversal

cve-2021-32841

destination directory

file creation

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

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

EPSS

0.001

Percentile

46.8%

JSON

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.

CNA Affected

[
  {
    "product": "sharpziplib",
    "vendor": "icsharpcode",
    "versions": [
      {
        "lessThan": "1.3.3",
        "status": "affected",
        "version": "1.3.3",
        "versionType": "custom"
      },
      {
        "lessThan": "1.3.0*",
        "status": "affected",
        "version": "1.3.0",
        "versionType": "custom"
      }
    ]
  }
]