Arbitrary File Write via Archive Extraction (Zip Slip) Affecting ssziparchive package, versions <2.5.4


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.09% (41st percentile)

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  • Snyk IDSNYK-COCOAPODS-SSZIPARCHIVE-3225821
  • published5 Jan 2023
  • disclosed5 Jan 2023
  • creditLander Brandt

Introduced: 5 Jan 2023

CVE-2022-36943  (opens in a new tab)
CWE-29  (opens in a new tab)

How to fix?

Upgrade SSZipArchive to version 2.5.4 or higher.

Overview

SSZipArchive is a simple utility class for zipping and unzipping files on iOS, macOS and tvOS.

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) via paths involving symlinks. An attacker can overwrite files on the filesystem when opening a malicious ZIP containing a symlink as the first item.

Details

It is exploited using a specially crafted zip archive, that holds path traversal filenames. When exploited, a filename in a malicious archive is concatenated to the target extraction directory, which results in the final path ending up outside of the target folder. For instance, a zip may hold a file with a "../../file.exe" location and thus break out of the target folder. If an executable or a configuration file is overwritten with a file containing malicious code, the problem can turn into an arbitrary code execution issue quite easily.

The following is an example of a zip archive with one benign file and one malicious file. Extracting the malicous file will result in traversing out of the target folder, ending up in /root/.ssh/ overwriting the authorized_keys file:


+2018-04-15 22:04:29 ..... 19 19 good.txt

+2018-04-15 22:04:42 ..... 20 20 ../../../../../../root/.ssh/authorized_keys

References

CVSS Scores

version 3.1