Arbitrary File Write via Archive Extraction (Zip Slip) Affecting ssziparchive package, versions <2.5.4
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Test your applications- Snyk ID SNYK-COCOAPODS-SSZIPARCHIVE-3225821
- published 5 Jan 2023
- disclosed 5 Jan 2023
- credit Lander Brandt
Introduced: 5 Jan 2023
CVE-2022-36943 Open this link in a new tabHow 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