GLSA 202405-19: xar: Unsafe Extraction
| Severity: | normal |
| Title: | xar: Unsafe Extraction |
| Date: | 05/07/2024 |
| Bugs: | |
| ID: | 202405-19 |
Synopsis
A vulnerability has been discovered in xar, which can lead to privilege escalation.Background
xar provides an easily extensible archive format.
Affected packages
| Package | Vulnerable | Unaffected | Architecture(s) |
|---|---|---|---|
| app-arch/xar | < 1.8.0.0.487.100.1 | >= 1.8.0.0.487.100.1 | All supported architectures |
Description
A vulnerability has been discovered in xar. Please review the CVE identifier referenced below for details.
Impact
xar allows for a forward-slash separated path to be specified in the file name property, e.g. <name>x/foo</name> – as long as it doesn’t traverse upwards, and the path exists within the current directory. This means an attacker can create a .xar file which contains both a directory symlink, and a file with a name property which points into the extracted symlink directory. By abusing symlink directories in this manner, an attacker can write arbitrary files to any directory on the filesystem – providing the user has permissions to write to it.
Workaround
There is no known workaround at this time.
Resolution
All xar users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/xar-1.8.0.0.487.100.1"
References
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
Concerns?
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
License
Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.