A vulnerability has been discovered in xar, which can lead to privilege escalation.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| app-arch/xar | * | < 1.8.0.0.487.100.1 | >= 1.8.0.0.487.100.1 |
xar provides an easily extensible archive format.
A vulnerability has been discovered in xar. Please review the CVE identifier referenced below for details.
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.
There is no known workaround at this time.
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"