Arbitrary Command Execution

Affecting pyxdg package, versions [,0.26)

Overview

pyxdg contains implementations of freedesktop.org standards in python.

Affected versions of this package are vulnerable to Arbitrary Command Execution via the xdg.Menu.parse() function. When it is possible to craft an evil menu file with a Category node containing Python injected code. Then it is possible to update xdg_config_dirs with its location folder, the evil menu can be parsed and an attacker could exploit the vulnerability. This is due to a lack of sanitization in xdg/Menu.py. When the evil menu file is parsed, the injected code is executed because of an unsanitized eval().

Remediation

Upgrade pyxdg to version 0.26 or higher.

References

• GitHub Vulnerable Code

• Proof Of Concept