libwmf: User-assisted execution of arbitrary code

Background

libwmf is a library for converting WMF files.

Description

The embedded fork of the GD library introduced a “use-after-free” vulnerability in a modification which is specific to libwmf.

Impact

A remote attacker could entice a user to open a specially crafted WMF file, possibly resulting in the execution of arbitrary code with the privileges of the user running the application, or a Denial of Service.

Workaround

There is no known workaround at this time.

Resolution

All libwmf users should upgrade to the latest version which no longer builds the GD library:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=media-libs/libwmf-0.2.8.4-r3"