rxvt-unicode: User-assisted execution of arbitrary code

Background

rxvt-unicode (urxvt) is a clone of the rxvt terminal emulator.

Description

It was discovered that rxvt-unicode did not properly handle certain escape sequences.

Impact

A remote attacker could entice a user to run a program where attacker controls the output inside a rxvt terminal window, possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All rxvt-unicode users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=x11-terms/rxvt-unicode-9.22-r9"