Gentoo Logo

ktsuss: Privilege escalation


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 201201-15 / ktsuss
Release Date January 27, 2012
Latest Revision January 27, 2012: 1
Impact high
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
x11-misc/ktsuss <= 1.4 All supported architectures

Related bugreports: #381115


Two vulnerabilities have been found in ktsuss, allowing local attackers to gain escalated privileges.

2.  Impact Information


ktsuss is a simple, graphical version of su written in C and GTK+.


Two vulnerabilities have been found in ktuss:

  • Under specific circumstances, ktsuss skips authentication and fails to change the effective UID back to the real UID (CVE-2011-2921).
  • The GTK interface spawned by the ktsuss binary is run as root (CVE-2011-2922).


A local attacker could gain escalated privileges and use the "GTK_MODULES" environment variable to possibly execute arbitrary code with root privileges.

3.  Resolution Information


There is no known workaround at this time.


Gentoo discontinued support for ktsuss. We recommend that users unmerge ktsuss:

Code Listing 3.1: Resolution

  # emerge --unmerge "x11-misc/ktsuss"

4.  References


Page updated January 27, 2012

Summary: This is a Gentoo Linux Security Advisory

Security Team
Contact Address

Donate to support our development efforts.

Copyright 2001-2015 Gentoo Foundation, Inc. Questions, Comments? Contact us.