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Xlockmore: Denial of Service


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 201309-03 / Xlockmore
Release Date September 02, 2013
Latest Revision September 02, 2013: 1
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
x11-misc/xlockmore < 5.43 >= 5.43 All supported architectures

Related bugreports: #255229, #440776, #477328


A buffer overflow in Xlockmore might allow remote attackers to cause a Denial of Service.

2.  Impact Information


Xlockmore is just another screensaver application for X.


A Denial of Service flaw was found in the way Xlockmore performed the passing of arguments to the underlying localtime() call, when the ‘dlock’ mode was used.


A local attacker could possibly cause a Denial of Service condition and potentially obtain unauthorized access to the graphical session, previously locked by another user.

3.  Resolution Information


There is no known workaround at this time.


All Xlockmore users should upgrade to the latest version:

Code Listing 3.1: Resolution

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=x11-misc/xlockmore-5.43"

4.  References


Page updated September 02, 2013

Summary: This is a Gentoo Linux Security Advisory

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