Gentoo Logo

Vixie cron: Denial of Service


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 201311-04 / vixie-cron
Release Date November 07, 2013
Latest Revision November 07, 2013: 1
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
sys-process/vixie-cron < 4.1-r14 >= 4.1-r14 All supported architectures

Related bugreports: #308055


A vulnerability has been found in Vixie cron, allowing local attackers to conduct symlink attacks.

2.  Impact Information


Paul Vixie’s cron daemon, a fully featured crond implementation.


Vixie cron contains a race condition relating to atime and mtime values of temporary files.


A local attacker could change the modification time of files, possibly resulting in a Denial of Service condition via a symlink attack.

3.  Resolution Information


There is no known workaround at this time.


All Vixie cron users should upgrade to the latest version:

Code Listing 3.1: Resolution

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=sys-process/vixie-cron-4.1-r14"

4.  References


Page updated November 07, 2013

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.