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Vixie cron: Denial of Service

Content:

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

Synopsis

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

2.  Impact Information

Background

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

Description

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

Impact

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

Workaround

There is no known workaround at this time.

Resolution

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



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Page updated November 07, 2013

Summary: This is a Gentoo Linux Security Advisory

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