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fcron: Information disclosure


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 201311-16 / fcron
Release Date November 25, 2013
Latest Revision November 25, 2013: 1
Impact low
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
sys-process/fcron < 3.0.5-r2 >= 3.0.5-r2 All supported architectures

Related bugreports: #308075


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

2.  Impact Information


fcron is a periodic command scheduler for Unix-based systems


The fcrontab function contains a race condition relating to symlinks.


A local attacker could perform symlink attacks to read arbitrary files with the privileges of the user running the application.

3.  Resolution Information


There is no known workaround at this time.


All fcron users should upgrade to the latest version:

Code Listing 3.1: Resolution

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=sys-process/fcron-3.0.5-r2"

4.  References


Page updated November 25, 2013

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