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Fail2ban: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 201406-03 / fail2ban
Release Date June 01, 2014
Latest Revision June 01, 2014: 1
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-analyzer/fail2ban < 0.8.12 >= 0.8.12 All supported architectures

Related bugreports: #364883, #473118, #499802


Multiple vulnerabilities have been found in Fail2ban, the worst of which allows remote attackers to cause a Denial of Service condition.

2.  Impact Information


Fail2ban is a tool for parsing log files and banning IP addresses which show suspicious behavior.


Multiple vulnerabilities have been discovered in Fail2ban. Please review the CVE identifiers referenced below for details.


A remote attacker could send a crafted URL to a web site which, when parsed by Fail2ban, would deny a specific IP address. Also, errors in regular expressions within certain filters can cause arbitrary IP addresses to be banned. Furthermore, a local attacker could perform symlink attacks to overwrite arbitrary files with the privileges of the user running the application.

3.  Resolution Information


There is no known workaround at this time.


All Fail2ban users should upgrade to the latest version:

Code Listing 3.1: Resolution

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-analyzer/fail2ban-0.8.12

4.  References


Page updated June 01, 2014

Summary: This is a Gentoo Linux Security Advisory

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