Debian DSA-2979-1 Fail2Ban Critical: Input Validation Denial Of Service

Two vulnerabilities were discovered in Fail2ban, a solution to ban hosts
that cause multiple authentication errors. When using Fail2ban to monitor
Postfix or Cyrus IMAP logs, improper input validation in log parsing
could enable a remote attacker to trigger an IP ban on arbitrary
addresses, resulting in denial of service.

For the stable distribution (wheezy), these problems have been fixed in
version 0.8.6-3wheezy3.

For the testing distribution (jessie), these problems have been fixed in
version 0.8.11-1.

For the unstable distribution (sid), these problems have been fixed in
version 0.8.11-1.

We recommend that you upgrade your fail2ban packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/