GLSA 200702-05: Fail2ban: Denial of Service

http://security.gentoo.org/

Severity:	normal
Title:	Fail2ban: Denial of Service
Date:	02/16/2007
Bugs:	#157166
ID:	200702-05

Synopsis

A flaw in Fail2ban may allow remote attackers to deny access to arbitrary hosts.

Background

Fail2ban monitors log files for failed authentication attempts and can block hosts responsible for repeated attacks.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-analyzer/fail2ban	< 0.6.2	>= 0.6.2	All supported architectures

Description

A flaw in the method used to parse log entries allows remote, unauthenticated attackers to forge authentication attempts from other hosts.

Impact

A remote attacker can add arbitrary hosts to the block list, denying legitimate users access to a resource.

Workaround

There is no known workaround at this time.

Resolution

All Fail2ban users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-analyzer/fail2ban-0.6.2"

References

CVE-2006-6302

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200702-05.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.