GLSA 200707-13: Fail2ban: Denial of Service

http://security.gentoo.org/

Severity:	normal
Title:	Fail2ban: Denial of Service
Date:	07/28/2007
Bugs:	#181214
ID:	200707-13

Synopsis

Fail2ban is vulnerable to a Denial of Service attack.

Background

Fail2ban is a tool for parsing log files and banning IP addresses which make too many password failures.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-analyzer/fail2ban	< 0.8.0-r1	>= 0.8.0-r1	All supported architectures

Description

A vulnerability has been discovered in Fail2ban when parsing log files.

Impact

A remote attacker could send specially crafted SSH login banners to the vulnerable host, which would prevent any ssh connection to the host and result in a Denial of Service.

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-0.8.0-r1"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200707-13.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.