[ GLSA 200707-13 ] Fail2ban: Denial of Service

[GLSA]

Gentoo Linux Security Advisory

Title: Fail2ban: Denial of Service (GLSA 200707-13)
Severity: normal
Exploitable: remote
Date: July 28, 2007
Updated: January 09, 2008
Bug(s): #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: net-analyzer/fail2ban
Vulnerable: < 0.8.0-r1
Unaffected: >= 0.8.0-r1
Architectures: 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: