SECUNIA ADVISORY ID: SA23236

VERIFY ADVISORY: http://secunia.com/advisories/23236/

CRITICAL: Moderately critical

IMPACT: DoS

SOFTWARE: DenyHosts 2.x - http://secunia.com/product/12830/

DESCRIPTION: Tavis Ormandy has discovered a vulnerability in DenyHosts, which can be exploited by malicious people to cause a DoS (Denial of Service). The vulnerability is caused due to an error in the parsing of log files before adding an entry in /etc/hosts.deny. This can be exploited to add arbitrary IP addresses to /etc/hosts.deny resulting in a DoS for that IP. The vulnerability is confirmed in version 2.5. Other versions may also be affected.

SOLUTION: Use another product.

PROVIDED AND/OR DISCOVERED BY: Tavis Ormandy

ORIGINAL ADVISORY: http://bugs.gentoo.org/show_bug.cgi?id=157163