The Channel logo


By | John Leyden 8th September 2005 11:23

Cisco warns over serious authentication bug

Who goes there?

Cisco has warned of a vulnerability in its IOS Firewall Authentication Proxy which might be used by hackers to launch denial of service attacks against vulnerable systems. The vulnerability stems from a software bug in processing user authentication credentials which might be exploited to cause a buffer overflow.

Successful attacks can cause an affected device to reload and might even allow arbitrary code execution provided a vulnerable Authentication Proxy is configured to handle either FTP or Telnet Sessions. Devices that do not support, or are not configured for Firewall Authentication Proxy for either FTP or Telnet Services are not affected.

The vulnerability applies to various versions of Cisco IOS 12.x. An advisory from Cisco provides a matrix explaining how users can get software updates to guard against possible attack. A US-CERT advisory gives a more concise overview of the problem which security notification firm Secunia rates as moderately critical. ®

alert Send corrections


Frank Jennings

What do you do? Use manual typwriters or live in a Scottish croft? Our man advises
A rusty petrol pump at an abandoned gas station. Pic by Silvia B. Jakiello via shutterstock

Trevor Pott

Among other things, Active Directory needs an overhaul
Baby looks taken aback/shocked/affronted. Photo by Shutterstock

Kat Hall

Plans for 2 million FTTP connections in next four years 'not enough'
Microsoft CEO Satya Nadella


League of gentlemen poster - Tubbs and Edward at the local shop. Copyright BBC
One reselling man tells his tale of woe