Cisco Security Advisory: GNU Bash Environmental Variable Command Injection Vulnerability

[Cisco Systems Product Security Incident Response Team <psirt@xxxxxxxxx>]

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GNU Bash Environmental Variable Command Injection Vulnerability

Advisory ID: cisco-sa-20140926-bash

Revision 1.0

For Public Release 2014 September 26 01:00  UTC (GMT)

Summary
+======

On September 24, 2014, a vulnerability in the Bash shell was publicly 
announced. The vulnerability is related to the way in which shell functions are 
passed though environment variables. The vulnerability may allow an attacker to 
inject commands into a Bash shell, depending on how the shell is invoked. The 
Bash shell may be invoked by a number of processes including, but not limited 
to, telnet, SSH, DHCP, and scripts hosted on web servers.

All versions of GNU Bash starting with version 1.14 are affected by this 
vulnerability and the specific impact is determined by the characteristics of 
the process using the Bash shell. In the worst case, an unauthenticated remote 
attacker would be able to execute commands on an affected server. However, in 
most cases involving Cisco products, exploitation of the vulnerability results 
in an authenticated attacker having the ability to execute commands for which 
they are not authorized.

A number of Cisco products ship with or leverage an affected version of the 
Bash shell. 

This advisory will be updated as additional information becomes available. 

Cisco may release free software updates that address this vulnerability if a 
product is determined to be affected by this vulnerability. 

This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140926-bash


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