CMU SNMP utilities snmptrad Format String Vulnerability


Digital Armaments advisory is 01.04.2006
http://www.digitalarmaments.com/2006040164883273.html

I. Background

The package is CMU-SNMP utilities. In this package snmptrapd is an SNMP application that receives and logs SNMP TRAP and INFORM messages. This daemon by default is to listen on UDP port 162 on all IPv4 interfaces. Since 162 is a privileged port, snmptrapd must typically be run as root. 
For many information or detail about the software you can refer to the vendor's homepage:

http://www.gaertner.de/snmp/

II. Problem Description

There is a format string vulnerability in the snmptrapd server from the cmu-snmp package. The vulnerability persist in the snmp_input() function. An attacker could abuse this vulnerability from remote while sending specially crafted packets. Successful exploitation consist in arbitrary code execution, with root privileges by default.

III. Detection

This problem has been detected and tested on latest versions:
snmptrapd from cmu-snmp-linux-3.7 package
snmptrapd from cmu-snmp-linux-3.6 package

IV. Impact analysis

Successful exploitation allow an attacker to gain access to the system with the root privileges (by default). Exploit code is required.

V. Solution

The vendor has given no response.
First notification 12.22.2005.
Second notification 01.09.2006.
No new version will be available.

VI. Credit

Seregorn - seregon@bughunter.net is credited with this discovery.

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VII. Legal Notices

Copyright © 2005 Digital Armaments LLC. 

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