CMU SNMP utilities snmptrad Format String Vulnerability - Digital Armaments for Intelligence

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Digital Armaments advisory is 01.04.2006

I. Background

The package is CMU-SNMP utilities. In the package snmptrapd is an SNMP application that receives and logs SNMP TRAP and INFORM messages. The daemon by default is to be listens on UDP port 162 on all IPv4 interfaces. Since 162 is a privileged port, snmptrapd must typically be run as root.
For further 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 persists in the snmp_input() function. An attacker could abuse this vulnerability from remote while sending specially crafted packets. Successful exploitation consists of 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 allows an attacker to gain access to the system with the root privileges (by default). Exploit code is required.

V. Solution

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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