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Critical Vulnerability in SNMPc
From: NGSSoftware Insight Security Research <nisr () ngssoftware com>
Date: Wed, 30 Apr 2008 21:46:02 +1000

Name: Unauthenticated Stack Overflow in SNMPc
Release Date: 30 April 2008
Reference: NGS00526
Discover: Wade Alcorn <wade () ngssoftware com> and John Heasman <john () ngssoftware com>
Vendor: Castle Rock Computing
Systems Affected: SNMPc versions 7.1 and earlier
Risk: Critical
Status: Published

Wade Alcorn and John Heasman of NGSSoftware have discovered a stack overflow vulnerability in Castle Rock Computing SNMPc Network Manager. SNMPc Network Manger is a distributed network management system that allows monitoring of the network infrastructure. It employs a distributed polling agent architecture which uses SNMP TRAPs to provide a solution capable of monitoring networks with up to ten thousand devices. An SNMP TRAP initiated by a network element is sent to the SNMPc Network Manager to allow monitoring of the infrastructure.

Technical Details
The vulnerability can be exploited when an overly long community string is sent in the SNMP TRAP packet. The packets format will be valid ASN.1, including the length of the community string. An attacker can craft a single UDP packet that can lead to the execution of arbitrary code in the context of LocalSystem.

Fix Information
NGSSoftware wish to note that Castle Rock Computing were extremely pro-active in addressing this issue.

The latest version (SNMPc 7.1.1) can be downloaded from the Castle Rock Computing website: http://www.castlerock.com/.

NGSSoftware Insight Security Research
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