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             AUSCERT External Security Bulletin Redistribution

                          ESB-2008.0448 -- [Win]
                  Unauthenticated Stack Overflow in SNMPc
                                1 May 2008


        AusCERT Security Bulletin Summary

Product:              Castle Rock Computing SNMPc Network Manager
Publisher:            NGSSoftware
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated

Original Bulletin:  

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Name: Unauthenticated Stack Overflow in SNMPc
Release Date: 30 April 2008
Reference: NGS00526
Discover: Wade Alcorn <wade@ngssoftware.com> and John Heasman 
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
+44(0)208 401 0070

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