full-disclosure - GSC Voice Server Denial of Service Vulnerability

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Message-ID: <007b01cc7e91$ad919a20$08b4ce60$@gmail.com>
Date: Thu, 29 Sep 2011 03:22:21 -0700
From: "Michael J. Gray" <mooseous@...il.com>
To: <full-disclosure@...ts.grok.org.uk>
Subject: GSC Voice Server Denial of Service Vulnerability

Product: GSC (Game Servers Client)

Version: 2.00 Build 3017

Website: http://getgsc.com

By inspecting the network traffic of messages to voice servers one can see
that ASCII strings are prefixed with their length as a 32-bit signed
integer. Simply modifying this to any length in excess of the actual
string's length will cause a denial of service to that voice server by
crashing it. This may be a precursor to a buffer overflow vulnerability, but
it appears not to be exploitable in this way at this time. 

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