Title: Half-Life Client Server Message Format String Vulnerability
Severity: CRITICAL
Description:
The Half-Life client is a component of the Half-Life game distributed by Valve Software. It is available for Microsoft Windows operating systems.
A problem in the Half-Life client could allow remote users to execute arbitrary code on a vulnerable host.
It has been reported that the Half-Life client contains a format string vulnerability. When receiving messages from an administrator through the rcon remote administration console, the client does not properly handle input. This could result in denial of service, or code execution.
The problem is in the handling of messages sent through the csay or psay commands on a standard server, or the admin_ssay and admin_psay commands when adminmod is used. The Half-Life client does not properly handle these commands, making it possible to launch an exploitable format string attack on the clients. This may permit an attacker to corrupt arbitrary locations in memory with attacker-supplied values. Any code executed on the vulnerable clients would be with the privileges of the user of the Half-Life client.
Affected Products:
- Valve Software Half-Life 1.1.0.0.8
- Valve Software Half-Life 1.1.0.0.9
- Valve Software Half-Life 1.1.1.0
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