Title: Valve Software Half-Life Client Connection Routine Buffer Overflow Vulnerability
Severity: HIGH
Description:
Half-Life is a game distributed and maintained by Valve Software. It includes features that allow users to game locally or across a network. The game engine is used in many modifications.
Half-Life Client has been reported prone to a remotely exploitable buffer overflow condition.
The issue presents itself in the client connection routine, used by the client to negotiate a connection to the Half-Life game server. Due to a lack of sufficient bounds checking performed on both the parameter and value of data transmitted from the game server to the client, a malicious server may execute arbitrary code on an affected client.
It has been reported that a parameter of 516 bytes and a value of 268, will corrupt data adjacent to an insufficient buffer. This may allow a remote attacker to corrupt a saved instruction pointer and thereby influence program execution flow. Ultimately the attacker may trigger the execution of supplied instructions in the context of the user running the affected game client.
It should be noted that although this vulnerability has been reported to affect
Half-Life version 1.1.1.0, previous versions are likely affected.
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
References:
- Valve Software: Valve Software Homepage
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