J-Security Center

Title: aGSM Half-Life Server Info Response Buffer Overflow Vulnerability

Severity: HIGH

Description:

aGSM is a game server browser utility available for Microsoft Windows platforms.

aGSM is reported prone to a remote buffer overflow vulnerability. The issue presents itself in the aGSM server information parsing routines for Half-Life game servers. Due to a lack of sufficient bounds checking performed on the hostname parameter in a server reply to an info request, a malicious server may execute arbitrary code on an affected client.

It is reported that 66 bytes of data will corrupt memory adjacent to an insufficient buffer. This may allow a remote attacker to corrupt a saved instruction or base 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 aGSM client.

It should be noted that although aGSM version 2.35c is reported prone to this vulnerability, other versions might also be affected.

Affected Products:

  • aGSM aGSM 2.35.0c

References:

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