CVE-2004-2277 in aGSM
Summary
by MITRE
Buffer overflow in aGSM Half-Life client allows remote Half-Life servers to cause a denial of service (crash) and possibly execute arbitrary code via a long server response.
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Analysis
by VulDB Data Team • 01/05/2025
The vulnerability identified as CVE-2004-2277 represents a critical buffer overflow flaw within the aGSM Half-Life client implementation that exposes systems to remote exploitation. This issue affects the popular Half-Life gaming platform and demonstrates how client-side applications can become vectors for both denial of service attacks and potential code execution. The vulnerability stems from inadequate input validation within the client's response handling mechanism, where the application fails to properly sanitize server responses before processing them. When a malicious Half-Life server sends an oversized response packet, the client's buffer handling routines overflow, leading to unpredictable behavior including application crashes or system instability.
The technical nature of this flaw places it within the purview of CWE-121, which categorizes buffer overflow conditions that occur when insufficient space is allocated for data storage. This vulnerability specifically manifests as a stack-based buffer overflow, where the excessive data overflows the allocated memory space and corrupts adjacent memory regions. The attack vector operates through network communication, requiring no local privileges or authentication, making it particularly dangerous in multiplayer gaming environments where users might unknowingly connect to compromised servers. The exploitability of this vulnerability is enhanced by the fact that Half-Life clients typically run with elevated privileges during gameplay, potentially allowing attackers to execute arbitrary code with the same permissions as the victim's account.
From an operational perspective, this vulnerability creates significant risks for both individual gamers and gaming infrastructure providers. The denial of service aspect can disrupt gameplay sessions and potentially impact gaming communities that rely on stable server connections. More critically, the possibility of arbitrary code execution opens pathways for attackers to compromise entire gaming systems, potentially leading to data theft, system control, or further network infiltration. The impact extends beyond simple gaming disruption as compromised client systems could serve as launching points for broader attacks within local networks. This vulnerability particularly affects environments where gaming clients are used in corporate or educational settings, where security policies might not adequately protect against such client-side exploits.
Mitigation strategies for CVE-2004-2277 should include immediate patching of affected aGSM client implementations and network-level filtering to prevent unauthorized server connections. Organizations should implement network segmentation to isolate gaming traffic and employ intrusion detection systems that can identify unusual server response patterns. The ATT&CK framework categorizes this type of vulnerability under T1203, which covers exploitation of remote services, and T1059, which covers command and control through execution. System administrators should also consider implementing application whitelisting policies to prevent unauthorized client modifications and ensure that only trusted versions of the Half-Life client are executed. Regular security assessments and vulnerability scanning should be conducted to identify similar buffer overflow conditions in other gaming applications and network protocols. Additionally, users should be educated about the risks of connecting to untrusted gaming servers and the importance of maintaining updated client software versions to protect against known vulnerabilities.