CVE-2008-3396 in Unreal Tournament 2004
Summary
by MITRE
Unreal Tournament 2004 (UT2004) 3369 and earlier allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a certain sequence of malformed packets.
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Analysis
by VulDB Data Team • 01/20/2025
The vulnerability identified as CVE-2008-3396 affects Unreal Tournament 2004 version 3369 and earlier, representing a critical denial of service weakness that can be exploited remotely by attackers. This issue stems from inadequate input validation within the game's network protocol implementation, specifically when processing certain sequences of malformed network packets. The flaw manifests as a NULL pointer dereference condition that occurs during packet processing, leading to an immediate daemon crash and complete service unavailability for legitimate players. The vulnerability is particularly concerning because it does not require authentication or special privileges to exploit, making it accessible to any remote attacker with network access to the game server.
From a technical perspective, the vulnerability operates through a classic buffer over-read or invalid memory access pattern where the UT2004 game engine fails to properly validate incoming packet structures before attempting to dereference pointers within those packets. When malformed packets containing unexpected data sequences are received, the game's network handler routine attempts to access memory locations that have not been properly initialized or allocated, resulting in a NULL pointer dereference. This type of vulnerability is classified under CWE-476 as NULL Pointer Dereference, which represents a fundamental programming error where a program attempts to access memory through a null pointer reference. The daemon crash occurs because the operating system terminates the process when it encounters this unhandled memory access violation, effectively taking the game server offline.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be leveraged by malicious actors to maintain persistent denial of service conditions against game servers. Attackers can repeatedly send these malformed packets to keep servers in a constant state of crash and restart, creating a denial of service scenario that can severely impact player experience and server availability. The vulnerability affects the core network communication layer of the Unreal Tournament 2004 engine, which means that any server running affected versions becomes immediately vulnerable to this type of attack. This issue particularly impacts competitive gaming environments where server uptime is critical for tournaments and regular gameplay sessions, as the vulnerability can be exploited to disrupt matches or prevent legitimate players from accessing servers.
Mitigation strategies for CVE-2008-3396 should include immediate patching of the UT2004 engine to version 3370 or later, which contains the necessary fixes for the NULL pointer dereference issue. Network administrators should implement packet filtering rules to detect and block malformed packets that match the vulnerable sequence patterns, though this approach provides only partial protection as the attack can be easily evaded. The most effective solution involves updating to the patched version of the game engine, which addresses the root cause by implementing proper input validation and memory access checks. Additionally, system administrators should consider implementing intrusion detection systems that can monitor for unusual packet patterns and automatically isolate affected servers until proper patches are applied. From an ATT&CK framework perspective, this vulnerability aligns with T1499.004 for Network Denial of Service and T1595.001 for Network Device Discovery, as it enables attackers to disrupt network services and potentially gather information about vulnerable systems. The vulnerability also demonstrates the importance of input validation practices that align with secure coding standards and defense-in-depth strategies to protect gaming infrastructure from similar threats.