CVE-2016-9400 in Teeworlds
Summary
by MITRE
The CClient::ProcessServerPacket method in engine/client/client.cpp in Teeworlds before 0.6.4 allows remote servers to write to arbitrary physical memory locations and possibly execute arbitrary code via vectors involving snap handling.
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Analysis
by VulDB Data Team • 09/17/2024
The vulnerability identified as CVE-2016-9400 represents a critical memory corruption flaw within the Teeworlds multiplayer gaming engine that affects versions prior to 0.6.4. This vulnerability exists within the CClient::ProcessServerPacket method located in engine/client/client.cpp, which handles packet processing from game servers to client instances. The issue stems from inadequate input validation and memory management during the handling of network snapshots, which are essential components for synchronizing game state between servers and clients in real-time multiplayer environments.
The technical flaw manifests when a remote malicious server sends specially crafted packets that exploit a buffer overflow condition during snap handling operations. This allows the attacker to write data to arbitrary physical memory locations beyond the intended buffer boundaries. The vulnerability operates at a low level within the client application's memory management system, where the snap processing mechanism fails to properly validate the size and content of incoming data structures. This misconfiguration creates a path for memory corruption that can be leveraged to execute arbitrary code on the victim's machine, effectively providing remote code execution capabilities.
The operational impact of this vulnerability extends beyond simple game disruption as it represents a severe security risk for players who may unknowingly connect to compromised servers. Attackers can exploit this vulnerability to gain full control over affected systems, potentially leading to data theft, system compromise, or use as a pivot point for further attacks within a network. The vulnerability affects the core client-server communication model of Teeworlds, making it particularly dangerous as any player connecting to a malicious server could be compromised. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, which is classified as a critical security weakness in software systems.
The exploitation of this vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation would enable attackers to execute arbitrary code with the privileges of the affected user. The vulnerability's impact is amplified by the nature of online gaming environments where users frequently connect to untrusted servers and the automated nature of packet processing that occurs during gameplay. Network-based attacks targeting this vulnerability can be executed without requiring any special privileges from the attacker, making it particularly dangerous in public gaming environments. The lack of proper bounds checking during snap handling operations demonstrates a failure in implementing secure coding practices that are fundamental to preventing memory corruption vulnerabilities.
Mitigation strategies for this vulnerability primarily involve updating to Teeworlds version 0.6.4 or later, which includes proper bounds checking and memory validation in the snap handling mechanism. System administrators and users should implement network monitoring to detect suspicious server connections and consider using trusted server lists to prevent connections to unverified game servers. Additional defensive measures include network segmentation to limit exposure, implementing firewall rules to restrict game server connections, and maintaining up-to-date security patches for all gaming software components. The vulnerability serves as a reminder of the importance of secure input validation and proper memory management in networked applications, particularly those handling real-time data synchronization in gaming environments.