CVE-2004-2593 in Quake II Server
Summary
by MITRE
Buffer overflow in command-packet processing of Quake II server before R1Q2, as used in multiple products, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a packet with a long cmd_args buffer.
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Analysis
by VulDB Data Team • 03/25/2019
The vulnerability described in CVE-2004-2593 represents a critical buffer overflow flaw within the command-packet processing mechanism of Quake II server software prior to the R1Q2 release. This vulnerability affects multiple products that utilize the Quake II server infrastructure, making it a widespread concern for gaming networks and server administrators. The flaw specifically manifests during the handling of command arguments within network packets, where insufficient input validation allows malicious actors to exploit the system's memory management.
The technical implementation of this vulnerability stems from inadequate bounds checking during packet processing operations. When the Quake II server receives network packets containing command arguments, it fails to properly validate the length of the cmd_args buffer before copying data into fixed-size memory locations. This classic buffer overflow condition occurs because the server allocates a predetermined amount of memory for command arguments without sufficient verification of incoming data length. The flaw aligns with CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability operates at the network protocol level, making it particularly dangerous as it can be exploited remotely without requiring local system access or authentication.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable remote code execution. When exploited successfully, attackers can cause the Quake II server to crash and potentially gain control over the system running the server software. The crash scenario represents a straightforward denial of service attack that disrupts gaming services and network availability. However, the possibility of arbitrary code execution introduces a more severe threat vector where malicious actors could install backdoors, modify game data, or use the compromised server as a launch point for attacks on other network resources. This vulnerability directly impacts the integrity and availability of gaming services that depend on Quake II server infrastructure.
Security professionals should implement immediate mitigations including applying the latest patches released by id Software and other affected vendors to address the buffer overflow condition. Network segmentation and firewall rules can help limit exposure by restricting access to Quake II server ports and implementing rate limiting for incoming packets. Additionally, monitoring network traffic for unusual packet patterns and implementing intrusion detection systems can help identify exploitation attempts. The vulnerability demonstrates the importance of input validation and proper memory management in network services, aligning with ATT&CK technique T1203 which covers legitimate user privileges to establish persistence. Organizations should also consider implementing application whitelisting policies and regular security audits to prevent similar vulnerabilities in other legacy systems that may share similar architectural flaws. The remediation process must include thorough testing of patches to ensure they do not introduce compatibility issues with existing game configurations or network protocols.