CVE-2004-2592 in Quake II Server
Summary
by MITRE
Quake II server before R1Q2, as used in multiple products, allows remote attackers cause a denial of service (application crash) via a modified client that asks the server to send data stored at a negative array offset, which is not handled when processing Configstrings and Baselines.
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Analysis
by VulDB Data Team • 01/10/2025
The vulnerability identified as CVE-2004-2592 represents a classic buffer overread condition affecting the Quake II server implementation across multiple products. This flaw manifests in the server's handling of client communication protocols where malicious clients can exploit improper bounds checking during the processing of configuration strings and baselines. The vulnerability specifically targets the server's memory management routines when it attempts to access data structures using negative array offsets, which are not properly validated or sanitized by the server implementation.
The technical exploitation of this vulnerability occurs when a modified client establishes connection to a Quake II server and deliberately sends malformed configuration data that references memory locations at negative offsets. This type of memory access pattern violates fundamental security principles and can lead to unpredictable behavior including application crashes, memory corruption, or potentially more severe consequences depending on the underlying implementation. The issue stems from inadequate input validation and boundary checking mechanisms within the server's network protocol handling code, which fails to properly validate array indices before accessing memory locations.
From an operational perspective, this vulnerability creates a significant denial of service risk for Quake II server deployments across various gaming platforms and network environments. Attackers can reliably crash servers by connecting with modified clients, disrupting gameplay for legitimate users and potentially causing service interruptions for gaming communities. The impact extends beyond simple service disruption as it can affect server availability for extended periods, particularly in environments where server restarts are not automated or where administrators lack immediate response capabilities. This vulnerability particularly affects older Quake II server implementations before R1Q2 version, making it a persistent threat in legacy gaming infrastructure.
The vulnerability aligns with CWE-129, which addresses improper validation of array indices, and demonstrates characteristics consistent with the ATT&CK technique T1499.004 for network denial of service attacks. Organizations should implement immediate mitigations including updating to patched versions of Quake II servers, implementing network-level filtering to detect and block malformed client connections, and establishing robust monitoring for unusual connection patterns or crash events. Additionally, network administrators should consider implementing rate limiting and connection validation mechanisms to prevent exploitation while maintaining service availability for legitimate users. The remediation process requires careful attention to ensure that all affected server installations are updated and that proper input validation is enforced across all network communication pathways to prevent similar vulnerabilities from emerging in future implementations.