CVE-2005-2764 in OpenTTD
Summary
by MITRE
Multiple buffer overflows in OpenTTD before 0.4.0.1 allow attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 07/06/2021
The vulnerability identified as CVE-2005-2764 represents a critical security flaw in the OpenTTD game server software prior to version 0.4.0.1. This issue manifests as multiple buffer overflows that can be exploited by remote attackers to compromise system integrity and availability. The vulnerability affects the core networking and data processing components of the OpenTTD server implementation, making it particularly dangerous in multiplayer gaming environments where multiple clients connect to a central server. Buffer overflows of this nature typically occur when programs write more data to a fixed-length buffer than it can accommodate, potentially overwriting adjacent memory locations and corrupting program execution flow.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within the OpenTTD server codebase. Attackers can craft malicious network packets or game data that, when processed by the vulnerable server, triggers buffer overflow conditions in memory buffers allocated for handling client communications, game state updates, or network protocol parsing. These buffer overflows can result in stack corruption, heap corruption, or memory pointer overwrites that cause unpredictable behavior. The unspecified vectors mentioned in the description suggest that multiple attack surfaces within the server implementation are susceptible to this class of vulnerability, including but not limited to packet handling, configuration parsing, or data serialization routines. According to the CWE catalog, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which covers stack-based buffer overflow scenarios. The attack surface aligns with ATT&CK technique T1499.004, which involves network denial of service attacks that can be achieved through memory corruption exploits.
The operational impact of CVE-2005-2764 extends beyond simple denial of service conditions to potentially enable remote code execution capabilities. When exploited successfully, these buffer overflows can allow attackers to inject and execute arbitrary code on the target server system with the privileges of the running OpenTTD process. This compromise can lead to complete server takeover, enabling attackers to manipulate game state, steal player data, or use the compromised server as a launch point for further attacks against connected clients or network infrastructure. The vulnerability particularly affects multiplayer gaming environments where OpenTTD servers are commonly deployed, making it a significant concern for game administrators and network security teams managing these systems. The potential for remote code execution places this vulnerability in the high-risk category according to standard security frameworks, as it can be exploited without requiring local system access or user interaction.
Mitigation strategies for this vulnerability require immediate patching of affected OpenTTD installations to version 0.4.0.1 or later, which contains the necessary memory management fixes and input validation improvements. System administrators should implement network segmentation and access controls to limit exposure of OpenTTD servers to untrusted networks. Additional defensive measures include implementing intrusion detection systems to monitor for suspicious network traffic patterns that might indicate exploitation attempts, and establishing regular security audits of gaming server configurations. The vulnerability demonstrates the importance of input validation and memory safety practices in server applications, particularly those handling untrusted network data. Organizations should also consider implementing application whitelisting and runtime protection mechanisms to prevent exploitation of similar buffer overflow vulnerabilities in other software components. The fix implemented in version 0.4.0.1 likely includes proper bounds checking, memory allocation validation, and input sanitization routines that prevent the overflow conditions from occurring during normal operation.