CVE-2005-2774 in Lithium II mod
Summary
by MITRE
Format string vulnerability in Lithium II mod 1.24 for Quake 2 allows remote attackers to cause a denial of service (server crash) and possibly execute arbitrary code via format string specifiers in the nickname.
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Analysis
by VulDB Data Team • 03/26/2019
The vulnerability identified as CVE-2005-2774 represents a critical format string flaw within the Lithium II mod version 1.24 for Quake 2 gaming platform. This security weakness specifically targets the client-side nickname handling mechanism, where the mod fails to properly validate user input before processing it through format string functions. The issue stems from the mod's implementation of printf-style functions without adequate sanitization of user-supplied data, creating an exploitable condition that can be leveraged by remote attackers to manipulate the game server's execution flow.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious nickname containing format string specifiers such as %x, %s, or %n characters. These specifiers, when processed by the vulnerable printf function, can cause the server to read from or write to memory locations that should remain protected. The attack vector is particularly dangerous because it can be executed remotely without requiring any authentication or special privileges, making it accessible to anyone capable of connecting to the affected Quake 2 server. This vulnerability directly maps to CWE-134, which specifically addresses the use of user-supplied format strings in printf-style functions without proper validation or sanitization.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable arbitrary code execution on the affected server. When exploited successfully, attackers can cause the game server to crash and restart, disrupting gameplay for all connected users. More critically, the format string vulnerability can be leveraged to read sensitive memory contents, potentially exposing server configurations, user credentials, or other confidential information. The vulnerability also creates opportunities for privilege escalation attacks where malicious actors could gain unauthorized control over the server environment, making it a serious concern for game administrators and network security professionals. This type of vulnerability aligns with ATT&CK technique T1203, which covers legitimate program execution through manipulation of program execution flow.
Mitigation strategies for CVE-2005-2774 require immediate action from system administrators and game server operators. The most effective solution involves updating to a patched version of the Lithium II mod that properly validates and sanitizes all user input before processing it through format string functions. Organizations should implement input validation measures that strip or escape potentially dangerous characters from nickname fields, particularly format specifiers that could be used for exploitation. Network-level defenses such as firewall rules and intrusion detection systems can help monitor for suspicious connection patterns, though these measures are secondary to proper code-level fixes. Additionally, server administrators should consider implementing rate limiting and connection validation mechanisms to reduce the effectiveness of automated exploitation attempts. The vulnerability serves as a reminder of the importance of secure coding practices and proper input validation in networked applications, particularly those handling user-supplied data in gaming environments where remote code execution risks are particularly high.