CVE-2007-4532 in Soldat game server
Summary
by MITRE
Soldat game server 1.4.2 and earlier, and dedicated server 2.6.2 and earlier, allows remote attackers to cause a denial of service (client lockout) via a series of UDP join packets from a spoofed IP address, which triggers temporary blacklisting of this IP address.
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Analysis
by VulDB Data Team • 10/30/2017
The vulnerability identified as CVE-2007-4532 affects Soldat game servers and dedicated servers version 1.4.2 and earlier, as well as dedicated servers version 2.6.2 and earlier. This represents a significant security flaw in the network access control mechanisms of these gaming platforms. The issue stems from the server's insufficient validation of incoming UDP join packets, creating a pathway for malicious actors to exploit the system's IP address blacklisting functionality for denial of service purposes. The vulnerability operates through a spoofed IP address attack vector that leverages the inherent weaknesses in the server's authentication and access control protocols.
The technical implementation of this vulnerability exploits the server's IP address blacklisting mechanism by sending a series of UDP join packets from a spoofed IP address. When the server processes these packets, it temporarily blocks the spoofed IP address from further access attempts, effectively creating a lockout condition for legitimate users who might be utilizing that IP address. This mechanism, designed to prevent abuse from malicious sources, becomes a weapon itself when manipulated by attackers who can systematically block legitimate connections through IP address spoofing. The flaw resides in the server's lack of proper source address verification and the absence of rate limiting or anomaly detection for join packet processing. This issue demonstrates a classic case of inadequate input validation and flawed access control logic.
The operational impact of this vulnerability extends beyond simple service disruption, as it creates a persistent denial of service condition that can affect multiple legitimate users simultaneously. When attackers exploit this vulnerability, they can cause widespread client lockout across the network, preventing legitimate players from accessing the game server. The temporary blacklisting mechanism, which should serve as a protective feature against abuse, becomes a tool for attackers to systematically deny service to legitimate users. This vulnerability particularly affects multiplayer gaming environments where server availability is crucial for user experience and game functionality, potentially leading to significant revenue loss for game operators and degraded user experience for legitimate players.
Mitigation strategies for this vulnerability require implementing robust IP address validation mechanisms and strengthening the server's access control protocols. Network administrators should deploy source address validation techniques that verify the authenticity of incoming packets, preventing spoofed IP addresses from triggering the blacklisting mechanism. Implementing rate limiting for join packet processing can prevent attackers from overwhelming the system with repeated spoofed requests. The solution should also include anomaly detection systems that can identify and flag suspicious patterns of join packet traffic that deviate from normal usage behavior. Organizations should also consider implementing proper logging and monitoring of access control events to detect exploitation attempts. This vulnerability aligns with CWE-284, which addresses improper access control, and represents a variant of the broader class of denial of service attacks that target access control mechanisms. The remediation process should involve updating server software to versions that implement proper IP address validation and enhanced access control protocols, while also establishing network-level protections against spoofed traffic to prevent exploitation attempts.