CVE-2007-4532

Vulnerability

CVE-2007-4532 affects Soldat game server versions 1.4.2 and earlier, and dedicated server versions 2.6.2 and earlier, on Windows platforms. The vulnerability lies in the handling of UDP join packets. By sending a series of such packets from a spoofed IP address, an attacker can trigger a temporary blacklisting of that IP on the server [1]. The server implements a mechanism to block IPs that appear to be attempting a connection flood; however, this mechanism can be abused with spoofed source addresses.

Exploitation

The attacker only needs network access to the target server and the ability to send UDP packets with a forged source IP address. No authentication is required. The attack consists of sending a series of UDP join packets that mimic a connection attempt from a target client's IP address. The server incorrectly interprets these as malicious and blacklists that IP for a temporary period, preventing the legitimate client from connecting or joining the game [1]. The attack can be launched from any remote location.

Impact

Successful exploitation results in a denial of service condition: the targeted client (with the spoofed IP) is locked out from the server. This prevents that IP from joining or playing in the game session. The attacker can selectively target clients or disrupt legitimate users' access. Since the blacklist is temporary, the effect is reversible but can be repeated [1]. The server itself does not crash, but service to the targeted IP is denied.

Mitigation

At the time of disclosure, no official patch was available for version 1.4.2 of the game server or version 2.6.2 of the dedicated server. The researcher recommended implementing rate limiting or challenge-response mechanisms for join packets to prevent spoofing [1]. Users are advised to upgrade to a later version if available, or apply network-level filters to restrict UDP packet spoofing. The vulnerability is not listed on CISA's Known Exploited Vulnerabilities (KEV) catalog as of this writing.