CVE-2005-4584 in BZFlag server
Summary
by MITRE
BZFlag server 2.0.4 and earlier allows remote attackers to cause a denial of service (application crash) via a callsign that is not followed by a NULL (\0) character.
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Analysis
by VulDB Data Team • 01/18/2025
The vulnerability identified as CVE-2005-4584 affects BZFlag server versions 2.0.4 and earlier, presenting a critical denial of service risk that can be exploited by remote attackers. This flaw specifically targets the server's handling of client connection requests through the callsign parameter, which is a fundamental component of player identification within the BZFlag multiplayer gaming environment. The vulnerability arises from inadequate input validation mechanisms within the server's protocol parsing logic, where the system fails to properly terminate or validate string data structures before processing them.
The technical implementation of this vulnerability stems from a buffer handling flaw that occurs when the BZFlag server receives a connection request containing a callsign field. When an attacker sends a callsign string that lacks the required NULL termination character, the server's string parsing functions encounter undefined behavior during memory operations. This condition typically results in memory corruption, stack overflow, or pointer dereference errors that ultimately lead to application crash and complete service disruption. The flaw operates at the protocol level where the server expects standard C-style string termination but receives malformed data that bypasses normal validation checks.
The operational impact of this vulnerability extends beyond simple service interruption, as it can be leveraged by malicious actors to create sustained denial of service conditions against BZFlag gaming servers. Attackers can repeatedly send malformed connection requests with improperly terminated callsigns to continuously crash server processes, making the gaming environment inaccessible to legitimate players. This vulnerability particularly affects multiplayer gaming infrastructure where server stability is crucial for maintaining game sessions and player engagement. The remote nature of the exploit means that attackers do not require physical access to the server or network, making it a particularly dangerous flaw for public gaming servers.
Mitigation strategies for CVE-2005-4584 should prioritize immediate patching of affected BZFlag server installations to version 2.0.5 or later, which contains the necessary fixes for proper string termination handling. Network-level defenses can include implementing rate limiting and connection filtering rules to detect and block malformed connection attempts, though these measures may impact legitimate user access if not carefully configured. The vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and may also relate to CWE-787, concerning out-of-bounds write operations. From an ATT&CK framework perspective, this vulnerability maps to T1499.004, which covers network denial of service attacks, and potentially T1595.001, involving reconnaissance techniques used to identify vulnerable systems. Organizations should also implement monitoring solutions to detect unusual connection patterns and server crash events that may indicate exploitation attempts.