CVE-2007-4449 in Toribash
Summary
by MITRE
The client in Toribash 2.71 and earlier allows remote attackers to cause a denial of service (application hang) via a command without an LF character, as demonstrated by a SAY command.
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Analysis
by VulDB Data Team • 09/07/2018
The vulnerability described in CVE-2007-4449 represents a classic input validation flaw that affects the Toribash gaming client version 2.71 and earlier. This issue specifically targets the client's command processing mechanism, where the application fails to properly handle command inputs that lack the expected line feed character. The Toribash client operates as a networked gaming platform where players communicate through various commands, with the SAY command serving as a primary means of text communication within the game environment. When an attacker sends a malformed command that omits the required line feed character, the client's parsing logic becomes unable to properly process the input, leading to a state where the application becomes unresponsive or enters an infinite loop while attempting to handle the malformed data.
The technical implementation of this vulnerability stems from inadequate input sanitization within the client's network protocol handler. The command processing subsystem in Toribash expects commands to follow a specific format that includes proper line termination sequences, typically consisting of carriage return and line feed characters. When a command arrives without the expected line feed character, the client's parsing routine encounters a condition where it cannot properly identify command boundaries or determine when a command has been fully received. This parsing failure results in the client's main processing thread becoming stuck in a loop or waiting indefinitely for additional data that will never arrive, causing the application to hang and effectively denying service to legitimate users. The vulnerability demonstrates poor defensive programming practices where the application does not implement proper error handling or timeout mechanisms for malformed network inputs.
From an operational perspective, this denial of service vulnerability creates significant impact for both individual users and the broader gaming community. The hanging client behavior prevents players from continuing their gaming sessions, potentially disrupting ongoing matches or tournaments. Network administrators responsible for maintaining gaming servers may find their client applications becoming unresponsive, affecting the overall user experience and potentially causing service interruptions. The vulnerability is particularly concerning because it requires no special privileges to exploit, making it accessible to any remote attacker who can establish a connection to the client. The specific demonstration using the SAY command suggests that this affects text-based communication features within the game, which are fundamental to player interaction and social engagement within the gaming environment.
The vulnerability aligns with CWE-129, which covers improper validation of input boundaries, and can be mapped to ATT&CK technique T1499.004 for denial of service attacks. The root cause lies in the client's failure to implement proper input validation and error recovery mechanisms, which are fundamental requirements for robust networked applications. The issue represents a failure to implement defensive programming practices such as bounded input handling, timeout mechanisms, and graceful error recovery. Organizations should implement mitigations including updating to patched versions of Toribash, implementing network-level filtering to detect and block malformed commands, and establishing timeout configurations for command processing. Additionally, the vulnerability highlights the importance of comprehensive input validation testing and the implementation of proper exception handling in networked applications to prevent similar issues from occurring in other software systems.