CVE-2007-4451 in Toribash
Summary
by MITRE
The server in Toribash 2.71 and earlier on Windows allows remote attackers to cause a denial of service (continuous beep and server hang) via certain commands that contain many 0x07 or other invalid characters.
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Analysis
by VulDB Data Team • 09/07/2018
The vulnerability identified as CVE-2007-4451 affects the Toribash game server version 2.71 and earlier on Windows platforms, representing a classic denial of service weakness that exploits improper input validation mechanisms. This flaw specifically targets the server's handling of certain commands that contain excessive null bytes or invalid control characters, particularly the 0x07 character which corresponds to the bell character in ASCII encoding. The vulnerability stems from the server's insufficient sanitization of incoming data, allowing malicious actors to craft specially formatted commands that trigger unintended system behavior.
The technical implementation of this vulnerability demonstrates a failure in input validation and sanitization processes, which aligns with CWE-20 - Improper Input Validation as classified by the CWE database. When the server receives commands containing numerous 0x07 characters or other invalid control sequences, it enters a continuous beep loop and subsequently hangs, rendering the service unavailable to legitimate users. This behavior occurs because the server's parsing logic does not properly handle or filter out these invalid characters during command processing, causing the system to become unresponsive and consume excessive CPU resources in the process.
From an operational perspective, this vulnerability presents a significant risk to server availability and system stability, particularly in environments where Toribash servers are used for multiplayer gaming or competitive events. The continuous beep and server hang conditions effectively render the service unusable, creating a denial of service scenario that can be exploited by remote attackers without requiring authentication or elevated privileges. The impact extends beyond simple service disruption as the hanging behavior can consume system resources and potentially affect other services running on the same host machine.
The attack vector for this vulnerability is straightforward, requiring only the ability to send specially crafted commands to the affected Toribash server. This makes it particularly dangerous in multi-user environments where server administrators cannot easily distinguish between legitimate and malicious input. The vulnerability's exploitation can be automated, allowing attackers to repeatedly send malformed commands and maintain the denial of service condition until the server is manually restarted or the system is rebooted. According to ATT&CK framework category T1499 - Endpoint Denial of Service, this represents a direct method of compromising system availability through resource exhaustion and process interference.
Mitigation strategies for CVE-2007-4451 should focus on implementing comprehensive input validation and sanitization measures within the server's command processing pipeline. System administrators should ensure that all incoming commands undergo strict character filtering to remove or escape invalid control characters before further processing. The recommended approach involves implementing a whitelist-based validation system that only accepts known good character sets while rejecting any input containing null bytes, bell characters, or other potentially problematic control sequences. Additionally, implementing rate limiting and connection timeouts can help prevent sustained exploitation attempts, while regular system monitoring should be deployed to detect unusual resource consumption patterns that may indicate ongoing attacks. The most effective long-term solution requires updating to a patched version of Toribash that properly handles invalid input characters and implements robust error recovery mechanisms to prevent the continuous beep and server hang conditions from occurring.