CVE-2006-2400 in Outgun
Summary
by MITRE
The leetnet functions (leetnet/rudp.cpp) in Outgun 1.0.3 bot 2 and earlier allow remote attackers to cause a denial of service (game interruption) via large packets, which cause an exception to be thrown.
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Analysis
by VulDB Data Team • 07/26/2018
The vulnerability identified as CVE-2006-2400 resides within the leetnet functions implemented in the rudp.cpp file of Outgun version 1.0.3 bot 2 and earlier versions. This represents a classic denial of service weakness that specifically targets the network communication layer of the application. The affected software operates as a bot framework that likely facilitates automated gameplay or network interactions, making it susceptible to remote exploitation by malicious actors who can disrupt normal operations through crafted network traffic.
The technical flaw manifests when the system receives large packets that exceed expected parameters within the leetnet communication functions. These oversized packets trigger an exception handling mechanism that causes the application to crash or become unresponsive, effectively interrupting the game or network service. The vulnerability stems from inadequate input validation and packet size checking within the rudp.cpp implementation, which fails to properly handle malformed or oversized network data. This type of vulnerability falls under the category of improper input validation as classified by CWE-20, where the system does not adequately validate the size or content of received network packets before processing them.
From an operational perspective, this vulnerability presents a significant risk to the availability of the Outgun application and its associated gaming services. Remote attackers can exploit this weakness to cause game interruptions, potentially disrupting player sessions or server operations. The impact extends beyond simple service disruption as it can affect the overall user experience and potentially compromise the integrity of ongoing gameplay. This vulnerability aligns with ATT&CK technique T1499.004 which involves network denial of service attacks that target application availability.
The exploitation of this vulnerability requires minimal technical skill and can be performed remotely without authentication. Attackers simply need to send oversized packets to the target system to trigger the exception and cause the denial of service condition. This makes the vulnerability particularly dangerous as it can be exploited by anyone with network access to the affected system. The lack of proper bounds checking in the network packet processing code means that legitimate network traffic can be disrupted by maliciously crafted oversized packets. The vulnerability represents a fundamental flaw in the software's defensive programming practices and highlights the importance of implementing robust input validation mechanisms to prevent such exceptions from occurring during normal operation.
Mitigation strategies should focus on implementing proper packet size validation and exception handling within the network communication layer. The most effective approach involves adding bounds checking to ensure that incoming packets do not exceed predetermined size limits before they are processed by the leetnet functions. Additionally, implementing proper error handling and graceful degradation mechanisms can prevent the application from crashing when encountering oversized packets. The fix should also include logging mechanisms to detect and alert on unusual packet sizes that might indicate attempted exploitation. Organizations should also consider implementing network-level protections such as rate limiting or packet filtering to prevent malicious oversized packets from reaching the vulnerable application. This vulnerability demonstrates the critical importance of defensive programming practices and proper input validation in preventing denial of service conditions that can severely impact system availability and user experience.