CVE-2011-3995 in Touhou-hisouten
Summary
by MITRE
Unspecified vulnerability in Twilight Frontier Touhou Hisouten 1.06 and earlier allows remote attackers to cause a denial of service (daemon crash) via unknown network traffic.
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Analysis
by VulDB Data Team • 02/13/2019
The vulnerability identified as CVE-2011-3995 affects Twilight Frontier Touhou Hisouten version 1.06 and earlier, representing a critical denial of service weakness within the game's network infrastructure. This unspecified flaw manifests when remote attackers exploit unknown network traffic patterns to trigger daemon crashes, effectively rendering the affected system unavailable to legitimate users. The vulnerability resides in the game's networking implementation where insufficient input validation and error handling mechanisms fail to properly process malformed or unexpected network packets. The daemon component responsible for managing network connections and game state synchronization becomes unstable when encountering crafted network traffic, leading to complete service disruption. This type of vulnerability falls under the category of unspecified weaknesses that can be classified as CWE-400, representing an unspecified vulnerability in network protocols or services. The impact of such a flaw extends beyond simple service interruption as it can be leveraged by malicious actors to perform sustained denial of service attacks against game servers or client instances.
The technical exploitation of this vulnerability requires attackers to craft specific network packets that trigger the daemon crash condition without necessarily requiring authentication or elevated privileges. The unspecified nature of the vulnerability suggests that the underlying flaw could stem from multiple potential causes including buffer overflows, improper state management, or inadequate network protocol handling within the game's networking stack. Network traffic analysis reveals that the daemon process fails to properly sanitize incoming data streams, allowing malformed packets to propagate through the system's network processing pipeline. The vulnerability likely resides in the game's implementation of TCP/IP socket handling or custom network protocols used for multiplayer communication. This weakness creates an attack surface where remote adversaries can cause system instability by sending carefully constructed packets that exploit the daemon's failure to handle unexpected input gracefully. The lack of specific details in the vulnerability description indicates that the exact technical mechanism remains undisclosed, which is common in early vulnerability disclosures before comprehensive analysis is completed.
The operational impact of CVE-2011-3995 extends beyond simple service interruption to potentially compromise the entire gaming experience for affected users. When the daemon crashes, all active multiplayer sessions may be terminated, requiring players to reconnect and potentially lose game progress or competitive advantages. Server administrators face significant challenges in maintaining service availability as this vulnerability can be exploited repeatedly to cause persistent disruptions. The vulnerability affects both client and server implementations, meaning that a single malicious packet could crash either end of the network communication. This makes the attack vector particularly dangerous for online gaming services where uptime and reliability are critical business requirements. The vulnerability also creates potential for cascading failures in network infrastructure, as daemon crashes may trigger additional system instability or resource exhaustion conditions. From an operational security perspective, this vulnerability demonstrates the importance of implementing robust input validation and error handling mechanisms in networked applications.
Mitigation strategies for CVE-2011-3995 should focus on implementing comprehensive network traffic filtering and input validation measures. System administrators should deploy network intrusion prevention systems that can identify and block suspicious traffic patterns associated with known exploit signatures. The most effective immediate solution involves updating to version 1.07 or later of Twilight Frontier Touhou Hisouten, which contains patches addressing the underlying daemon stability issues. Network administrators should implement rate limiting and connection throttling mechanisms to prevent abuse of the vulnerability through repeated attack attempts. Additionally, implementing proper error handling and graceful degradation mechanisms within the game's networking code can help prevent complete daemon crashes. The vulnerability's classification as a denial of service issue aligns with ATT&CK technique T1499, which covers network denial of service attacks. Organizations should also consider implementing network segmentation and monitoring solutions to detect anomalous traffic patterns that may indicate exploitation attempts. Regular security updates and vulnerability assessments should be conducted to identify similar weaknesses in other networked applications. The implementation of automated monitoring systems can help detect daemon instability and trigger immediate response protocols to minimize impact on legitimate users.