CVE-2007-1431 in PennMUSH
Summary
by MITRE
Multiple unspecified vulnerabilities in PennMUSH 1.8.3 before 1.8.3p1 and 1.8.2 before 1.8.2p3 allow attackers to cause a denial of service (crash) related to the (1) speak and (2) buy functions.
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Analysis
by VulDB Data Team • 08/26/2018
The vulnerability identified as CVE-2007-1431 affects PennMUSH versions 1.8.3 and earlier, as well as 1.8.2 versions prior to 1.8.2p3, representing a critical denial of service weakness that impacts the core functionality of this multi-user dungeon server software. This issue manifests through two specific functions within the PennMUSH environment: the speak and buy commands, which when exploited can cause the server to crash and become unavailable to legitimate users. The vulnerability stems from insufficient input validation and error handling mechanisms within these command processing functions, creating exploitable conditions that allow malicious actors to disrupt normal server operations.
The technical flaw resides in the improper handling of user input within the speak and buy command implementations, where the software fails to adequately validate or sanitize data before processing. This weakness creates a condition where malformed or specially crafted input can trigger unexpected behavior in the server's memory management or execution flow, ultimately leading to application termination. The vulnerability operates at the application layer and can be classified under CWE-20 as "Improper Input Validation," while also exhibiting characteristics of CWE-122 as "Heap-based Buffer Overflow" when the input exceeds allocated memory boundaries during processing. The attack vector requires no authentication and can be executed by any user connected to the affected PennMUSH server, making it particularly dangerous in multi-user environments where users may not be properly vetted.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be leveraged to create persistent availability issues that affect all users within the MUD environment. When exploited successfully, the server crash can result in loss of game state, disconnection of legitimate players, and potential data integrity issues if the crash occurs during critical operations. The vulnerability affects the availability aspect of the CIA triad, specifically targeting the system's ability to provide uninterrupted service to authorized users. According to ATT&CK framework, this vulnerability maps to T1499.004 as "Endpoint Denial of Service" and represents a form of resource exhaustion attack that can be executed with minimal technical expertise. The impact is particularly severe in gaming environments where continuous uptime is essential for user experience and game progression.
Mitigation strategies for CVE-2007-1431 focus primarily on applying the vendor-provided patches that address the specific input validation issues in the speak and buy functions. System administrators should immediately upgrade to PennMUSH versions 1.8.3p1 or 1.8.2p3, which contain the necessary fixes to prevent the exploitation of these vulnerabilities. Additionally, implementing input filtering mechanisms and robust error handling procedures can provide defense-in-depth measures that reduce the likelihood of successful exploitation. Network-level protections such as rate limiting and connection monitoring can help detect and prevent abuse of these functions. Organizations should also consider implementing intrusion detection systems that can identify patterns of exploitation attempts targeting these specific command functions, while maintaining comprehensive logging of all user activities to facilitate forensic analysis in case of successful attacks. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other components of the MUD infrastructure that may present analogous attack surfaces.