CVE-2005-0621 in Scrapland
Summary
by MITRE
Scrapland 1.0 and earlier allows remote attackers to cause a denial of service (server termination) by triggering an error, which is treated as a fatal error by the server, as demonstrated using (1) signed integers for size values, (2) an invalid model, (3) a "newpos" value that is less than or equal to a size value, or (4) partial packets.
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Analysis
by VulDB Data Team • 07/07/2018
The vulnerability identified as CVE-2005-0621 affects Scrapland version 1.0 and earlier, representing a critical denial of service weakness in the game server implementation. This flaw demonstrates how improper error handling can lead to complete service termination, making it a significant concern for networked gaming environments where server stability directly impacts player experience and game availability. The vulnerability stems from the server's inability to gracefully handle malformed or unexpected input data, treating even recoverable errors as fatal conditions that result in immediate server shutdown.
The technical exploitation of this vulnerability occurs through several distinct attack vectors that all share the common theme of malformed data input. Attackers can trigger the denial of service by manipulating signed integers used for size values, which can cause integer overflow or underflow conditions that the server cannot properly process. Additionally, sending an invalid model identifier or a "newpos" value that is less than or equal to a size value creates mathematical inconsistencies that the server's error handling mechanisms cannot resolve. The fourth vector involves sending partial packets, which can cause the server to encounter incomplete data structures that it cannot properly interpret or discard. These attack vectors collectively demonstrate a fundamental lack of input validation and error recovery mechanisms within the server software.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be exploited by malicious actors to repeatedly terminate server operations and potentially disrupt gaming sessions for multiple users simultaneously. The server termination occurs because the implementation treats these error conditions as unrecoverable failures rather than transient issues that could be logged and handled gracefully. This design flaw means that even a single malicious packet can cause complete server shutdown, requiring manual intervention to restore service and potentially resulting in lost player data or game state. The vulnerability affects the availability aspect of the security triad, making it particularly dangerous in production gaming environments where uptime is critical for user satisfaction and business operations.
From a cybersecurity perspective, this vulnerability aligns with CWE-248, which addresses "Uncaught Exception" conditions in software implementations, and demonstrates how improper exception handling can lead to complete system failure. The attack pattern follows typical denial of service methodologies described in the MITRE ATT&CK framework under the "Denial of Service" tactic, where adversaries seek to make services unavailable to legitimate users. The vulnerability also reflects poor software engineering practices related to input validation and defensive programming, where the software assumes all input will be well-formed and does not account for malformed data that might be sent over network connections. Effective mitigation strategies should include implementing comprehensive input validation, establishing proper error recovery mechanisms, and ensuring that error conditions do not result in server termination. These measures align with industry best practices for secure coding and system resilience, particularly in networked applications where external inputs cannot be trusted and must be rigorously validated before processing.