CVE-2007-4531 in Soldat game server
Summary
by MITRE
Soldat game server 1.4.2 and earlier, and dedicated server 2.6.2 and earlier, allows remote attackers to cause a client denial of service (crash) via (1) a long string to the file transfer port or (2) a long chat message, or (3) a server denial of service (continuous beep and slowdown) via a string containing many 0x07 or other control characters to the file transfer port.
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Analysis
by VulDB Data Team • 01/26/2025
The vulnerability identified as CVE-2007-4531 affects the Soldat game server software version 1.4.2 and earlier, as well as the dedicated server version 2.6.2 and earlier. This represents a classic buffer overflow condition that manifests through improper input validation mechanisms within the server's communication protocols. The flaw exists in how the server processes incoming data through its file transfer port and chat functionality, creating opportunities for remote attackers to exploit these weaknesses without requiring authentication or privileged access. The vulnerability falls under the category of denial of service attacks that can completely disrupt service availability for legitimate users.
The technical implementation of this vulnerability stems from inadequate bounds checking and string handling within the server's network protocol handlers. When attackers send malformed data containing excessively long strings to the file transfer port, the server's memory management routines fail to properly validate input lengths, leading to buffer overflows that cause client applications to crash. Additionally, the server's chat message processing lacks proper sanitization of control characters, allowing attackers to craft malicious input containing numerous 0x07 characters or other control sequences that trigger continuous beeping sounds and system slowdowns. This behavior demonstrates the server's failure to implement proper input sanitization and validation mechanisms that are fundamental requirements for secure network service implementations.
The operational impact of this vulnerability extends beyond simple service disruption to encompass complete system instability and user experience degradation. Client applications connecting to affected servers will experience immediate crashes when processing malicious file transfers or chat messages, effectively preventing legitimate users from participating in gameplay or communication. The continuous beeping and system slowdowns caused by control character injection create a persistent denial of service condition that can render the entire server unusable for extended periods. This vulnerability represents a significant threat to gaming server availability and can be exploited by anyone with network access to the affected ports, making it particularly dangerous in public gaming environments where multiple users connect simultaneously.
Security practitioners should implement immediate mitigations including network-level filtering to restrict access to the vulnerable file transfer ports, implementing input length validation and sanitization at all network protocol layers, and deploying intrusion detection systems to monitor for suspicious traffic patterns. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflows, while also mapping to ATT&CK technique T1499.004 for network denial of service attacks. Organizations should also consider implementing rate limiting and connection throttling mechanisms to prevent exploitation through excessive traffic patterns. The most effective long-term solution involves upgrading to patched versions of the Soldat server software that include proper input validation and memory management protections, along with comprehensive security testing of all network-facing services to identify similar vulnerabilities in other applications.