CVE-2018-25255: Buffer Overflow in 10-Strike LANState

The vulnerability lies in the structured exception handling mechanism when processing LSM map files. An attacker can create a malicious LSM file containing a payload within the ObjCaption parameter. This payload overflows a buffer, overwrites the SEH (Structured Exception Handling) chain, and ultimately allows the attacker to execute arbitrary shellcode on the system. Successful exploitation grants the attacker complete control over the affected machine, enabling them to install malware, steal sensitive data, or pivot to other systems on the network. The local nature of the vulnerability means the attacker needs direct access to the machine running LANState.

1. Reserved2026-04-04
2. Published2026-04-04
3. Modified2026-04-06
4. EPSS updated2026-04-12

Due to the absence of a patch, mitigation focuses on reducing the attack surface. The primary recommendation is to restrict access to LSM files, preventing unauthorized users from creating or modifying them. Implement strict file access controls and monitor file system activity for suspicious LSM files. Consider using a host-based intrusion detection system (HIDS) to detect attempts to exploit the vulnerability. While not a direct mitigation, regularly scanning the system for malware can help identify and remove any malicious code installed through exploitation. Verification after implementing these controls involves monitoring system logs for any unusual activity related to LSM file processing.