CVE-2023-51885: 
Linux Debian vulnerability analysis and mitigation

Buffer Overflow vulnerability in Mathtex v.1.05 and before allows a remote attacker to execute arbitrary code via the length of the LaTeX string component. The vulnerability was discovered and disclosed in January 2024, affecting all versions of Mathtex up to and including version 1.05. This critical security flaw has been assigned CVE-2023-51885 with a CVSS v3.1 base score of 9.8 (NVD).

The vulnerability occurs in the main function where the LaTeX string is copied to the buffer exprbuffer (in bss) using memcmp, and then further copied to the buffer hashexpr (in stack) without proper length checking. When the length of the input LaTeX string exceeds 32768 bytes, it triggers both a global-buffer-overflow and a stack-overflow condition. This vulnerability affects both CLI mode and CGI mode if the maximum URL length of the HTTP server is larger than 32768 bytes (Yulun Blog).

The vulnerability allows remote attackers to execute arbitrary code on affected systems. Given its CVSS score of 9.8 (Critical), this vulnerability represents a severe security risk that could lead to complete system compromise (NVD).

Users should upgrade to a version newer than 1.05 if available. For systems that cannot be immediately upgraded, implementing input length validation at the web server level to restrict LaTeX string length to less than 32768 bytes can help mitigate the risk (NVD).