CVE-2009-1382 in mimetex
Summary
by MITRE
Multiple stack-based buffer overflows in mimetex.cgi in mimeTeX, when downloaded before 20090713, allow remote attackers to execute arbitrary code via a TeX file with long (1) picture, (2) circle, or (3) input tags.
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Analysis
by VulDB Data Team • 08/12/2021
The vulnerability identified as CVE-2009-1382 represents a critical stack-based buffer overflow in the mimetex.cgi component of mimeTeX software, a widely used tool for generating mathematical formulas and symbols in web environments. This flaw was present in mimeTeX versions released prior to July 13, 2009, and specifically affects the processing of TeX files containing extended mathematical notation. The vulnerability stems from inadequate input validation and bounds checking within the parsing logic of the mimeTeX application, creating exploitable conditions that can be leveraged by remote attackers to gain unauthorized system access.
The technical implementation of this vulnerability occurs when the mimetex.cgi script processes TeX files containing specially crafted picture, circle, or input tags that exceed predetermined buffer size limits. These specific TeX commands trigger stack memory corruption through direct buffer overflow conditions, where attacker-controlled data is written beyond the allocated memory boundaries. The flaw manifests in the way the application handles string parsing and memory allocation for mathematical expression rendering, particularly when processing complex mathematical notation that requires extensive memory buffer management. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is classified as a critical weakness in software security architectures.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the capability to completely compromise affected web servers hosting mimeTeX applications. Remote code execution allows adversaries to install backdoors, modify system files, steal sensitive data, or establish persistent access to compromised systems. The vulnerability affects web servers that utilize mimeTeX for mathematical formula rendering, particularly those running older versions of the software, making it a significant threat to educational institutions, research organizations, and any entity relying on mathematical content generation in web environments. The attack vector requires minimal privileges and can be executed through standard web-based exploitation techniques.
Mitigation strategies for CVE-2009-1382 focus primarily on immediate software updates and system hardening measures. Organizations should immediately upgrade to mimeTeX versions released after July 13, 2009, which contain proper buffer overflow protections and input validation mechanisms. System administrators should also implement network-based protections such as web application firewalls and input filtering to prevent malicious TeX content from reaching the vulnerable application. The vulnerability aligns with several ATT&CK techniques including T1190 for Exploit Public-Facing Application and T1059 for Command and Scripting Interpreter, demonstrating how this flaw can serve as a foundational entry point for more sophisticated attacks. Additionally, implementing proper memory protection mechanisms such as stack canaries and address space layout randomization can provide additional defense-in-depth measures against similar buffer overflow exploitation attempts.