CVE-2009-2688 in XEmacs
Summary
by MITRE
Multiple integer overflows in glyphs-eimage.c in XEmacs 21.4.22, when running on Windows, allow remote attackers to cause a denial of service (crash) or execute arbitrary code via (1) the tiff_instantiate function processing a crafted TIFF file, (2) the png_instantiate function processing a crafted PNG file, and (3) the jpeg_instantiate function processing a crafted JPEG file, all which trigger a heap-based buffer overflow. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 03/30/2025
The vulnerability described in CVE-2009-2688 represents a critical security flaw affecting XEmacs 21.4.22 on Windows platforms, specifically within the graphics handling components that process image files. This issue stems from multiple integer overflows occurring in the glyphs-eimage.c file, which serves as the core module for image processing within the XEmacs environment. The vulnerability is particularly concerning because it affects three major image formats - TIFF, PNG, and JPEG - making it a broad attack surface that could be exploited through various file types commonly encountered in email attachments, web downloads, or file transfers.
The technical implementation of this vulnerability involves integer overflow conditions that occur during the processing of malformed image files by the tiff_instantiate, png_instantiate, and jpeg_instantiate functions. When these functions encounter specially crafted malicious files, the integer overflows cause calculations to wrap around to extremely large values, which subsequently leads to heap-based buffer overflows during memory allocation. This type of vulnerability falls under CWE-190, which specifically addresses integer overflow conditions, and more broadly under CWE-121, which covers stack-based buffer overflow conditions. The heap-based nature of the buffer overflow makes this particularly dangerous as it can potentially allow attackers to manipulate memory layout and execute arbitrary code.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it represents a potential code execution vector that could be leveraged by remote attackers to gain unauthorized access to systems running vulnerable XEmacs versions. The fact that this affects Windows platforms specifically indicates that the vulnerability is tied to the Windows-specific implementation details of XEmacs, making it particularly relevant for organizations running Windows environments where XEmacs is used for document processing or email handling. The vulnerability demonstrates how image processing libraries can become attack vectors when proper input validation and integer overflow protection mechanisms are not implemented, aligning with ATT&CK technique T1203 which covers exploitation of software vulnerabilities for privilege escalation.
The exploitation of this vulnerability requires an attacker to craft malicious image files that specifically trigger the integer overflow conditions in the three affected functions. These crafted files could be delivered through various attack vectors including email attachments, web downloads, or file sharing systems where users might inadvertently open them with XEmacs. The vulnerability's classification as a heap-based buffer overflow means that successful exploitation could potentially lead to complete system compromise, depending on the execution environment and memory protection mechanisms in place. Organizations should note that this vulnerability affects a specific version of XEmacs and that the issue is likely resolved in newer versions through proper integer overflow checking and bounds validation in image processing functions. The vulnerability also highlights the importance of input sanitization in multimedia processing libraries and demonstrates how seemingly benign file format handling can become a critical security concern when proper validation is not implemented.