CVE-2013-4232 in LibTIFF
Summary
by MITRE
Use-after-free vulnerability in the t2p_readwrite_pdf_image function in tools/tiff2pdf.c in libtiff 4.0.3 allows remote attackers to cause a denial of service (crash) or possible execute arbitrary code via a crafted TIFF image.
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Analysis
by VulDB Data Team • 05/21/2021
The CVE-2013-4232 vulnerability represents a critical use-after-free flaw within the libtiff library's tiff2pdf conversion utility, specifically in the t2p_readwrite_pdf_image function located in tools/tiff2pdf.c. This vulnerability exists in libtiff version 4.0.3 and demonstrates a classic memory safety issue where freed memory locations are accessed after being deallocated. The flaw occurs during the processing of TIFF image files when the software attempts to convert them to PDF format, making this vulnerability particularly dangerous in environments where automated image processing occurs. The vulnerability is classified under CWE-416, which specifically addresses the use of freed memory, and aligns with ATT&CK technique T1059.007 for command and scripting interpreter execution in the context of arbitrary code execution.
The technical exploitation of this vulnerability requires an attacker to craft a malicious TIFF image file that triggers the specific memory management error during the conversion process. When the vulnerable software processes such a crafted file, the t2p_readwrite_pdf_image function frees certain memory structures but continues to reference them later in the execution flow. This creates a scenario where subsequent operations on the freed memory can either cause a segmentation fault leading to denial of service or potentially allow for arbitrary code execution if the attacker can control the data that gets written to the freed memory locations. The vulnerability is particularly concerning because it can be triggered remotely through any system that processes untrusted TIFF files, including web applications, document conversion services, and automated workflow systems.
The operational impact of CVE-2013-4232 extends beyond simple denial of service to potentially enable remote code execution, making it a high-severity vulnerability for systems processing TIFF images. Organizations using libtiff 4.0.3 in their document processing pipelines, image servers, or content management systems face significant risk. The vulnerability affects any application that relies on the libtiff library for TIFF to PDF conversion, including but not limited to web applications, document management systems, and automated image processing workflows. Attackers can leverage this vulnerability to crash services, potentially leading to persistent denial of service conditions, or in more sophisticated attacks, to execute arbitrary code with the privileges of the affected process. The vulnerability's remote exploitability means that systems processing untrusted image files from web forms, email attachments, or file upload mechanisms are all at risk.
Mitigation strategies for CVE-2013-4232 should prioritize immediate patching of affected libtiff versions to 4.0.4 or later, where the vulnerability has been resolved through proper memory management fixes. Organizations should implement input validation and sanitization measures to prevent processing of untrusted TIFF files, particularly in web-facing applications. Network segmentation and access controls should be implemented to limit exposure of systems that process TIFF images. Security monitoring should be enhanced to detect unusual process crashes or memory access patterns that may indicate exploitation attempts. Additionally, organizations should consider implementing sandboxing techniques for image processing operations and maintaining regular security updates for all third-party libraries to prevent similar vulnerabilities from being exploited in their environments. The fix implemented in libtiff 4.0.4 addresses the specific memory management issue by ensuring proper handling of freed memory references and includes additional bounds checking to prevent the use-after-free condition that enabled the vulnerability.