CVE-2016-5652 in LibTIFF
Summary
by MITRE
An exploitable heap-based buffer overflow exists in the handling of TIFF images in LibTIFF's TIFF2PDF tool. A crafted TIFF document can lead to a heap-based buffer overflow resulting in remote code execution. Vulnerability can be triggered via a saved TIFF file delivered by other means.
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Analysis
by VulDB Data Team • 04/20/2025
The vulnerability identified as CVE-2016-5652 represents a critical heap-based buffer overflow in LibTIFF's TIFF2PDF conversion tool, classified under CWE-121 Heap-based Buffer Overflow. This flaw resides in the processing of TIFF image files when they are converted to PDF format, creating a remote code execution vector that can be exploited through maliciously crafted image files. The vulnerability stems from insufficient input validation and memory management within the TIFF2PDF utility, which fails to properly bounds-check data during the conversion process from TIFF to PDF formats. Security researchers have identified that when the tool processes malformed TIFF files, it allocates insufficient memory buffers to accommodate the incoming data, leading to memory corruption that can be leveraged by attackers to execute arbitrary code on vulnerable systems.
The technical exploitation of this vulnerability involves crafting a specially designed TIFF file that contains malicious payload data exceeding the allocated buffer boundaries. When the TIFF2PDF tool processes this crafted file, the overflow occurs in heap memory management, potentially allowing attackers to overwrite adjacent memory locations with controlled data. This memory corruption can be manipulated to redirect program execution flow, enabling attackers to inject and execute malicious code with the privileges of the user running the TIFF2PDF utility. The vulnerability is particularly dangerous because it can be triggered through various delivery mechanisms including email attachments, web downloads, or file sharing platforms, making it a significant threat in remote attack scenarios. The heap-based nature of the overflow provides attackers with additional flexibility in exploitation techniques compared to stack-based buffer overflows, as heap memory layout can be more easily controlled and manipulated.
The operational impact of CVE-2016-5652 extends beyond simple code execution, potentially allowing attackers to achieve full system compromise when the vulnerable tool is executed in environments where users process untrusted TIFF files. This vulnerability affects organizations that rely on LibTIFF for image processing workflows, particularly those that use TIFF2PDF in automated processing pipelines or allow user-uploaded image files. The risk is compounded by the fact that TIFF files are commonly used in professional environments such as publishing, graphic design, and document management systems, where the conversion to PDF is a routine operation. Attackers can leverage this vulnerability through social engineering campaigns targeting these environments, or by compromising systems that automatically process image files. The vulnerability can also be exploited in web applications that utilize LibTIFF for image conversion services, potentially leading to server-side code execution and complete system compromise.
Organizations should implement immediate mitigations including updating to patched versions of LibTIFF where available, as the vulnerability has been addressed in subsequent releases. System administrators should disable or restrict the execution of TIFF2PDF in environments where untrusted TIFF files may be processed, and implement strict input validation for all image file processing operations. Network segmentation and access controls should be enforced to limit exposure of systems running vulnerable versions of LibTIFF. Security monitoring should be enhanced to detect suspicious file processing activities, particularly when TIFF files are converted to PDF formats. Additionally, organizations should consider implementing sandboxing techniques for image processing operations and establishing secure coding practices that prevent similar buffer overflow conditions in custom applications that may interact with LibTIFF libraries. The vulnerability aligns with ATT&CK technique T1203 - Exploitation for Client Execution, emphasizing the need for comprehensive endpoint protection and application whitelisting strategies to prevent exploitation of this heap-based buffer overflow.