Executive Summary

CVE-2025-55304 is a denial-of-service vulnerability in the Exiv2 library version 0.28.5, which is used to read and modify image metadata. The issue arises from a quadratic time complexity algorithm in the ICC profile parsing code when processing JPEG images. Specifically, the parser repeatedly reallocates and copies the ICC profile data chunks inefficiently, causing excessive CPU and memory usage. An attacker can craft a malicious JPEG file with many ICC profile chunks that trigger this inefficient processing, causing the program to run for a very long time or crash. The vulnerability was fixed in version 0.28.6 by introducing a more efficient method to append ICC profile data without repeated copying. [1, 2, 4]

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Impact Analysis

This vulnerability can cause a denial-of-service condition by making the Exiv2 library consume excessive CPU and memory resources when processing specially crafted JPEG images. This can lead to application crashes, hangs, or unresponsiveness, potentially disrupting services or workflows that rely on Exiv2 for image metadata processing. The impact is limited to availability and does not affect confidentiality or integrity. [2, 4]

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Detection Guidance

This vulnerability can be detected by testing the Exiv2 utility or library with specially crafted JPEG files containing malicious ICC profile APP2 segments that cause excessive CPU and memory usage. A practical approach is to use or create test JPEG files similar to the proof-of-concept described in Resource 4, which includes a Python script to generate such files (e.g., icc_mem_bomb.jpg or icc_cpu_bomb.jpg). Running Exiv2 commands to read metadata from these files will reveal if the system is vulnerable by observing hangs or crashes. For example, you can run: `exiv2 <crafted-malicious-jpeg-file>` and monitor CPU and memory usage. There are no specific built-in commands mentioned to detect the vulnerability automatically, but monitoring Exiv2's behavior on suspicious JPEG files is recommended. [4]

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Mitigation Strategies

The immediate mitigation step is to upgrade Exiv2 to version 0.28.6 or later, where the vulnerability has been fixed by improving the ICC profile parsing algorithm to avoid quadratic time complexity and excessive resource consumption. Until the upgrade is applied, avoid processing untrusted or suspicious JPEG files with Exiv2 to reduce the risk of denial-of-service. Additionally, applying input validation or sandboxing Exiv2 processes can help limit the impact of potential exploitation. [1, 2, 3]

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