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CVE-2025-29069: Heap Buffer Overflow Vulnerability in lcms2-2.16

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Overview

A critical heap buffer overflow vulnerability, identified as CVE-2025-29069, has been discovered in the lcms2-2.16. This vulnerability could potentially lead to system compromise or data leakage. The issue arises in the UnrollChunkyBytes function of cmspack.c, which is in charge of handling color space transformations. This vulnerability has a significant impact on any entities using this version of lcms2 due to the potential breach of security and data integrity.

Vulnerability Summary

CVE ID: CVE-2025-29069
Severity: High (7.3 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

lcms2 | 2.16

How the Exploit Works

The heap buffer overflow vulnerability in lcms2-2.16 exists due to insufficient boundary checks during color space transformations. An attacker could exploit this vulnerability by sending specially crafted data to the affected application, which when processed by the UnrollChunkyBytes function in cmspack.c, would lead to a buffer overflow. This overflow could potentially allow the attacker to execute arbitrary code and compromise the system or lead to data leakage.

Conceptual Example Code

Here is a conceptual example of how an attacker might exploit this vulnerability:

POST /lcms2/process_color HTTP/1.1
Host: target.example.com
Content-Type: application/octet-stream
{ "color_data": "OVERFLOWING_BYTE_STREAM" }

In this example, the “color_data” field contains a byte stream that is longer than what the application can handle, leading to a buffer overflow when it attempts to process this data.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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