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CVE-2025-6297: Exploitation of dpkg-deb Extraction Vulnerability

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Overview

CVE-2025-6297 is a high severity vulnerability discovered in dpkg-deb, a software that is widely used in the implementation and management of .deb packages on Debian-based systems. This vulnerability could potentially lead to system compromise or data leakage, and therefore, it warrants immediate attention and action. It appears that the flaw revolves around the inability of dpkg-deb to sanitize directory permissions adequately, leading to potential Denial of Service (DoS) scenarios.

Vulnerability Summary

CVE ID: CVE-2025-6297
Severity: High (8.2 CVSS v3)
Attack Vector: Local
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

dpkg-deb | All versions prior to the vendor patch

How the Exploit Works

The exploit takes advantage of dpkg-deb’s failure to sanitize directory permissions adequately when extracting a control member into a temporary directory. The process is documented as a safe operation, even on untrusted data. However, the lack of proper directory permissions’ sanitization may result in leaving temporary files behind on cleanup.
In scenarios where dpkg-deb commands are automated and repeatedly executed on adversarial .deb packages or with well-compressible files, placed inside a directory with permissions not allowing removal by a non-root user, this leads to a DoS scenario. The DoS scenario arises due to disk quota exhaustion or full disk conditions.

Conceptual Example Code

The conceptual example below demonstrates how the vulnerability might be exploited. It shows the creation of a malicious .deb package and its extraction using dpkg-deb.

# Create a malicious .deb package
$ echo "malicious content" > exploit
$ tar -cf control.tar exploit
$ ar -r malicious.deb control.tar
# Exploit the vulnerability
$ dpkg-deb -x malicious.deb /tmp/vulnerable_directory

Given the severity and potential impact of this vulnerability, it is recommended to apply the vendor patch immediately. If that is not immediately possible, consider using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary mitigation measure. Nevertheless, these measures should not replace the need for patching.

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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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