CVE-2021-4287 : Vulnerability Insights and Analysis
Learn about CVE-2021-4287, a symlink following vulnerability in ReFirm Labs binwalk up to version 2.3.2. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
This article discusses the details of CVE-2021-4287, a vulnerability found in ReFirm Labs binwalk versions up to 2.3.2, allowing symlink following in the Archive Extraction Handler component.
Understanding CVE-2021-4287
This section provides insights into the nature and implications of the vulnerability.
What is CVE-2021-4287?
The vulnerability identified as CVE-2021-4287 exists in ReFirm Labs binwalk up to version 2.3.2, affecting an unspecified function in the file src/binwalk/modules/extractor.py of the Archive Extraction Handler component. Exploiting this flaw allows symlink following, with the potential for remote attacks.
The Impact of CVE-2021-4287
The impact of CVE-2021-4287 could result in unauthorized access and malicious manipulation of files, posing a risk to the integrity, confidentiality, and availability of the affected systems.
Technical Details of CVE-2021-4287
This section delves into the specific technical aspects of the vulnerability.
Vulnerability Description
The vulnerability stems from an unknown function within ReFirm Labs binwalk versions up to 2.3.2, facilitating symlink following and exposing systems to potential exploitation.
Affected Systems and Versions
ReFirm Labs binwalk versions 2.3.0, 2.3.1, and 2.3.2 are confirmed to be impacted by this vulnerability, specifically in the Archive Extraction Handler module.
Exploitation Mechanism
Exploiting this vulnerability involves leveraging the flawed code within the extractor.py file to follow symlinks, allowing attackers to execute remote attacks.
Mitigation and Prevention
To safeguard systems from CVE-2021-4287, immediate actions and long-term security practices are recommended.
Immediate Steps to Take
Users are advised to upgrade affected systems to version 2.3.3 of ReFirm Labs binwalk, which contains the necessary patches to mitigate the symlink following vulnerability.
Long-Term Security Practices
In addition to immediate patching, implementing secure coding practices, network segmentation, and regular security updates can enhance overall system resilience.
Patching and Updates
For complete mitigation, it is crucial to apply the provided patches and updates promptly to eliminate the vulnerability and secure the affected systems.