CVE-2021-43957 : Vulnerability Insights and Analysis
Learn about CVE-2021-43957, a security vulnerability impacting Atlassian Fisheye and Crucible versions prior to 4.8.9, enabling remote attackers to access local files via an IDOR flaw.
CVE-2021-43957 was published on March 14, 2022. It affects Atlassian Fisheye and Crucible versions prior to 4.8.9, allowing remote attackers to access local files through an Insecure Direct Object References (IDOR) vulnerability in the WEB-INF directory. Here's what you need to understand about this CVE.
Understanding CVE-2021-43957
This section provides insights into the nature and impact of CVE-2021-43957.
What is CVE-2021-43957?
CVE-2021-43957 enables remote attackers to browse local files by exploiting an IDOR vulnerability in Atlassian Fisheye and Crucible versions before 4.8.9.
The Impact of CVE-2021-43957
The vulnerability allows unauthorized access to sensitive files, leading to potential data breaches and unauthorized retrieval of critical information.
Technical Details of CVE-2021-43957
Let's delve into the technical aspects of CVE-2021-43957.
Vulnerability Description
The vulnerability arises from an IDOR flaw in the WEB-INF directory, facilitating access to local files.
Affected Systems and Versions
- Product: Atlassian Fisheye
- Vendor: Atlassian
- Affected Versions: < 4.8.9
- Product: Crucible
- Vendor: Atlassian
- Affected Versions: < 4.8.9
Exploitation Mechanism
Attackers exploit the lack of proper URL decoding, allowing them to bypass the fix for a previous CVE (CVE-2020-29446) and gain unauthorized file access.
Mitigation and Prevention
Explore the mitigation strategies to safeguard your systems against CVE-2021-43957.
Immediate Steps to Take
- Upgrade Atlassian Fisheye and Crucible to version 4.8.9 or later to eliminate the vulnerability.
- Implement access controls to restrict unauthorized file access.
Long-Term Security Practices
- Regularly monitor for unusual file access patterns to detect potential unauthorized activities.
- Conduct security audits to identify and rectify any existing vulnerabilities.
Patching and Updates
Apply security patches and updates provided by Atlassian promptly to address CVE-2021-43957 and enhance system security.