CVE-2021-36396 Explained : Impact and Mitigation
Learn about CVE-2021-36396, a security flaw in Moodle allowing blind SSRF risk. Understand the impact, affected versions, and mitigation strategies.
A vulnerability in Moodle allowed a blind SSRF risk due to insufficient redirect handling, potentially bypassing cURL restrictions.
Understanding CVE-2021-36396
This CVE refers to a security issue in Moodle that could lead to a blind SSRF risk.
What is CVE-2021-36396?
The CVE-2021-36396 vulnerability in Moodle was caused by inadequate redirect handling, enabling the bypassing of cURL restrictions and creating a blind SSRF risk.
The Impact of CVE-2021-36396
Exploitation of this vulnerability could allow attackers to send crafted requests, potentially leading to unauthorized access to internal systems.
Technical Details of CVE-2021-36396
This section provides technical insights into the vulnerability.
Vulnerability Description
The vulnerability in Moodle allowed attackers to blindly bypass cURL restrictions, opening the door to an SSRF risk.
Affected Systems and Versions
Moodle versions 3.11, 3.10 to 3.10.4, 3.9 to 3.9.7, and earlier unsupported versions are affected by this vulnerability.
Exploitation Mechanism
Attackers could exploit this vulnerability by manipulating redirect handling in Moodle to initiate blind SSRF attacks.
Mitigation and Prevention
Steps to address and prevent the exploitation of CVE-2021-36396.
Immediate Steps to Take
Users should apply patches or updates provided by Moodle to mitigate the vulnerability. Additionally, administrators can restrict network access to impacted systems.
Long-Term Security Practices
Implementing secure coding practices, regular security audits, and user awareness training can help prevent similar vulnerabilities in the future.
Patching and Updates
Ensure that the Moodle instance is updated to the latest version to address CVE-2021-36396.