CVE-2021-32637 : Vulnerability Insights and Analysis
Discover the critical vulnerability CVE-2021-32637 in Authelia software, allowing attackers to bypass authentication mechanisms. Learn how to mitigate this issue and prevent security risks.
Authelia is a single sign-on multi-factor portal for web apps. A vulnerability in the software allows a malicious actor to bypass the authentication mechanism by crafting a malformed HTTP request. The issue affects users utilizing nginx ngx_http_auth_request_module with Authelia. It is crucial to apply the necessary patches or workarounds to mitigate this critical vulnerability.
Understanding CVE-2021-32637
This CVE details an authentication bypass vulnerability in Authelia, impacting specific versions of the software.
What is CVE-2021-32637?
CVE-2021-32637 refers to an improper authentication vulnerability in Authelia software, enabling attackers to bypass the authentication mechanism by exploiting a malformed HTTP request.
The Impact of CVE-2021-32637
The vulnerability poses a critical risk with a CVSS base score of 10, allowing unauthorized users to gain high privileges and compromise the confidentiality and integrity of the system without requiring any user interaction.
Technical Details of CVE-2021-32637
The technical aspects of the CVE-2021-32637 vulnerability shed light on its description, affected systems and versions, and exploitation mechanism.
Vulnerability Description
The vulnerability allows a malicious individual to craft a malformed HTTP request to bypass the authentication mechanism of Authelia when used with nginx ngx_http_auth_request_module.
Affected Systems and Versions
The issue affects Authelia versions greater than or equal to 4.0.0-alpha1 and less than 4.29.3.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending a specially crafted HTTP request, enabling them to bypass the authentication process.
Mitigation and Prevention
To address CVE-2021-32637, immediate steps, long-term security practices, and patching updates are essential.
Immediate Steps to Take
- Upgrade Authelia to version 4.29.3 to completely mitigate the vulnerability.
- Alternatively, apply the provided git patch for version 4.25.1 or backport the fix to earlier versions upon request.
Long-Term Security Practices
Regularly monitor for security advisories and update Authelia to the latest versions to prevent vulnerabilities.
Patching and Updates
Utilize the patches provided by Authelia to secure your systems and prevent exploitation of this vulnerability.