CVE-2019-3877 : Vulnerability Insights and Analysis

A security flaw has been discovered in mod_auth_mellon prior to version 0.14.2. The vulnerability allows malicious actors to bypass the validation mechanism for redirect URLs.

Understanding CVE-2019-3877

This CVE involves a security vulnerability in mod_auth_mellon that enables an open redirect in the logout URL, potentially leading to a security breach.

What is CVE-2019-3877?

The vulnerability in mod_auth_mellon before version 0.14.2 allows requests with backslashes to be processed as relative URLs, enabling attackers to circumvent the validation mechanism for redirect URLs.

The Impact of CVE-2019-3877

The impact of this vulnerability is rated as medium severity with a CVSS base score of 5.8. It affects the integrity of the system by allowing unauthorized redirection of URLs.

Technical Details of CVE-2019-3877

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability in mod_auth_mellon before v0.14.2 allows malicious actors to exploit an open redirect in the logout URL, bypassing the validation mechanism for redirect URLs.

Affected Systems and Versions

Product: mod_auth_mellon
Vendor: uninett
Versions Affected: v0.14.2

Exploitation Mechanism

The vulnerability occurs due to an open redirect in the logout URL, enabling requests with backslashes to be processed as relative URLs, allowing attackers to bypass URL validation.

Mitigation and Prevention

Protect your systems from CVE-2019-3877 with the following steps:

Immediate Steps to Take

Update mod_auth_mellon to version 0.14.2 or later to mitigate the vulnerability.
Monitor and restrict access to the affected systems to prevent unauthorized exploitation.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Implement secure coding practices to prevent similar issues in the future.

Patching and Updates

Ensure timely installation of security patches and updates to keep systems secure.