CVE-2021-32747 : Vulnerability Insights and Analysis

A vulnerability in Icinga Web 2 versions 2.0.0 to 2.8.2 allows exposure of custom variables to unauthorized users, impacting confidentiality. The issue has been fixed in versions 2.9.0, 2.8.3, and 2.7.5.

Understanding CVE-2021-32747

This CVE highlights a security flaw in Icinga Web 2 that could lead to unauthorized access to custom variables, potentially exposing sensitive information.

What is CVE-2021-32747?

Icinga Web 2, a monitoring web interface, had a vulnerability where custom variables could be viewed by unauthorized users between versions 2.0.0 and 2.8.2. These custom variables often contain sensitive data used for authentication.

The Impact of CVE-2021-32747

The vulnerability allows unauthorized users to view custom variables, potentially compromising sensitive information. This could lead to confidentiality issues for organizations using Icinga Web 2.

Technical Details of CVE-2021-32747

The CVSS score for this vulnerability is 5.3 (Medium severity) with a vector string of CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N. The attack complexity is high, but privileges required are low.

Vulnerability Description

Custom variables in Icinga Web 2 were displayed to unauthorized users, resulting in potential exposure of sensitive data. This issue was resolved in versions 2.9.0, 2.8.3, and 2.7.5.

Affected Systems and Versions

Icinga Web 2 versions between 2.0.0 and 2.8.2 are affected by this vulnerability where custom variables are exposed to unauthorized users.

Exploitation Mechanism

Unauthorized users could access custom variables by using an undocumented URL parameter, bypassing protection rules and blacklists set in the user's role.

Mitigation and Prevention

After the fix in versions 2.9.0, 2.8.3, and 2.7.5, immediate steps should be taken to secure the system and prevent future exploits.

Immediate Steps to Take

Organizations should update to the patched versions (2.9.0, 2.8.3, or 2.7.5) to mitigate the vulnerability. Additionally, setting up restrictions to hide custom variables is advised.

Long-Term Security Practices

Regularly monitor for security updates and apply patches promptly to prevent potential security risks. Educate users on the importance of data protection.

Patching and Updates

Stay informed about security advisories from Icinga and apply patches as soon as they are released to ensure ongoing protection against vulnerabilities.