CVE-2021-32793 : Security Advisory and Response

Pi-hole's Web interface version < 5.5.1 is susceptible to a stored cross-site scripting vulnerability, allowing remote attackers to exploit administrative user accounts through client-side attacks. It has a CVSS score of 5.7 (Medium Severity).

Understanding CVE-2021-32793

This CVE highlights a stored XSS vulnerability in Pi-hole's Web interface prior to version 5.5.1.

What is CVE-2021-32793?

Pi-hole's Web interface is vulnerable to a stored cross-site scripting flaw before version 5.5.1, enabling attackers to target administrative users through malicious scripts.

The Impact of CVE-2021-32793

The vulnerability poses a medium-severity risk with a CVSS score of 5.7, potentially leading to unauthorized access to administrative accounts.

Technical Details of CVE-2021-32793

The following technical aspects further elaborate on the vulnerability.

Vulnerability Description

User input as a wildcard domain added to blocklists or allowlists is not properly filtered in the Pi-hole Web interface, resulting in a persistent XSS threat.

Affected Systems and Versions

Pi-hole's Web interface versions earlier than 5.5.1 are impacted by this stored XSS vulnerability.

Exploitation Mechanism

An attacker can exploit this vulnerability by injecting malicious scripts through wildcard domains, targeting administrative user accounts.

Mitigation and Prevention

To address CVE-2021-32793, proactive measures and patches are essential to ensure system security.

Immediate Steps to Take

Upgrade Pi-hole Web interface to version 5.5.1 or later to mitigate the stored XSS vulnerability. Ensure user input validation to prevent script injections.

Long-Term Security Practices

Regularly monitor security advisories and apply updates promptly to safeguard against emerging vulnerabilities and cyber threats.

Patching and Updates

Refer to the official patch released in Pi-hole Web interface version 5.5.1 to remediate the stored XSS vulnerability effectively.