CVE-2020-35659 : Exploit Details and Defense Strategies

Pi-hole before version 5.2.2 is susceptible to stored XSS through the DNS query log, allowing attackers to execute arbitrary JavaScript.

Understanding CVE-2020-35659

Pi-hole, a DNS sinkhole that protects devices from unwanted content, is vulnerable to stored XSS attacks.

What is CVE-2020-35659?

The DNS query log in Pi-hole before version 5.2.2 is prone to stored XSS. This vulnerability enables malicious actors to execute arbitrary JavaScript by querying DNS with a malicious hostname.

The Impact of CVE-2020-35659

Exploiting this vulnerability can lead to arbitrary code execution when the Pi-hole administrator accesses the Query Log or Long-term data Query Log page.

Technical Details of CVE-2020-35659

Pi-hole's vulnerability to stored XSS can have severe consequences:

Vulnerability Description

Pi-hole versions prior to 5.2.2 are affected by stored XSS through the DNS query log.

Affected Systems and Versions

Pi-hole versions before 5.2.2 are vulnerable to this exploit.

Exploitation Mechanism

Attackers can trigger the execution of arbitrary JavaScript by querying DNS with a malicious hostname.

Mitigation and Prevention

Protect your system from CVE-2020-35659 with these measures:

Immediate Steps to Take

Update Pi-hole to version 5.2.2 or later to patch the vulnerability.
Monitor for any suspicious activities in the Query Log or Long-term data Query Log.

Long-Term Security Practices

Regularly update Pi-hole and other software to prevent security vulnerabilities.
Educate administrators on safe browsing practices to mitigate the risk of XSS attacks.

Patching and Updates

Stay informed about security updates and apply patches promptly to safeguard against known vulnerabilities.