SB2020122913 - Cross-site scripting in Pi-hole

Description

This security bulletin contains information about 1 security vulnerability.

1) Sored cross-site scripting (CVE-ID: CVE-2020-35659)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within DNS query log. A remote attacker can permanently inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website, when the Pi-hole administrator visits the Query Log or Long-term data Query Log page.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Remediation

Install update from vendor's website.

References

• https://blog.mirch.io/2020/12/24/pihole-xss/
• https://discourse.pi-hole.net/t/pi-hole-core-web-v5-2-2-and-ftl-v5-3-3-released/41998
• https://github.com/pi-hole/AdminLTE/pull/1665