PT-2021-19935 · Unknown · Pi-Hole Web Interface

Dariusz Gońda + 1 · Published 2021-08-04 · Updated 2021-08-12 · CVE-2021-32793

Positive Technologies (AI Summary)

CVSS v3.1

5.7

Medium

Base vector

AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:H

Name of the Vulnerable Software and Affected Versions Pi-hole Web Interface versions prior to 5.5.1

Description The Pi-hole Web interface has a stored cross-site-scripting vulnerability in the function to add domains to blocklists or allowlists. This vulnerability exists because user input added as a wildcard domain to a blocklist or allowlist is unfiltered in the web interface, allowing for a persistent XSS vulnerability. A remote attacker can attack administrative user accounts through client-side attacks.

Recommendations For versions prior to 5.5.1, update to Pi-hole Web Interface version 5.5.1 to resolve the issue. As a temporary workaround, consider restricting access to the blocklist and allowlist functions until the update is applied. Avoid using unfiltered user input as wildcard domains in blocklists or allowlists until the issue is resolved.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-32793

GHSA-G3W6-Q4FG-P8X8

Affected Products

Pi-Hole Web Interface

References · 7

• 🔥 https://github.com/pi-hole/AdminLTE/security/advisories/GHSA-g3w6-q4fg-p8x8 · Exploit
• https://osv.dev/vulnerability/CVE-2021-32793 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-32793 · Security Note
• https://github.com/pi-hole/AdminLTE/releases/tag/v5.5.1 · Note
• https://t.me/cibsecurity/26854 · Telegram Post
• https://t.me/cvenotify/19217 · Telegram Post
• https://t.me/cvenotify/18660 · Telegram Post