CVE-2021-32706: pi-hole adminlte Code Injection

Vulnerability summary

CVE-2021-32706 is a high (CVSS 8.8) Code Injection vulnerability in pi-hole adminlte. EPSS estimates a 60.18% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 04-08-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

Pi-hole's Web interface provides a central location to manage a Pi-hole instance and review performance statistics. Prior to Pi-hole Web interface version 5.5.1, the `validDomainWildcard` preg_match filter allows a malicious character through that can be used to execute code, list directories, and overwrite sensitive files. The issue lies in the fact that one of the periods is not escaped, allowing any character to be used in its place. A patch for this vulnerability was released in version 5.5.1.

• CWE-94Improper Control of Generation of Code ('Code Injection')The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.