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CVE-2021-32706— (Authenticated) Remote Code Execution Possible in Web Interface 5.5

Quick assessment

Affected
pi-hole AdminLTE
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pi-hole是Pi-hole公司的一款网络级广告拦截应用程序。 Pi-hole 5.5.1之前版本存在安全漏洞，该漏洞源于Pi-hole的Web界面提供了一个中央位置来管理Pi-hole实例和检查性能统计信息，在Pi-hole Web界面5.5.1版本之前，恶意字符可以绕过 validDomainWildcard preg匹配过滤器，从而执行代码、列出目录和覆盖敏感文件。根源在于其中一个句点没有转义，允许在其位置使用任何字符。

CVSS 7.6 · High EPSS 60.18% · P99

Public Exploits 1

Metasploit · 1 pihole_domains_api_exec.rb [auxiliary]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-32706

Vulnerability Information
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Vulnerability Title
(Authenticated) Remote Code Execution Possible in Web Interface 5.5
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Pi-hole 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pi-hole是Pi-hole公司的一款网络级广告拦截应用程序。 Pi-hole 5.5.1之前版本存在安全漏洞，该漏洞源于Pi-hole的Web界面提供了一个中央位置来管理Pi-hole实例和检查性能统计信息，在Pi-hole Web界面5.5.1版本之前，恶意字符可以绕过 validDomainWildcard preg匹配过滤器，从而执行代码、列出目录和覆盖敏感文件。根源在于其中一个句点没有转义，允许在其位置使用任何字符。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pi-hole AdminLTE < 5.5.1 -

II. Public POCs for CVE-2021-32706

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III. Intelligence Information for CVE-2021-32706

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Vendor Advisories for CVE-2021-32706 (1)

Other References for CVE-2021-32706 (1)

IV. Related Vulnerabilities

Same product: AdminLTE
Same vendor: pi-hole
Same weakness: CWE-94

V. Comments for CVE-2021-32706

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