CVE-2021-29449 : Pi-hole is a Linux network-level advertisement and Internet tracker blocking app

Pi-hole is a Linux network-level advertisement and Internet tracker blocking application. Multiple privilege escalation vulnerabilities were discovered in version 5.2.4 of Pi-hole core. See the referenced GitHub security advisory for details.

Published 2021-04-14 22:15:13

Updated 2022-08-02 16:01:10

Source GitHub, Inc.

View at NVD, CVE.org

Vulnerability category: Gain privilege

Products affected by CVE-2021-29449

Pi-hole » Pi-hole
Versions up to, including, (<=) 5.2.4
cpe:2.3:a:pi-hole:pi-hole:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-29449

EPSS FAQ

0.46%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 75 %

Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2021-29449

Pi-Hole Remove Commands Linux Priv Esc

Disclosure Date: 2021-04-20

First seen: 2022-12-23

exploit/linux/local/pihole_remove_commands_lpe

Pi-Hole versions 3.0 - 5.3 allows for command line input to the removecustomcname, removecustomdns, and removestaticdhcp functions without properly validating the parameters before passing to sed. When executed as the www-data user, this allows for a privile

More information

CVSS scores for CVE-2021-29449

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.2	HIGH	AV:L/AC:L/Au:N/C:C/I:C/A:C	3.9	10.0	NIST
Access Vector: Local Access Complexity: Low Authentication: None Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete
7.8	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	1.8	5.9	NIST
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
6.3	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L	2.0	3.7	GitHub, Inc.
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Changed Confidentiality: Low Integrity: Low Availability: Low

CWE ids for CVE-2021-29449

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Assigned by: nvd@nist.gov (Primary)
CWE-269 Improper Privilege Management

The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Assigned by: security-advisories@github.com (Secondary)

References for CVE-2021-29449

https://www.compass-security.com/fileadmin/Research/Advisories/2021-02_CSNC-2021-008_Pi-hole_Privilege_Escalation.txt

Exploit;Third Party Advisory
http://packetstormsecurity.com/files/163715/Pi-Hole-Remove-Commands-Linux-Privilege-Escalation.html

Pi-Hole Remove Commands Linux Privilege Escalation ≈ Packet Storm
Exploit;Third Party Advisory;VDB Entry
https://github.com/pi-hole/pi-hole/security/advisories/GHSA-3597-244c-wrpj

Multiple Privilege Escalation Vulnerabilities Pihole · Advisory · pi-hole/pi-hole · GitHub
Exploit;Third Party Advisory

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