Remote Code Execution Vulnerability in Pi-hole's Gravity Updater
CVE-2020-11108

8.8HIGH

Key Information:

Vendor

Pi-hole

Status
Pi-hole
Vendor
CVE Published:
11 May 2020

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 89%

What is CVE-2020-11108?

The Gravity updater in Pi-hole version 4.4 presents a security flaw that allows an authenticated attacker to upload arbitrary files. This vulnerability can be exploited for Remote Code Execution by writing malicious PHP files to the web directory. Additionally, when combined with the sudo permissions of the www-data user, it can enable attackers to escalate privileges to the root level. The issue lies within the gravity_DownloadBlocklistFromUrl function in gravity.sh, which does not properly validate user inputs, leading to significant security risks.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2020-11108-PoC
Created by Frichetten

References

https://frichetten.com/blog/cve-2020-11108-pihole-rce/
x_refsource_MISC
https://github.com/Frichetten/CVE-2020-11108-PoC
x_refsource_MISC
http://packetstormsecurity.com/files/157623/Pi-hole-4.4-R...
x_refsource_MISC

EPSS Score

89% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability Reserved

.