External risk intelligence

Pi-hole Remote Code Execution Vulnerability.

CVE advisoryKnown Exploit

CVE-2020-8816

A vulnerability in Pi-hole's web interface allows authenticated users to execute remote code by crafting a DHCP static lease. This could lead to unauthorized system access and data compromise for organizations using specific versions.

2Halo Surface Signal

OS Command Injection

Pi Hole

4.3.2 and earlier

External exposure likelihood

Halo Surface Signal score for CVE-2020-8816

Pi-hole is designed as a local network DNS sinkhole for ad blocking and is typically deployed within internal private networks. While the web dashboard can be exposed, it is not intended for public internet exposure, and access requires administrative authentication, making public internet reachability uncommon in standard deployments.

Horizon Alert

Summary of the vulnerability and why it matters

The Pi-hole web interface is vulnerable due to a flaw in how it handles DHCP static leases. This weakness allows authenticated users with dashboard privileges to execute arbitrary commands remotely. The potential impact includes unauthorized system access and compromise of data integrity.

  • Vulnerable: Pi-hole Web interface
  • Flaw: Remote code execution via DHCP lease
  • Impact: Unauthorized system access, data compromise

Attack Path

How an attacker could exploit the issue

Pi-hole's web interface presents an avenue for attackers. A privileged user with dashboard access is required to initiate the attack. This vulnerability allows an attacker to execute remote code by crafting a DHCP static lease.

  • Exposure condition: Unspecified, but requires privileged dashboard access.
  • Attacker starting point: Authenticated privileged user.
  • Trigger and result: Crafted DHCP lease leads to remote code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to execute arbitrary code on affected systems. Organizations using specific versions of Pi-hole's AdminLTE interface are at risk if administrative access is compromised. Exploitation could lead to significant business disruption and data compromise.

  • Attacker skill: Privileged user
  • Access required: Network access, admin credentials
  • Business risk: High urgency

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability allows for remote code execution by authenticated users through a crafted DHCP static lease. Organizations that utilize Pi-hole Web version 4.3.2 or earlier should take immediate steps to identify and mitigate this risk. Addressing this vulnerability is critical to protecting against unauthorized access and potential system compromise.

  • Find Pi-hole Web installations.
  • Isolate affected systems.
  • Update Pi-hole and verify.
  • Monitor for related issues.

Frequently asked questions

What is Pi-hole Web v4.3.2 used for?

Pi-hole Web, also known as AdminLTE, is a web interface for Pi-hole, a network-wide ad blocker. It is used to manage and monitor network traffic, block ads, and control DNS settings for a local network.

What is CVE-2020-8816 and what type of weakness is it?

CVE-2020-8816 is a remote code execution vulnerability affecting Pi-hole Web v4.3.2. It is categorized as CWE-78, which involves improper neutralization of special elements, leading to OS command injection.

How is CVE-2020-8816 triggered?

This vulnerability is triggered when a privileged user with dashboard access crafts a specific DHCP static lease. It's important to note that unauthenticated access or access without dashboard privileges does not trigger the bug.

Who should care about this Pi-hole vulnerability based on Halo Surface Signal?

Organizations running Pi-hole within their internal private networks should care. While typically not internet-facing, if the Pi-hole web dashboard has been exposed externally, the risk increases significantly.

What are the first steps for addressing this Pi-hole vulnerability?

First, identify all installations of Pi-hole Web v4.3.2 or earlier. Then, consider isolating affected systems if immediate updates aren't possible, and prioritize updating Pi-hole to a patched version.

References