Pi-Hole up to 5.0 piholedhcp settings.php host code injection

Summaryinfo

A vulnerability described as critical has been identified in Pi-Hole up to 5.0. This affects an unknown function of the file settings.php of the component piholedhcp. The manipulation of the argument host as part of Teleporter Backup File results in code injection. This vulnerability is identified as CVE-2020-14971. The attack is only possible with local access. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical has been found in Pi-Hole up to 5.0. Affected is an unknown code block of the file settings.php of the component piholedhcp. The manipulation of the argument host as part of a Teleporter Backup File leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Pi-hole through 5.0 allows code injection in piholedhcp (the Static DHCP Leases section) by modifying Teleporter backup files and then restoring them. This occurs in settings.php. To exploit this, an attacker would request a backup of limited files via teleporter.php. These are placed into a .tar.gz archive. The attacker then modifies the host parameter in dnsmasq.d files, and then compresses and uploads these files again.

The weakness was released 06/23/2020 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2020-14971 since 06/22/2020. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

By approaching the search of inurl:settings.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• Pi-Hole

Version

• 5.0

CPE 2.3info

• 🔍

CPE 2.2info

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