CVE-2018-14663: powerdns dnsdist Improper Input Validation

Vulnerability summary

CVE-2018-14663 is a medium (CVSS 5.9) Improper Input Validation vulnerability in powerdns dnsdist. EPSS estimates a 2.57% chance of exploitation in the next 30 days, higher than 84.9% of scored vulnerabilities.

Timeline

1. 26-11-2018
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

An issue has been found in PowerDNS DNSDist before 1.3.3 allowing a remote attacker to craft a DNS query with trailing data such that the addition of a record by dnsdist, for example an OPT record when adding EDNS Client Subnet, might result in the trailing data being smuggled to the backend as a valid record while not seen by dnsdist. This is an issue when dnsdist is deployed as a DNS Firewall and used to filter some records that should not be received by the backend. This issue occurs only when either the 'useClientSubnet' or the experimental 'addXPF' parameters are used when declaring a new backend.

• CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.