Input validation error in PowerDNS Recursor - CVE-2020-25829

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Main Vulnerability Database Vulnerabilities #VU47532

Input validation error in PowerDNS Recursor - CVE-2020-25829

Published: October 13, 2020


Vulnerability identifier: #VU47532
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-25829
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform cache poisoning attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause the cached records for a given name to be updated to the ‘Bogus’ DNSSEC validation state, instead of their actual DNSSEC ‘Secure’ state, via a DNS ANY query. This results in a denial of service for installations that always validate (dnssec=validate) and for clients requesting validation when on-demand validation is enabled (dnssec=process).


Affected software

PowerDNS Recursor
Arch Linux
Gentoo Linux
Fedora
SUSE Linux
Opensuse
pdns-recursor (Alpine package)
pdns-recursor
SUSE Package Hub for SUSE Linux Enterprise

How to mitigate CVE-2020-25829

Install updates from vendor's website.

PowerDNS Recursor - addressed in versions 4.1.18, 4.2.5, 4.3.5
pdns-recursor - addressed in versions 4.3.5-1.el8, 4.3.5-1.fc32

External References

Related Security Bulletins