#VU28142 Input validation error in PowerDNS Recursor - CVE-2020-12244
Published: May 20, 2020
Vulnerability identifier: #VU28142
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2020-12244
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
PowerDNS Recursor
PowerDNS Recursor
Software vendor:
PowerDNS.COM B.V.
PowerDNS.COM B.V.
Description
The vulnerability allows a remote attacker to perform a spoofing attack.
The vulnerability exists due to records in the answer section of a NXDOMAIN response lacking an SOA are not properly validated in SyncRes::processAnswer. A remote attacker with ability to perform a Man-in-the-Middle (MitM) attack can send a NXDOMAIN answer for a name that does exist and bypass DNSSEC validation.
Successful exploitation of the vulnerability may allow an attacker to perform a spoofing attack.
Remediation
Install updates from vendor's website.