Vulnerability identifier: #VU28142

Vulnerability risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-12244

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PowerDNS Recursor
Server applications / DNS servers

Vendor: 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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

PowerDNS Recursor: 4.3.0 - 4.3.0 rc2, 4.2.0 - 4.2.1, 4.1.0 - 4.1.15

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External links
http://www.openwall.com/lists/oss-security/2020/05/19/3
http://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-02.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.