pdns-recursor: Multiple vulnerabilities(CVE-2020-10995, CVE-2020-12244)

CVE-2020-10995: Denial of Service.

An issue in the DNS protocol has been found that allows malicious parties to use recursive DNS services to attack third party authoritative name servers.

Affected Versions:

PowerDNS Recursor from 4.1.0 up to and including 4.3.0.

Fixed In Version:

PowerDNS Recursor 4.3.1, 4.2.2. and 4.1.16

References:

• https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-01.html
• https://www.openwall.com/lists/oss-security/2020/05/19/3

CVE-2020-12244: Insufficient validation of DNSSEC signatures.

An issue has been found in PowerDNS Recursor 4.1.0 through 4.3.0 where records in the answer section of a NXDOMAIN response lacking an SOA were not properly validated in SyncRes::processAnswer. This would allow an attacker in position of man-in-the-middle to send a NXDOMAIN answer for a name that does exist, bypassing DNSSEC validation.

Fixed In Version:

PowerDNS Recursor 4.3.1, 4.2.2. and 4.1.16

References:

• https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-02.html
• https://www.openwall.com/lists/oss-security/2020/05/19/3

Affected branches:

• master
• 3.11-stable