Bug 644710 – <net-dns/pdns-recursor-4.1.1: Insufficient validation of DNSSEC signatures (CVE-2018-1000003)

• Status: RESOLVED FIXED
• Product: Gentoo Security

[Description Thomas Deutschmann (RETIRED) 2018-01-15 22:20:07 UTC]

Incoming details.

[Comment 1 Thomas Deutschmann (RETIRED) 2018-01-22 15:07:47 UTC]

PowerDNS Security Advisory 2018-01: Insufficient validation of DNSSEC signatures¶

CVE: CVE-2018-1000003

Date: January 22nd 2018

Credit: CZ.NIC

Affects: PowerDNS Recursor 4.1.0

Not affected: PowerDNS Recursor < 4.1.0, 4.1.1

Severity: Low

Impact: Denial of existence spoofing

Exploit: This problem can be triggered by an attacker in position of man-in-the-middle

Risk of system compromise: No

Solution: Upgrade to a non-affected version

An issue has been found in the DNSSEC validation component of PowerDNS Recursor, allowing an ancestor delegation NSEC or NSEC3 record to be used to wrongfully prove the non-existence of a RR below the owner name of that record. This would allow an attacker in position of man-in-the-middle to send a NXDOMAIN answer for a name that does exist. This issue has been assigned CVE-2018-1000003.

PowerDNS Recursor 4.1.0 is affected.

[Comment 2 Sven Wegener 2018-01-22 15:09:00 UTC]

I have committed 4.1.1 to the tree and removed the vulnerable 4.1.0.

[Comment 3 Thomas Deutschmann (RETIRED) 2018-01-22 15:12:06 UTC]

Only affects 4.1.0 which wasn't marked stable. Repository is clean. All done!