Debian: DSA-4691-1 Critical Update for PDNS Recursor Security Flaws

Two vulnerabiliites have been discovered in PDNS Recursor, a resolving
name server; a traffic amplification attack against third party
authoritative name servers (NXNSAttack) and insufficient validation of
NXDOMAIN responses lacking an SOA.

The version of pdns-recursor in the oldstable distribution (stretch) is
no longer supported. If these security issues affect your setup, you
should upgrade to the stable distribution (buster).

For the stable distribution (buster), these problems have been fixed in
version 4.1.11-1+deb10u1.

We recommend that you upgrade your pdns-recursor packages.

For the detailed security status of pdns-recursor please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/pdns-recursor

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/