Debian LTS: DLA-2556-1 Moderate: Unbound Network Attack Fix

Unbound has Insufficient Control of Network Message
Volume, aka an "NXNSAttack" issue. This is triggered by random
subdomains in the NSDNAME in NS records.

CVE-2020-12663

Unbound has an infinite loop via malformed DNS answers received from
upstream servers.

CVE-2020-28935

Unbound contains a local vulnerability that would allow for a local symlink
attack. When writing the PID file Unbound creates the file if it is not
there, or opens an existing file for writing. In case the file was already
present, it would follow symlinks if the file happened to be a symlink
instead of a regular file.

For Debian 9 stretch, these problems have been fixed in version
1.9.0-2+deb10u2~deb9u1.

We recommend that you upgrade your unbound1.9 packages.

For the detailed security status of unbound1.9 please refer to
its security tracker page at:

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be