Debian Long Term Support / LTS Security Information / 2019 / Security Information -- DLA-1676-1 unbound

Debian Security Advisory

DLA-1676-1 unbound -- LTS security update

Date Reported:

14 Feb 2019

Affected Packages:

unbound

Vulnerable:

Yes

Security database references:

In the Debian bugtracking system: Bug 887733.
In Mitre's CVE dictionary: CVE-2017-15105.

More information:

Ralph Dolmans and Karst Koymans found a flaw in the way unbound, a validating, recursive, caching DNS resolver, validated wildcard-synthesized NSEC records.

An improperly validated wildcard NSEC record could be used to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick unbound into accepting a NODATA proof.

For more information please refer to the upstream advisory at https://unbound.net/downloads/CVE-2017-15105.txt.

For Debian 8 Jessie, this problem has been fixed in version 1.4.22-3+deb8u4.

We recommend that you upgrade your unbound packages.

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