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USN-6665-1: Unbound vulnerabilities

28 February 2024

Several security issues were fixed in Unbound.

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Releases

Packages

  • unbound - validating, recursive, caching DNS resolver

Details

Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered
that Unbound incorrectly handled validating DNSSEC messages. A remote
attacker could possibly use this issue to cause Unbound to consume
resources, leading to a denial of service. (CVE-2023-50387)

It was discovered that Unbound incorrectly handled preparing an NSEC3
closest encloser proof. A remote attacker could possibly use this issue to
cause Unbound to consume resources, leading to a denial of service.
(CVE-2023-50868)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 23.10
Ubuntu 22.04
Ubuntu 20.04

In general, a standard system update will make all the necessary changes.

Related notices

  • USN-6633-1: bind9, bind9-libs, bind9-utils, bind9-dev, dnsutils, bind9-dnsutils, bind9-doc, bind9utils, bind9-host
  • USN-6642-1: bind9, bind9-libs, bind9-utils, dnsutils, bind9-dnsutils, bind9-doc, bind9utils, bind9-host
  • USN-6657-1: dnsmasq-utils, dnsmasq-base-lua, dnsmasq-base, dnsmasq
  • USN-6723-1: libirs-export160, libisccfg90, libisccc160, libirs160, libisccc-export140-udeb, libbind-export-dev, libisc160, libisccc-export140, libdns162, bind9utils, libisc95, libisccc140, libisccfg-export140, liblwres90, libisccc90, libisccc-export160, libirs141, liblwres160, bind9-doc, host, libdns-export162, libdns-export1100, bind9-host, libisccfg140, bind9, libisccfg-export160, liblwres141, libisc-export160, lwresd, libbind-dev, libisc-export169, libirs-export141, libdns1100, dnsutils, libisccfg160, libbind9-160, libbind9-90, libisc169, libbind9-140, libdns100