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USN-6657-1: Dnsmasq vulnerabilities

26 February 2024

Several security issues were fixed in Dnsmasq.

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Releases

Packages

  • dnsmasq - Small caching DNS proxy and DHCP/TFTP server

Details

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

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

It was discovered that Dnsmasq incorrectly set the maximum EDNS.0 UDP
packet size as required by DNS Flag Day 2020. This issue only affected
Ubuntu 23.10. (CVE-2023-28450)

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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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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

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to reboot your computer to
make all the necessary changes.

References

Related notices

  • USN-6633-1: bind9-libs, bind9-doc, bind9-dnsutils, bind9-utils, bind9-host, bind9, bind9-dev, bind9utils, dnsutils
  • USN-6642-1: bind9-libs, bind9-doc, bind9-dnsutils, bind9-utils, bind9-host, bind9, bind9utils, dnsutils
  • USN-6665-1: python-unbound, unbound-anchor, libunbound-dev, unbound, python3-unbound, unbound-host, libunbound8
  • USN-6723-1: liblwres141, libbind9-160, libisccc-export140-udeb, libisc169, libisccfg140, libisc160, libisccc140, bind9utils, libirs-export160, libisccc-export140, libdns-export162, libisccfg160, libisccc160, libdns1100, liblwres90, libisccfg90, libbind-dev, dnsutils, libdns100, libbind-export-dev, libisc95, liblwres160, libisccc90, bind9-host, libirs-export141, lwresd, libdns-export1100, libisc-export160, libirs141, libdns162, libbind9-140, libirs160, bind9-doc, libbind9-90, libisccc-export160, bind9, libisccfg-export140, libisccfg-export160, host, libisc-export169
  • USN-6657-2: dnsmasq-base-lua, dnsmasq-base, dnsmasq, dnsmasq-utils
  • USN-6034-1: dnsmasq-base-lua, dnsmasq-base, dnsmasq, dnsmasq-utils

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Further reading