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USN-6657-2: Dnsmasq vulnerabilities

24 April 2024

Several security issues were fixed in Dnsmasq.

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Releases

Packages

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

Details

USN-6657-1 fixed several vulnerabilities in Dnsmasq. This update provides
the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory 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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Update instructions

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

Ubuntu 18.04
Ubuntu 16.04

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

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Further reading