USN-6657-2: Dnsmasq vulnerabilities
24 April 2024
Several security issues were fixed in Dnsmasq.
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)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04
-
dnsmasq-base
-
2.90-0ubuntu0.18.04.1+esm1
Available with Ubuntu Pro
Ubuntu 16.04
-
dnsmasq-base
-
2.90-0ubuntu0.16.04.1+esm1
Available with Ubuntu Pro
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, bind9-libs, bind9-host, bind9utils, bind9-dnsutils, bind9-doc, bind9-utils, dnsutils, bind9-dev
- USN-6642-1: bind9, bind9-libs, bind9-host, bind9utils, bind9-dnsutils, bind9-doc, bind9-utils, dnsutils
- USN-6657-1: dnsmasq, dnsmasq-base, dnsmasq-utils, dnsmasq-base-lua
- USN-6665-1: libunbound-dev, unbound-anchor, python-unbound, python3-unbound, unbound-host, unbound, libunbound8
- USN-6723-1: libdns1100, liblwres90, libbind-export-dev, bind9-doc, libisc95, libirs160, libisc169, libisccc90, liblwres141, libisccc-export140-udeb, libisccfg-export160, libisccfg90, libbind-dev, libisccfg-export140, libirs-export160, liblwres160, libbind9-140, libdns-export1100, libisccc-export140, libisccc140, libisccfg160, bind9-host, libisccc-export160, libisc-export160, libdns-export162, libirs-export141, host, libdns100, libisc160, bind9, libisccc160, libisccfg140, bind9utils, libirs141, libisc-export169, lwresd, dnsutils, libdns162, libbind9-160, libbind9-90
- USN-6034-1: dnsmasq, dnsmasq-base, dnsmasq-utils, dnsmasq-base-lua