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