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