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Ubuntu Security Notice USN-6657-1

Ubuntu Security Notice USN-6657-1
Posted Feb 27, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6657-1 - 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. 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.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2023-28450, CVE-2023-50387, CVE-2023-50868
SHA-256 | 46f1a09bc8e779b0877ec272386957a7de5ad50e209a3024756ed199c3923006

Ubuntu Security Notice USN-6657-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-6657-1
February 26, 2024

dnsmasq vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Dnsmasq.

Software Description:
- 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)

Update instructions:

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

Ubuntu 23.10:
dnsmasq-base 2.90-0ubuntu0.23.10.1

Ubuntu 22.04 LTS:
dnsmasq-base 2.90-0ubuntu0.22.04.1

Ubuntu 20.04 LTS:
dnsmasq-base 2.90-0ubuntu0.20.04.1

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:
https://ubuntu.com/security/notices/USN-6657-1
CVE-2023-28450, CVE-2023-50387, CVE-2023-50868

Package Information:
https://launchpad.net/ubuntu/+source/dnsmasq/2.90-0ubuntu0.23.10.1
https://launchpad.net/ubuntu/+source/dnsmasq/2.90-0ubuntu0.22.04.1
https://launchpad.net/ubuntu/+source/dnsmasq/2.90-0ubuntu0.20.04.1

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