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Ubuntu Security Notice USN-6657-2

Ubuntu Security Notice USN-6657-2
Posted Apr 25, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6657-2 - USN-6657-1 fixed several vulnerabilities in Dnsmasq. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered that Dnsmasq incorrectly 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. 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.

tags | advisory, remote, denial of service, udp, vulnerability
systems | linux, ubuntu
advisories | CVE-2023-28450, CVE-2023-50387, CVE-2023-50868
SHA-256 | 1fe74e528f9c677caecbbdfcd678431e4752e4565e8a9eb7cd614192a3dcc6e0

Ubuntu Security Notice USN-6657-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-6657-2
April 24, 2024

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

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

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in Dnsmasq.

Software Description:
- 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 LTS (Available with Ubuntu Pro):
dnsmasq-base 2.90-0ubuntu0.18.04.1+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
dnsmasq-base 2.90-0ubuntu0.16.04.1+esm1

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-6657-2
https://ubuntu.com/security/notices/USN-6657-1
CVE-2023-28450, CVE-2023-50387, CVE-2023-50868
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