Ubuntu Security Notice USN-5658-1

==========================================================================
Ubuntu Security Notice USN-5658-1
October 05, 2022

isc-dhcp vulnerabilities
==========================================================================

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

– Ubuntu 22.04 LTS
– Ubuntu 20.04 LTS
– Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in DHCP.

Software Description:
– isc-dhcp: DHCP server and client

Details:

It was discovered that DHCP incorrectly handled option reference counting.
A remote attacker could possibly use this issue to cause DHCP servers to
crash, resulting in a denial of service. (CVE-2022-2928)

It was discovered that DHCP incorrectly handled certain memory operations.
A remote attacker could possibly use this issue to cause DHCP clients and
servers to consume resources, leading to a denial of service.
(CVE-2022-2929)

Update instructions:

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

Ubuntu 22.04 LTS:
isc-dhcp-client 4.4.1-2.3ubuntu2.3
isc-dhcp-server 4.4.1-2.3ubuntu2.3

Ubuntu 20.04 LTS:
isc-dhcp-client 4.4.1-2.1ubuntu5.20.04.4
isc-dhcp-server 4.4.1-2.1ubuntu5.20.04.4

Ubuntu 18.04 LTS:
isc-dhcp-client 4.3.5-3ubuntu7.4
isc-dhcp-server 4.3.5-3ubuntu7.4

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5658-1
CVE-2022-2928, CVE-2022-2929

Package Information:
https://launchpad.net/ubuntu/+source/isc-dhcp/4.4.1-2.3ubuntu2.3
https://launchpad.net/ubuntu/+source/isc-dhcp/4.4.1-2.1ubuntu5.20.04.4
https://launchpad.net/ubuntu/+source/isc-dhcp/4.3.5-3ubuntu7.4