USN-5658-1: DHCP vulnerabilities

Releases

• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• 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

• isc-dhcp-client - 4.4.1-2.3ubuntu2.3
• isc-dhcp-server - 4.4.1-2.3ubuntu2.3

Ubuntu 20.04

• 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

• 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

• CVE-2022-2929
• CVE-2022-2928

Related notices

• USN-5658-2: isc-dhcp, isc-dhcp-client, isc-dhcp-server-ldap, isc-dhcp-relay, isc-dhcp-client-ddns, isc-dhcp-dev, isc-dhcp-server, isc-dhcp-common
• USN-5658-3: isc-dhcp, isc-dhcp-client, isc-dhcp-server-ldap, isc-dhcp-server, isc-dhcp-relay, isc-dhcp-dev, isc-dhcp-client-noddns, isc-dhcp-common