Ubuntu 4969-1: DHCP vulnerability
Summary
Update Instructions
The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: isc-dhcp-client 4.4.1-2.2ubuntu6.1 isc-dhcp-server 4.4.1-2.2ubuntu6.1 Ubuntu 20.10: isc-dhcp-client 4.4.1-2.1ubuntu10.1 isc-dhcp-server 4.4.1-2.1ubuntu10.1 Ubuntu 20.04 LTS: isc-dhcp-client 4.4.1-2.1ubuntu5.20.04.2 isc-dhcp-server 4.4.1-2.1ubuntu5.20.04.2 Ubuntu 18.04 LTS: isc-dhcp-client 4.3.5-3ubuntu7.3 isc-dhcp-server 4.3.5-3ubuntu7.3 In general, a standard system update will make all the necessary changes.
References
https://ubuntu.com/security/notices/USN-4969-1
CVE-2021-25217
Package Information
https://launchpad.net/ubuntu/+source/isc-dhcp/4.4.1-2.2ubuntu6.1 https://launchpad.net/ubuntu/+source/isc-dhcp/4.4.1-2.1ubuntu10.1 https://launchpad.net/ubuntu/+source/isc-dhcp/4.4.1-2.1ubuntu5.20.04.2 https://launchpad.net/ubuntu/+source/isc-dhcp/4.3.5-3ubuntu7.3