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USN-4969-1: DHCP vulnerability

27 May 2021

DHCP could be made to crash if it received specially crafted network traffic.




Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly
handled lease file parsing. A remote attacker could possibly use this issue
to cause DHCP to crash, resulting in a denial of service.

Update instructions

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

Ubuntu 21.04
Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04

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


Related notices

  • USN-4969-2: isc-dhcp-client, isc-dhcp, isc-dhcp-client-ddns, isc-dhcp-server-ldap, isc-dhcp-client-udeb, isc-dhcp-server, isc-dhcp-relay, isc-dhcp-dev, isc-dhcp-client-noddns, isc-dhcp-common