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USN-4969-2: DHCP vulnerability

27 May 2021

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




USN-4969-1 fixed a vulnerability in DHCP. This update provides
the corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.

Original advisory details:

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 16.04
Ubuntu 14.04

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


Related notices

  • USN-4969-1: isc-dhcp-client-udeb, isc-dhcp-client, isc-dhcp-dev, isc-dhcp-relay, isc-dhcp-common, isc-dhcp-client-ddns, isc-dhcp-server, isc-dhcp, isc-dhcp-server-ldap