USN-4969-3: DHCP regression
7 June 2021
USN-4969-1 introduced a regression in DHCP.
- isc-dhcp - DHCP server and client
USN-4969-1 fixed a vulnerability in DHCP. The package for Ubuntu 21.04
introduced a regression causing it to reject certain valid configuration
files. This update fixes the problem.
We apologize for the inconvenience.
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.