USN-4969-3: DHCP regression
Publication date
7 June 2021
Overview
USN-4969-1 introduced a regression in DHCP.
Releases
Packages
- isc-dhcp - DHCP server and client
Details
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.
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.
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
Ubuntu Release | Package Version | ||
---|---|---|---|
21.04 hirsute | isc-dhcp-client – 4.4.1-2.2ubuntu6.2 | ||
isc-dhcp-server – 4.4.1-2.2ubuntu6.2 |
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