Sunday, May 30, 2021

Ubuntu Security Notice USN-4969-1

Ubuntu Security Notice USN-4969-1
May 27, 2021

isc-dhcp vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS


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

Software Description:
- isc-dhcp: DHCP server and client


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:
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.


Package Information:

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thank you Templateism for the design - You should have written the code a little more complicated - Nothing Encrypted anymore