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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.

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Releases

Packages

Details

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.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

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.

References

Related notices

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