1. Ubuntu Security Notices
  2. USN-4969-2

USN-4969-2: DHCP vulnerability

Publication date

27 May 2021

Overview

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

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.

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

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
16.04 xenial isc-dhcp-client –  4.3.3-5ubuntu12.10+esm1  
isc-dhcp-server –  4.3.3-5ubuntu12.10+esm1  
14.04 trusty isc-dhcp-client –  4.2.4-7ubuntu12.13+esm1  
isc-dhcp-server –  4.2.4-7ubuntu12.13+esm1  

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References

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