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Ubuntu Security Notice USN-4969-3

Ubuntu Security Notice USN-4969-3
Posted Jun 7, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4969-3 - 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. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
MD5 | 9fe00e0f535c93884b6a5a03be92540a

Ubuntu Security Notice USN-4969-3

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4969-3
June 07, 2021

isc-dhcp regression
==========================================================================

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

- Ubuntu 21.04

Summary:

USN-4969-1 introduced a regression in DHCP.

Software Description:
- 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.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.04:
isc-dhcp-client 4.4.1-2.2ubuntu6.2
isc-dhcp-server 4.4.1-2.2ubuntu6.2

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-4969-3
https://ubuntu.com/security/notices/USN-4969-1
https://launchpad.net/bugs/1930917

Package Information:
https://launchpad.net/ubuntu/+source/isc-dhcp/4.4.1-2.2ubuntu6.2
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