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Ubuntu 21.04: USN-4969-3 Moderate: isc-dhcp DoS Regression Issue

ubuntu
Calendar Grey June 7, 2021
Dist Ubuntu Esm H88
This revision resolves a significant problem in isc-dhcp where the configuration files were being improperly denied, addressing an issue that emerged due to prior changes.
USN-4969-1 introduced a regression in DHCP.

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.

Topics%20covered

Topics Covered

security advisory DoS Ubuntu regression issue isc-dhcp

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-4969-1

https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1930917

Severity
important
Lowest
Low
Medium
High
Critical

June 07, 2021

Topics%20covered

Topics Covered

security advisory DoS Ubuntu regression issue isc-dhcp

Package Information

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

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