Alerts This Week
Warning Icon 1 758
Alerts This Week
Warning Icon 1 758

Ubuntu 16.04, 14.04: USN-4969-2 Critical isc-dhcp Denial Of Service

ubuntu
Calendar Grey May 27, 2021
Dist Ubuntu Esm H88
To address the isc-dhcp vulnerability in Ubuntu 14.04 and 16.04, follow these steps to secure your system and prevent denial of service risks
DHCP could be made to crash if it received specially crafted network traffic.

Summary

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

traffic.

Software Description:

- isc-dhcp: DHCP server and client

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.

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu update instructions network issue isc-dhcp

Update Instructions

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

Ubuntu 16.04 ESM:
  isc-dhcp-client                 4.3.3-5ubuntu12.10+esm1
  isc-dhcp-server                 4.3.3-5ubuntu12.10+esm1

Ubuntu 14.04 ESM:
  isc-dhcp-client                 4.2.4-7ubuntu12.13+esm1
  isc-dhcp-server                 4.2.4-7ubuntu12.13+esm1

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

References

https://ubuntu.com/security/notices/USN-4969-2

https://ubuntu.com/security/notices/USN-4969-1

CVE-2021-25217

Severity
critical
Lowest
Low
Medium
High
Critical

May 27, 2021

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu update instructions network issue isc-dhcp

Package Information

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here