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Ubuntu Security Notice USN-3973-1
May 13, 2019

isc-dhcp vulnerability
==========================================================================

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

– Ubuntu 18.10
– Ubuntu 18.04 LTS

Summary:

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

Software Description:
– isc-dhcp: DHCP server and client

Details:

It was discovered that DHCP, when built with a mismatched external BIND
library, incorrectly handled certain memory operations. 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 18.10:
isc-dhcp-server 4.3.5-3ubuntu9.1

Ubuntu 18.04 LTS:
isc-dhcp-server 4.3.5-3ubuntu7.1

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

References:
https://usn.ubuntu.com/usn/usn-3973-1
CVE-2019-6470

Package Information:
https://launchpad.net/ubuntu/+source/isc-dhcp/4.3.5-3ubuntu9.1
https://launchpad.net/ubuntu/+source/isc-dhcp/4.3.5-3ubuntu7.1

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