Ubuntu Security Notice 3973-1 - 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.
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Ubuntu Security Notice USN-3973-1
May 13, 2019
isc-dhcp vulnerability
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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