USN-2868-1: DHCP vulnerability

Releases

• Ubuntu 15.10
• Ubuntu 15.04
• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

• isc-dhcp - DHCP server and client

Details

Sebastian Poehn discovered that the DHCP server, client, and relay
incorrectly handled certain malformed UDP packets. A remote attacker could
use this issue to cause the DHCP server, client, or relay to stop
responding, resulting in a denial of service.

Update instructions

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

Ubuntu 15.10

• isc-dhcp-client - 4.3.1-5ubuntu3.1
• isc-dhcp-relay - 4.3.1-5ubuntu3.1
• isc-dhcp-server - 4.3.1-5ubuntu3.1
• isc-dhcp-server-ldap - 4.3.1-5ubuntu3.1

Ubuntu 15.04

• isc-dhcp-client - 4.3.1-5ubuntu2.3
• isc-dhcp-relay - 4.3.1-5ubuntu2.3
• isc-dhcp-server - 4.3.1-5ubuntu2.3
• isc-dhcp-server-ldap - 4.3.1-5ubuntu2.3

Ubuntu 14.04

• isc-dhcp-client - 4.2.4-7ubuntu12.4
• isc-dhcp-relay - 4.2.4-7ubuntu12.4
• isc-dhcp-server - 4.2.4-7ubuntu12.4
• isc-dhcp-server-ldap - 4.2.4-7ubuntu12.4

Ubuntu 12.04

• isc-dhcp-client - 4.1.ESV-R4-0ubuntu5.10
• isc-dhcp-relay - 4.1.ESV-R4-0ubuntu5.10
• isc-dhcp-server - 4.1.ESV-R4-0ubuntu5.10
• isc-dhcp-server-ldap - 4.1.ESV-R4-0ubuntu5.10

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

References

• CVE-2015-8605