USN-3586-1: DHCP vulnerabilities
1 March 2018
Several security issues were fixed in DHCP.
Releases
Packages
- isc-dhcp - DHCP server and client
Details
Konstantin Orekhov discovered that the DHCP server incorrectly handled a
large number of concurrent TCP sessions. A remote attacker could possibly
use this issue to cause a denial of service. This issue only affected
Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-2774)
It was discovered that the DHCP server incorrectly handled socket
descriptors. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2017-3144)
Felix Wilhelm discovered that the DHCP client incorrectly handled certain
malformed responses. A remote attacker could use this issue to cause the
DHCP client to crash, resulting in a denial of service, or possibly execute
arbitrary code. In the default installation, attackers would be isolated by
the dhclient AppArmor profile. (CVE-2018-5732)
Felix Wilhelm discovered that the DHCP server incorrectly handled reference
counting. A remote attacker could possibly use this issue to cause the DHCP
server to crash, resulting in a denial of service. (CVE-2018-5733)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 17.10
-
isc-dhcp-client
-
4.3.5-3ubuntu2.2
-
isc-dhcp-relay
-
4.3.5-3ubuntu2.2
-
isc-dhcp-server
-
4.3.5-3ubuntu2.2
-
isc-dhcp-server-ldap
-
4.3.5-3ubuntu2.2
Ubuntu 16.04
-
isc-dhcp-client
-
4.3.3-5ubuntu12.9
-
isc-dhcp-relay
-
4.3.3-5ubuntu12.9
-
isc-dhcp-server
-
4.3.3-5ubuntu12.9
-
isc-dhcp-server-ldap
-
4.3.3-5ubuntu12.9
Ubuntu 14.04
-
isc-dhcp-client
-
4.2.4-7ubuntu12.12
-
isc-dhcp-relay
-
4.2.4-7ubuntu12.12
-
isc-dhcp-server
-
4.2.4-7ubuntu12.12
-
isc-dhcp-server-ldap
-
4.2.4-7ubuntu12.12
In general, a standard system update will make all the necessary changes.
References
Related notices
- USN-3586-2: isc-dhcp, isc-dhcp-relay, isc-dhcp-client, isc-dhcp-server-ldap, isc-dhcp-server