Advisory Published

USN-3586-1: DHCP vulnerabilities

First published: Thu Mar 01 2018(Updated: )

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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/isc-dhcp-client<4.3.5-3ubuntu2.2
4.3.5-3ubuntu2.2
=17.10
All of
ubuntu/isc-dhcp-relay<4.3.5-3ubuntu2.2
4.3.5-3ubuntu2.2
=17.10
All of
ubuntu/isc-dhcp-server<4.3.5-3ubuntu2.2
4.3.5-3ubuntu2.2
=17.10
All of
ubuntu/isc-dhcp-server-ldap<4.3.5-3ubuntu2.2
4.3.5-3ubuntu2.2
=17.10
All of
ubuntu/isc-dhcp-client<4.3.3-5ubuntu12.9
4.3.3-5ubuntu12.9
=16.04
All of
ubuntu/isc-dhcp-relay<4.3.3-5ubuntu12.9
4.3.3-5ubuntu12.9
=16.04
All of
ubuntu/isc-dhcp-server<4.3.3-5ubuntu12.9
4.3.3-5ubuntu12.9
=16.04
All of
ubuntu/isc-dhcp-server-ldap<4.3.3-5ubuntu12.9
4.3.3-5ubuntu12.9
=16.04
All of
ubuntu/isc-dhcp-client<4.2.4-7ubuntu12.12
4.2.4-7ubuntu12.12
=14.04
All of
ubuntu/isc-dhcp-relay<4.2.4-7ubuntu12.12
4.2.4-7ubuntu12.12
=14.04
All of
ubuntu/isc-dhcp-server<4.2.4-7ubuntu12.12
4.2.4-7ubuntu12.12
=14.04
All of
ubuntu/isc-dhcp-server-ldap<4.2.4-7ubuntu12.12
4.2.4-7ubuntu12.12
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-3586-1?

    The severity of USN-3586-1 is medium.

  • How does the DHCP server vulnerability in USN-3586-1 affect Ubuntu 14.04 LTS and Ubuntu 16.04 LTS?

    The DHCP server vulnerability in USN-3586-1 causes a denial of service, but it only affects Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.

  • How can a remote attacker exploit the DHCP server vulnerability mentioned in USN-3586-1?

    A remote attacker can exploit the DHCP server vulnerability to cause a denial of service.

  • Which software packages are affected by the DHCP vulnerabilities in USN-3586-1?

    The affected software packages are isc-dhcp-client, isc-dhcp-relay, isc-dhcp-server, and isc-dhcp-server-ldap.

  • How can I fix the DHCP vulnerabilities mentioned in USN-3586-1?

    To fix the DHCP vulnerabilities, update the affected software packages to the specified versions.

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