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Ubuntu Security Update USN-3586-1: DHCP vulnerabilities

Discussion in 'Linux Security Announcements (Automated)' started by LinuxBot, Mar 6, 2018.

  1. LinuxBot

    LinuxBot Moderator
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    isc-dhcp vulnerabilities




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

    • Ubuntu 17.10
    • Ubuntu 16.04 LTS
    • Ubuntu 14.04 LTS
    Summary


    Several security issues were fixed in DHCP.

    Software Description

    • 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 LTS
    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 LTS
    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

    To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

    References


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