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CVE-2016-2774

Status Candidate

Overview

ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.

Related Files

Ubuntu Security Notice USN-3586-1
Posted Mar 1, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3586-1 - 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. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service, tcp
systems | linux, ubuntu
advisories | CVE-2016-2774, CVE-2017-3144, CVE-2018-5732, CVE-2018-5733
MD5 | 08aea38d77f392f613434bd52973ae94
Red Hat Security Advisory 2016-2590-02
Posted Nov 4, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-2590-02 - The Dynamic Host Configuration Protocol is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Security Fix: A resource-consumption flaw was discovered in the DHCP server. dhcpd did not restrict the number of open connections to OMAPI and failover ports. A remote attacker able to establish TCP connections to one of these ports could use this flaw to cause dhcpd to exit unexpectedly, stop responding requests, or exhaust system sockets.

tags | advisory, remote, tcp, protocol
systems | linux, redhat
advisories | CVE-2016-2774
MD5 | fdc54986e8a172eb32b9e90f1ea0be12
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