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CVE-2016-2774

Published: 9 March 2016

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.

Notes

AuthorNote
mdeslaur
DoS over OMAPI and failover ports only, see ISC kb article
for workarounds, or properly limit access to ports

Priority

Low

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
isc-dhcp
Launchpad, Ubuntu, Debian
artful Not vulnerable
(4.3.5-3ubuntu2)
bionic Not vulnerable
(4.3.5-3ubuntu2)
cosmic Not vulnerable
(4.3.5-3ubuntu2)
disco Not vulnerable
(4.3.5-3ubuntu2)
eoan Not vulnerable
(4.3.5-3ubuntu2)
focal Not vulnerable
(4.3.5-3ubuntu2)
groovy Not vulnerable
(4.3.5-3ubuntu2)
hirsute Not vulnerable
(4.3.5-3ubuntu2)
precise Ignored
(end of life)
trusty
Released (4.2.4-7ubuntu12.12)
upstream
Released (4.3.4)
wily Ignored
(end of life)
xenial
Released (4.3.3-5ubuntu12.9)
yakkety Ignored
(end of life)
zesty Ignored
(end of life)
Patches:
upstream: https://source.isc.org/cgi-bin/gitweb.cgi?p=dhcp.git;a=commit;h=0b209ea5cc333255e055113fa2ad636dda681a21

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H