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
Author | Note |
---|---|
mdeslaur | DoS over OMAPI and failover ports only, see ISC kb article for workarounds, or properly limit access to ports |
Priority
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 |