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CVE-2016-8858

Published: 9 December 2016

** DISPUTED ** The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue."

Notes

AuthorNote
mdeslaur
DoS is limited to attacker's connection only, and openssh
upstream does not consider this to be a security issue
We do not consider this to be a security issue either, marking
as ignored

Priority

Negligible

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
openssh
Launchpad, Ubuntu, Debian
artful Not vulnerable
(1:7.3p1-2)
precise Ignored
(end of life)
trusty Ignored

upstream Needs triage

xenial Ignored

yakkety Ignored
(end of life)
zesty Not vulnerable
(1:7.3p1-2)
Patches:
upstream: https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H