Your submission was sent successfully! Close

You have successfully unsubscribed! Close

CVE-2019-16905

Published: 9 October 2019

OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-authentication integer overflow if a client or server is configured to use a crafted XMSS key. This leads to memory corruption and local code execution because of an error in the XMSS key parsing algorithm. NOTE: the XMSS implementation is considered experimental in all released OpenSSH versions, and there is no supported way to enable it when building portable OpenSSH.

Notes

AuthorNote
mdeslaur
code isn't built in Ubuntu packages

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
openssh
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
disco Not vulnerable
(code not built)
precise Not vulnerable
(code not present)
trusty Not vulnerable
(code not present)
upstream Needs triage

xenial Not vulnerable
(code not present)
Patches:
upstream: https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshkey-xmss.c.diff?r1=1.5&r2=1.6&f=h
openssh-ssh1
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
disco Not vulnerable
(code not present)
precise Does not exist

trusty Does not exist

upstream Ignored
(frozen on openssh 7.5p)
xenial Does not exist

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H