National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2016-8858 Detail

Description

** 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."

Source:  MITRE
Description Last Modified:  12/09/2016

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.5 HIGH
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (V3 legend)
Impact Score: 3.6
Exploitability Score: 3.9


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 7.8 HIGH
Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:C) (V2 legend)
Impact Subscore: 6.9
Exploitability Subscore: 10.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Complete
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=h Issue Tracking Vendor Advisory
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markup Issue Tracking Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/10/19/3 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/10/20/1 Mailing List Third Party Advisory
http://www.securityfocus.com/bid/93776 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1037057
https://bugzilla.redhat.com/show_bug.cgi?id=1384860 Issue Tracking
https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig Patch Vendor Advisory
https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad Issue Tracking Patch Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc
https://security.gentoo.org/glsa/201612-18
https://security.netapp.com/advisory/ntap-20180201-0001/

Technical Details

Vulnerability Type (View All)

  • Resource Management Errors (CWE-399)

Vulnerable software and versions Switch to CPE 2.2

Configuration 1
OR
cpe:2.3:a:openbsd:openssh:6.0:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.0:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.1:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.1:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.2:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.2:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.2:p2:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.3:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.3:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.4:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.4:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.5:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.5:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.6:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.6:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.7:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.7:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.8:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.8:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.9:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:6.9:p1:*:*:*:*:*:*
Configuration 2
OR
cpe:2.3:a:openbsd:openssh:7.0:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:7.0:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:7.1:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:7.1:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:7.1:p2:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:7.2:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:7.2:p1:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:7.2:p2:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:7.3:*:*:*:*:*:*:*
cpe:2.3:a:openbsd:openssh:7.3:p1:*:*:*:*:*:*

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

5 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2016-8858
NVD Published Date:
12/09/2016
NVD Last Modified:
02/03/2018