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      Last Modified:  12/09/2016

Quick Info

CVE Dictionary Entry:
CVE-2016-8858
Original release date:
12/09/2016
Last revised:
02/03/2018
Source:
US-CERT/NIST

Impact

CVSS Severity (version 3.0):
CVSS v3 Base Score:
7.5 High
Vector:
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (legend)
Impact Score:
3.6
Exploitability Score:
3.9
CVSS Version 3 Metrics:
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 Severity (version 2.0):
CVSS v2 Base Score:
7.8 HIGH
Vector:
(AV:N/AC:L/Au:N/C:N/I:N/A:C) (legend)
Impact Subscore:
6.9
Exploitability Subscore:
10.0
CVSS Version 2 Metrics:
Access Vector:
Network exploitable
Access Complexity:
Low
Authentication:
Not required to exploit
Impact Type:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource Type Source Name
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 External Source MISC http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=h
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 External Source MISC http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markup
http://www.openwall.com/lists/oss-security/2016/10/19/3 Mailing List; Third Party Advisory External Source MLIST [oss-security] 20161019 CVE Request: OpenSSH: Memory exhaustion issue found in OpenSSH
http://www.openwall.com/lists/oss-security/2016/10/20/1 Mailing List; Third Party Advisory External Source MLIST [oss-security] 20161020 Re: Re: CVE Request: OpenSSH: Memory exhaustion issue found in OpenSSH
http://www.securityfocus.com/bid/93776 Third Party Advisory; VDB Entry External Source BID 93776
http://www.securitytracker.com/id/1037057 External Source SECTRACK 1037057
https://bugzilla.redhat.com/show_bug.cgi?id=1384860 Issue Tracking External Source MISC https://bugzilla.redhat.com/show_bug.cgi?id=1384860
https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig Patch; Vendor Advisory External Source MISC https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig
https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad Issue Tracking; Patch; Third Party Advisory External Source MISC https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc External Source FREEBSD FreeBSD-SA-16:33
https://security.gentoo.org/glsa/201612-18 External Source GENTOO GLSA-201612-18
https://security.netapp.com/advisory/ntap-20180201-0001/ External Source CONFIRM 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.

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