Vulnerability Monitor

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CVE-2016-8858

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."

Published

2016-12-09T11:59:00.207

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: COMPLETE

Exploitability Score

10.0

Impact Score

6.9

Weaknesses

Type: Primary
CWE-399

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	openbsd	openssh	6.8	Yes
Application	openbsd	openssh	6.9	Yes
Application	openbsd	openssh	7.0	Yes
Application	openbsd	openssh	7.1	Yes
Application	openbsd	openssh	7.2	Yes
Application	openbsd	openssh	7.3	Yes

References

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 ([email protected])
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 ([email protected])
http://www.openwall.com/lists/oss-security/2016/10/19/3 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2016/10/20/1 Mailing List, Third Party Advisory ([email protected])
http://www.securityfocus.com/bid/93776 Third Party Advisory, VDB Entry ([email protected])
http://www.securitytracker.com/id/1037057 Third Party Advisory, VDB Entry ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=1384860 Issue Tracking ([email protected])
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf ([email protected])
https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig Patch, Vendor Advisory ([email protected])
https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad Issue Tracking, Patch, Third Party Advisory ([email protected])
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc Third Party Advisory ([email protected])
https://security.gentoo.org/glsa/201612-18 Third Party Advisory ([email protected])
https://security.netapp.com/advisory/ntap-20180201-0001/ Third Party Advisory ([email protected])
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 (af854a3a-2127-422b-91ae-364da2661108)
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 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2016/10/19/3 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2016/10/20/1 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/93776 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1037057 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=1384860 Issue Tracking (af854a3a-2127-422b-91ae-364da2661108)
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf (af854a3a-2127-422b-91ae-364da2661108)
https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad Issue Tracking, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201612-18 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20180201-0001/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)