Vulnerability Description
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."
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openbsd | Openssh | 6.8 |
Related Weaknesses (CWE)
References
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=Issue TrackingVendor Advisory
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&contentIssue TrackingVendor Advisory
- http://www.openwall.com/lists/oss-security/2016/10/19/3Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2016/10/20/1Mailing ListThird Party Advisory
- http://www.securityfocus.com/bid/93776Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037057Third Party AdvisoryVDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1384860Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sigPatchVendor Advisory
- https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200Issue TrackingPatchThird Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.ascThird Party Advisory
- https://security.gentoo.org/glsa/201612-18Third Party Advisory
- https://security.netapp.com/advisory/ntap-20180201-0001/Third Party Advisory
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=Issue TrackingVendor Advisory
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&contentIssue TrackingVendor Advisory
FAQ
What is CVE-2016-8858?
CVE-2016-8858 is a vulnerability with a CVSS score of 7.5 (HIGH). 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: ...
How severe is CVE-2016-8858?
CVE-2016-8858 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2016-8858?
Check the references section above for vendor advisories and patch information. Affected products include: Openbsd Openssh.