Resource Management Errors Affecting openssh package, versions <1:7.3p1-2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-OPENSSH-1555797
- published9 Dec 2016
- disclosed9 Dec 2016
Introduced: 9 Dec 2016
CVE-2016-8858 (opens in a new tab)How to fix?
Upgrade Debian:12 openssh to version 1:7.3p1-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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."
References
- https://security-tracker.debian.org/tracker/CVE-2016-8858
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc
- https://security.gentoo.org/glsa/201612-18
- https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad
- https://github.com/dag-erling/kexkill/issues/1
- 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
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig
- https://security.netapp.com/advisory/ntap-20180201-0001/
- http://www.openwall.com/lists/oss-security/2016/10/19/3
- http://www.openwall.com/lists/oss-security/2016/10/20/1
- https://bugzilla.redhat.com/show_bug.cgi?id=1384860
- http://www.securityfocus.com/bid/93776
- http://www.securitytracker.com/id/1037057
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf