CVE-2016-8858

Gentoo Linux Security Advisory 201612-18

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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."

** DISPUTADA ** La función kex_input_kexinit en kex.c en OpenSSH 6.x y 7.x hasta la versión 7.3 permite a atacantes remotos provocar una denegación de servicio (consumo de memoria) enviando muchas peticiones duplicadas KEXINIT. NOTA: un tercero reporta que "OpenSSH upstream no considera esto como un problema de seguridad".

Multiple vulnerabilities have been found in OpenSSH, the worst of which allows remote attackers to cause Denial of Service. Versions less than 7.3_p1-r7 are affected.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-10-19 CVE Reserved
2016-12-07 CVE Published
2023-07-11 First Exploit
2024-08-06 CVE Updated
2025-07-04 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-399: Resource Management Errors

CAPEC

References (14)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2016/10/19/3	Mailing List
http://www.openwall.com/lists/oss-security/2016/10/20/1	Mailing List
http://www.securityfocus.com/bid/93776	Third Party Advisory
http://www.securitytracker.com/id/1037057	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1384860	Issue Tracking
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://security.netapp.com/advisory/ntap-20180201-0001	Third Party Advisory

URL	Date	SRC
https://github.com/dag-erling/kexkill	2023-07-11

URL	Date	SRC
https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig	2024-05-17
https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad	2024-05-17

URL	Date	SRC
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=h	2024-05-17
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markup	2024-05-17
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc	2024-05-17
https://security.gentoo.org/glsa/201612-18	2024-05-17

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Openbsd Search vendor "Openbsd"		Openssh Search vendor "Openbsd" for product "Openssh"				6.8 Search vendor "Openbsd" for product "Openssh" and version "6.8"		-		Affected
Openbsd Search vendor "Openbsd"		Openssh Search vendor "Openbsd" for product "Openssh"				6.9 Search vendor "Openbsd" for product "Openssh" and version "6.9"		-		Affected
Openbsd Search vendor "Openbsd"		Openssh Search vendor "Openbsd" for product "Openssh"				7.0 Search vendor "Openbsd" for product "Openssh" and version "7.0"		-		Affected
Openbsd Search vendor "Openbsd"		Openssh Search vendor "Openbsd" for product "Openssh"				7.1 Search vendor "Openbsd" for product "Openssh" and version "7.1"		-		Affected
Openbsd Search vendor "Openbsd"		Openssh Search vendor "Openbsd" for product "Openssh"				7.2 Search vendor "Openbsd" for product "Openssh" and version "7.2"		-		Affected
Openbsd Search vendor "Openbsd"		Openssh Search vendor "Openbsd" for product "Openssh"				7.3 Search vendor "Openbsd" for product "Openssh" and version "7.3"		-		Affected