Vulnerability-Lookup

GHSA-CFX4-R6F2-M2MC

Vulnerability from github – Published: 2022-05-14 02:58 – Updated: 2024-03-21 03:33

Details

** 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."

Severity

7.5 (High)


                  
                    CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2016-8858"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2016-12-09T11:59:00Z",
    "severity": "HIGH"
  },
  "details": "** 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.\"",
  "id": "GHSA-cfx4-r6f2-m2mc",
  "modified": "2024-03-21T03:33:12Z",
  "published": "2022-05-14T02:58:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-8858"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dag-erling/kexkill/issues/1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1384860"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"
    },
    {
      "type": "WEB",
      "url": "https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig"
    },
    {
      "type": "WEB",
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/201612-18"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20180201-0001"
    },
    {
      "type": "WEB",
      "url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126\u0026r2=1.127\u0026f=h"
    },
    {
      "type": "WEB",
      "url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127\u0026content-type=text/x-cvsweb-markup"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2016/10/19/3"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2016/10/20/1"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/93776"
    },
    {
      "type": "WEB",
      "url": "http://www.securitytracker.com/id/1037057"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2016-8858 (GCVE-0-2016-8858)

Vulnerability from cvelistv5 – Published: 2016-12-09 00:00 – Updated: 2026-05-29 20:45 Disputed

Summary

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."

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-04-15 16:36 UTC

CWE

n/a
CWE-400 - Uncontrolled Resource Consumption

Assigner

mitre mitre root

References

13 references

URL	Tags
http://www.securityfocus.com/bid/93776	vdb-entry
http://www.openwall.com/lists/oss-security/2016/10/20/1	mailing-list
https://security.netapp.com/advisory/ntap-2018020…
http://www.openwall.com/lists/oss-security/2016/10/19/3	mailing-list
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.…
https://github.com/openssh/openssh-portable/commi…
https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/c…
https://security.FreeBSD.org/advisories/FreeBSD-S…	vendor-advisory
http://www.securitytracker.com/id/1037057	vdb-entry
https://security.gentoo.org/glsa/201612-18	vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1384860
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.…
https://cert-portal.siemens.com/productcert/pdf/s…

Date Public

2016-10-10 00:00

Show details on NVD website

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          "dateUpdated": "2024-08-06T02:35:01.046Z",
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            "url": "http://www.openwall.com/lists/oss-security/2016/10/20/1"
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            "url": "https://security.netapp.com/advisory/ntap-20180201-0001/"
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            "tags": [
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            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"
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        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
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            "other": {
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                "options": [
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                  {
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                "timestamp": "2024-04-15T16:36:39.938823Z",
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                "cweId": "CWE-400",
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        },
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    ],
    "cna": {
      "affected": [
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      ],
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          "tags": [
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        {
          "name": "[oss-security] 20161020 Re: Re: CVE Request: OpenSSH: Memory exhaustion issue found in OpenSSH",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2016/10/20/1"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20180201-0001/"
        },
        {
          "name": "[oss-security] 20161019 CVE Request: OpenSSH: Memory exhaustion issue found in OpenSSH",
          "tags": [
            "mailing-list"
          ],
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        },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.