FKIE_CVE-2015-5600
Vulnerability from fkie_nvd - Published: 2015-08-03 01:59 - Updated: 2026-06-17 00:29
Severity
Summary
The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.
References
{
"affected": [
{
"affectedData": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"source": "cve@mitre.org"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*",
"matchCriteriaId": "27C9A807-7740-4D75-9B01-91ED53D14C40",
"versionEndIncluding": "6.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list."
},
{
"lang": "es",
"value": "Vulnerabilidad en la funci\u00f3n kbdint_next_device en auth2-chall.c en sshd en OpenSSH hasta la versi\u00f3n 6.9, no restringe correctamente el procesamiento de dispositivos de teclado interactivo con una \u00fanica conexi\u00f3n, lo cual facilita a atacantes remotos ejecutar un ataque de fuerza bruta o causar una denegaci\u00f3n de servicio (mediante el consumo de la CPU) a trav\u00e9s de una lista larga y redundante en la opci\u00f3n ssh -oKbdInteractiveDevices, seg\u00fan lo demostrado por una modificaci\u00f3n en el cliente que provee una contrase\u00f1a diferente para cada uno de los elementos pam de la lista."
}
],
"id": "CVE-2015-5600",
"lastModified": "2026-06-17T00:29:25.700",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 8.5,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:C",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 7.8,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 5.9,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2015-5600",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-27T16:31:47.512279Z",
"version": "2.0.3"
}
}
]
},
"published": "2015-08-03T01:59:03.950",
"references": [
{
"source": "cve@mitre.org",
"url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c"
},
{
"source": "cve@mitre.org",
"url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42\u0026r2=1.43\u0026f=h"
},
{
"source": "cve@mitre.org",
"url": "http://kb.juniper.net/InfoCenter/index?page=content\u0026id=JSA10697"
},
{
"source": "cve@mitre.org",
"url": "http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html"
},
{
"source": "cve@mitre.org",
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html"
},
{
"source": "cve@mitre.org",
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html"
},
{
"source": "cve@mitre.org",
"url": "http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html"
},
{
"source": "cve@mitre.org",
"url": "http://openwall.com/lists/oss-security/2015/07/23/4"
},
{
"source": "cve@mitre.org",
"url": "http://rhn.redhat.com/errata/RHSA-2016-0466.html"
},
{
"source": "cve@mitre.org",
"tags": [
"Exploit"
],
"url": "http://seclists.org/fulldisclosure/2015/Jul/92"
},
{
"source": "cve@mitre.org",
"url": "http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html"
},
{
"source": "cve@mitre.org",
"url": "http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html"
},
{
"source": "cve@mitre.org",
"url": "http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html"
},
{
"source": "cve@mitre.org",
"url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html"
},
{
"source": "cve@mitre.org",
"url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html"
},
{
"source": "cve@mitre.org",
"url": "http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html"
},
{
"source": "cve@mitre.org",
"url": "http://www.securityfocus.com/bid/75990"
},
{
"source": "cve@mitre.org",
"url": "http://www.securityfocus.com/bid/91787"
},
{
"source": "cve@mitre.org",
"url": "http://www.securityfocus.com/bid/92012"
},
{
"source": "cve@mitre.org",
"url": "http://www.securitytracker.com/id/1032988"
},
{
"source": "cve@mitre.org",
"url": "http://www.ubuntu.com/usn/USN-2710-1"
},
{
"source": "cve@mitre.org",
"url": "http://www.ubuntu.com/usn/USN-2710-2"
},
{
"source": "cve@mitre.org",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"
},
{
"source": "cve@mitre.org",
"url": "https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480"
},
{
"source": "cve@mitre.org",
"url": "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992"
},
{
"source": "cve@mitre.org",
"url": "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667"
},
{
"source": "cve@mitre.org",
"url": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10136"
},
{
"source": "cve@mitre.org",
"url": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10157"
},
{
"source": "cve@mitre.org",
"url": "https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html"
},
{
"source": "cve@mitre.org",
"url": "https://security.gentoo.org/glsa/201512-04"
},
{
"source": "cve@mitre.org",
"url": "https://security.netapp.com/advisory/ntap-20151106-0001/"
},
{
"source": "cve@mitre.org",
"url": "https://support.apple.com/kb/HT205031"
},
{
"source": "cve@mitre.org",
"url": "https://www.arista.com/en/support/advisories-notices/security-advisories/1174-security-advisory-12"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42\u0026r2=1.43\u0026f=h"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://kb.juniper.net/InfoCenter/index?page=content\u0026id=JSA10697"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://openwall.com/lists/oss-security/2015/07/23/4"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://rhn.redhat.com/errata/RHSA-2016-0466.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit"
],
"url": "http://seclists.org/fulldisclosure/2015/Jul/92"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.securityfocus.com/bid/75990"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.securityfocus.com/bid/91787"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.securityfocus.com/bid/92012"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.securitytracker.com/id/1032988"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.ubuntu.com/usn/USN-2710-1"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.ubuntu.com/usn/USN-2710-2"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10136"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10157"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://security.gentoo.org/glsa/201512-04"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://security.netapp.com/advisory/ntap-20151106-0001/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://support.apple.com/kb/HT205031"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://www.arista.com/en/support/advisories-notices/security-advisories/1174-security-advisory-12"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-264"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-400"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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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.
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