CVE-2015-5600 (GCVE-0-2015-5600)

Vulnerability from cvelistv5 – Published: 2015-08-03 00:00 – Updated: 2026-05-27 16:31
VLAI
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.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-27 16:31 UTC
CWE
  • n/a
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
mitre CNA under the mitre root
CNA scorecard E 28/100 over 2291 records in the last 180 days details
References
URL Tags
http://www.oracle.com/technetwork/topics/security…
http://www.ubuntu.com/usn/USN-2710-2 vendor-advisory
http://lists.fedoraproject.org/pipermail/package-… vendor-advisory
http://www.oracle.com/technetwork/security-adviso…
https://h20566.www2.hpe.com/portal/site/hpsc/publ…
https://h20566.www2.hpe.com/portal/site/hpsc/publ…
http://www.oracle.com/technetwork/topics/security…
http://www.oracle.com/technetwork/security-adviso…
https://security.gentoo.org/glsa/201512-04 vendor-advisory
https://kc.mcafee.com/corporate/index?page=conten…
https://security.netapp.com/advisory/ntap-2015110…
http://rhn.redhat.com/errata/RHSA-2016-0466.html vendor-advisory
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.…
http://www.oracle.com/technetwork/topics/security…
http://kb.juniper.net/InfoCenter/index?page=conte…
http://lists.apple.com/archives/security-announce… vendor-advisory
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.…
https://kc.mcafee.com/corporate/index?page=conten…
http://www.securityfocus.com/bid/75990 vdb-entry
http://www.securityfocus.com/bid/91787 vdb-entry
https://h20564.www2.hpe.com/portal/site/hpsc/publ…
http://lists.opensuse.org/opensuse-security-annou… vendor-advisory
http://www.securityfocus.com/bid/92012 vdb-entry
https://support.apple.com/kb/HT205031
https://lists.debian.org/debian-lts-announce/2018… mailing-list
http://openwall.com/lists/oss-security/2015/07/23/4 mailing-list
http://www.ubuntu.com/usn/USN-2710-1 vendor-advisory
http://lists.fedoraproject.org/pipermail/package-… vendor-advisory
http://www.securitytracker.com/id/1032988 vdb-entry
http://seclists.org/fulldisclosure/2015/Jul/92 mailing-list
http://www.oracle.com/technetwork/topics/security…
https://www.arista.com/en/support/advisories-noti…
https://cert-portal.siemens.com/productcert/pdf/s…
Date Public
2015-07-17 00:00
Show details on NVD website

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      "vulnStatus": "Modified",
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              "value": "CWE-264"
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            "nodes": [
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                "cpeMatch": [
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                    "matchCriteriaId": "27C9A807-7740-4D75-9B01-91ED53D14C40",
                    "versionEndIncluding": "6.9",
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                "negate": false,
                "operator": "OR"
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        "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."
          }
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        "id": "CVE-2015-5600",
        "lastModified": "2026-05-27T18:16:20.367",
        "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
            }
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          "cvssMetricV31": [
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              "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"
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              "exploitabilityScore": 2.2,
              "impactScore": 5.9,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
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        "published": "2015-08-03T01:59:03.950",
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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.
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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Events included in the timeline

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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.