FKIE_CVE-2019-3878

Vulnerability from fkie_nvd - Published: 2019-03-26 18:29 - Updated: 2026-06-17 02:35
Severity
8.1 (High) - CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
8.1 (High) - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
A vulnerability was found in mod_auth_mellon before v0.14.2. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHBA-2019:0959
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2019:0746Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2019:0766Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2019:0985
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3878Issue Tracking, Patch, Third Party Advisory
secalert@redhat.comhttps://github.com/Uninett/mod_auth_mellon/pull/196Exploit, Patch, Third Party Advisory
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CNW5YMC5TLWVWNJEY6AIWNSNPRAMWPQJ/
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X7NLAU7KROWNTHAYSA2S67X347F42L2I/
secalert@redhat.comhttps://usn.ubuntu.com/3924-1/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHBA-2019:0959
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2019:0746Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2019:0766Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2019:0985
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3878Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/Uninett/mod_auth_mellon/pull/196Exploit, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CNW5YMC5TLWVWNJEY6AIWNSNPRAMWPQJ/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X7NLAU7KROWNTHAYSA2S67X347F42L2I/
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/3924-1/Third Party Advisory
Impacted products
Vendor Product Version
mod_auth_mellon_project mod_auth_mellon *
fedoraproject fedora 29
fedoraproject fedora 30
redhat enterprise_linux 7.0
redhat enterprise_linux_desktop 7.0
redhat enterprise_linux_server 7.0
redhat enterprise_linux_server_aus 7.6
redhat enterprise_linux_server_eus 7.6
redhat enterprise_linux_server_tus 7.6
redhat enterprise_linux_workstation 7.0
canonical ubuntu_linux 18.04
canonical ubuntu_linux 18.10
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "mod_auth_mellon",
          "vendor": "uninett",
          "versions": [
            {
              "status": "affected",
              "version": "before v0.14.2"
            }
          ]
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability was found in mod_auth_mellon before v0.14.2. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication."
    },
    {
      "lang": "es",
      "value": "Se ha detectado una vulnerabilidad en mod_auth_mellon, en versiones anteriores a la v0.14.2. Si Apache est\u00e1 configurado como proxy inverso y mod_auth_mellon est\u00e1 configurado para que solo deje acceder a los usuarios autenticados (con la directiva \"require valid-user\"), la adici\u00f3n de cabeceras HTTP especiales que se suelen emplear para iniciar el SAML ECP especial (no basado en el navegador) puede emplearse para omitir la autenticaci\u00f3n."
    }
  ],
  "id": "CVE-2019-3878",
  "lastModified": "2026-06-17T02:35:47.417",
  "metrics": {
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        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.8,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "version": "2.0"
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        "exploitabilityScore": 8.6,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
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        "impactScore": 5.2,
        "source": "secalert@redhat.com",
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        "source": "nvd@nist.gov",
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  "published": "2019-03-26T18:29:00.983",
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}



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Tags
Taxonomy of the tags.





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.



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.