FKIE_CVE-2019-3842

Vulnerability from fkie_nvd - Published: 2019-04-09 21:29 - Updated: 2026-06-17 02:35
Severity
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In systemd before v242-rc4, it was discovered that pam_systemd does not properly sanitize the environment before using the XDG_SEAT variable. It is possible for an attacker, in some particular configurations, to set a XDG_SEAT environment variable which allows for commands to be checked against polkit policies using the "allow_active" element rather than "allow_any".
References
secalert@redhat.comhttp://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.htmlThird Party Advisory
secalert@redhat.comhttp://packetstormsecurity.com/files/152610/systemd-Seat-Verification-Active-Session-Spoofing.htmlExploit, Third Party Advisory, VDB Entry
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3842Issue Tracking, Third Party Advisory
secalert@redhat.comhttps://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
secalert@redhat.comhttps://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
secalert@redhat.comhttps://lists.debian.org/debian-lts-announce/2019/04/msg00022.htmlThird Party Advisory
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STR36RJE4ZZIORMDXRERVBHMPRNRTHAC/
secalert@redhat.comhttps://www.exploit-db.com/exploits/46743/Exploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/152610/systemd-Seat-Verification-Active-Session-Spoofing.htmlExploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3842Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2019/04/msg00022.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STR36RJE4ZZIORMDXRERVBHMPRNRTHAC/
af854a3a-2127-422b-91ae-364da2661108https://www.exploit-db.com/exploits/46743/Exploit, Third Party Advisory, VDB Entry
Impacted products
Vendor Product Version
systemd_project systemd *
systemd_project systemd 242
systemd_project systemd 242
systemd_project systemd 242
redhat enterprise_linux 7.0
fedoraproject fedora 30
debian debian_linux 8.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "systemd",
          "vendor": "The systemd Project",
          "versions": [
            {
              "status": "affected",
              "version": "v242-rc4"
            }
          ]
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:systemd_project:systemd:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "02E0A07B-34D3-403B-A503-CB11C9203FE9",
              "versionEndIncluding": "241",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:systemd_project:systemd:242:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "3E2ACFB1-6787-47D0-B7F3-CF4F129732A2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:systemd_project:systemd:242:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "22EB9C1F-9101-4AD5-80FD-CB5EA224A13F",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:systemd_project:systemd:242:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "9A203307-2242-475A-8ADF-3A1D112655D5",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
              "matchCriteriaId": "97A4B8DF-58DA-4AB6-A1F9-331B36409BA3",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "C11E6FB0-C8C0-4527-9AA0-CB9B316F8F43",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In systemd before v242-rc4, it was discovered that pam_systemd does not properly sanitize the environment before using the XDG_SEAT variable. It is possible for an attacker, in some particular configurations, to set a XDG_SEAT environment variable which allows for commands to be checked against polkit policies using the \"allow_active\" element rather than \"allow_any\"."
    },
    {
      "lang": "es",
      "value": "En systemd anterior de la versi\u00f3n v242-rc4, fue encontrado que pam_systemd no sanea apropiadamente el entorno anterior usando la variable XDG_SEAT. Es posible que un atacante, en ciertas configuraciones particulares, establezca una variable de entorno XDG_SEAT que permita comprobar los comandos contra las pol\u00edticas polkit utilizando el elemento \"allow_active\" en lugar de \"allow_any\"."
    }
  ],
  "id": "CVE-2019-3842",
  "lastModified": "2026-06-17T02:35:42.357",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.4,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 3.4,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 4.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.0"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.4,
        "source": "secalert@redhat.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2019-3842",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-06-09T15:47:18.222753Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2019-04-09T21:29:03.443",
  "references": [
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://packetstormsecurity.com/files/152610/systemd-Seat-Verification-Active-Session-Spoofing.html"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Issue Tracking",
        "Third Party Advisory"
      ],
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3842"
    },
    {
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    },
    {
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    },
    {
      "source": "secalert@redhat.com",
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      "url": "https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STR36RJE4ZZIORMDXRERVBHMPRNRTHAC/"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
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    },
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    },
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  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
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          "value": "CWE-285"
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          "value": "CWE-863"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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