CVE-2019-3842

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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": 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"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"}, {"source": "secalert@redhat.com", "url": "https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E"}, {"source": "secalert@redhat.com", "url": "https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "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": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "https://www.exploit-db.com/exploits/46743/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "http://packetstormsecurity.com/files/152610/systemd-Seat-Verification-Active-Session-Spoofing.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3842"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STR36RJE4ZZIORMDXRERVBHMPRNRTHAC/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "url": "https://www.exploit-db.com/exploits/46743/"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-285"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-863"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank Jann Horn (Google Project Zero) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2021:1611", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "systemd-0:239-45.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-05-18T00:00:00Z"}, {"advisory": "RHSA-2021:3900", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "systemd-0:239-31.el8_2.7", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-10-19T00:00:00Z"}], "bugzilla": {"description": "systemd: Spoofing of XDG_SEAT allows for actions to be checked against \"allow_active\" instead of \"allow_any\"", "id": "1668521", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1668521"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.5", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L", "status": "verified"}, "cwe": "CWE-863", "details": ["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\".", "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\"."], "name": "CVE-2019-3842", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2019-04-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-3842\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-3842"], "statement": "For the attack to be successful, a new session must be created by pam_systemd. This is done only if the calling process is not already part of a session. Red Hat Enterprise Linux, in its default PAM configurations, does not let a session sneak in without systemd knowing about it, since pam_systemd is always called in every PAM config file. Unless a wrong PAM config file is in place, this vulnerability cannot be triggered on Red Hat Enterprise Linux 7 and 8.", "threat_severity": "Moderate"}

{}