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{"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", "upstream_fix": "systemd 242"}