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".
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
|Base Score:||Base Metrics:|
|Access Vector:||Undefined||Attack Complexity:||Undefined|
|Privileges Required:||None||User Interaction:||None|
|Integrity Impact:||Undefined||Availability Impact:||Undefined|
|Oracle Linux version 8 (systemd)||ELSA-2021-1611||2021-05-25|
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