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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".

CVE-2019-3842 is a medium-severity vulnerability affecting systemd versions prior to v242-rc4. The issue lies in the pam_systemd module, which is responsible for integrating systemd with PAM (Pluggable Authentication Modules). Specifically, pam_systemd does not properly sanitize the environment variable XDG_SEAT before using it. This improper sanitization allows an attacker, under certain configurations, to manipulate the XDG_SEAT environment variable to influence how commands are checked against polkit policies. Normally, polkit uses the "allow_any" element for policy checks, but due to this vulnerability, an attacker can cause the system to use the less restrictive "allow_active" element instead. This change potentially lowers the authorization requirements for executing certain commands, enabling privilege escalation or unauthorized actions. The vulnerability is classified under CWE-285 (Improper Authorization), indicating that the system does not correctly enforce access control policies. The CVSS 3.0 base score is 4.5 (medium), reflecting that the attack vector is local (AV:L), requires high attack complexity (AC:H), low privileges (PR:L), no user interaction (UI:N), and impacts confidentiality, integrity, and availability to a limited extent (C:L/I:L/A:L). No known exploits have been reported in the wild, and no official patches are linked in the provided data, but the issue was addressed in systemd v242-rc4 and later versions.

Detailed information about CVE-2019-3842: CWE-285 in The systemd Project systemd affecting The systemd Project systemd. Get real-time updates, technical details

CVE-2019-3842: CWE-285 in The systemd Project systemd - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2019-3842: CWE-285 in The systemd Project systemd

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