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CVE-2019-3842

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Date: April 9, 2019

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".

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Severity Score

Related Resources (13)

http://packetstormsecurity.com/files/152610/systemd-Seat-Verification-Active-Session-Spoofing.html
https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4@%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b@%3Cissues.bookkeeper.apache.org%3E
https://access.redhat.com/security/cve/CVE-2019-3842
https://nvd.nist.gov/vuln/detail/CVE-2019-3842
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3842
https://security-tracker.debian.org/tracker/CVE-2019-3842
https://people.canonical.com/~ubuntu-security/cve/CVE-2019-3842
https://www.exploit-db.com/exploits/46743/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/STR36RJE4ZZIORMDXRERVBHMPRNRTHAC/
https://www.mend.io/vulnerability-database/CVE-2019-3842

Severity Score

Weakness Type (CWE)

Improper Authorization

CWE-285

Permissions, Privileges, and Access Control

CWE-264

Incorrect Authorization

CWE-863

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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