CVE-2019-3842

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".

CVSS v3.0 7.0 HIGH
CVSS v2.0 4.4 MEDIUM

7.0^/10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 1.0 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

4.4^/10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:L/AC:M/Au:N/C:P/I:P/A:P

Exploitability : 3.4 / Impact : 6.4

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3842	Issue Tracking Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/STR36RJE4ZZIORMDXRERVBHMPRNRTHAC/	Mailing List Release Notes Third Party Advisory
https://www.exploit-db.com/exploits/46743/	Exploit Third Party Advisory VDB Entry
http://packetstormsecurity.com/files/152610/systemd-Seat-Verification-Active-Session-Spoofing.html	Exploit Third Party Advisory VDB Entry
https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html	Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html	Third Party Advisory
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4@%3Cissues.bookkeeper.apache.org%3E	Third Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b@%3Cissues.bookkeeper.apache.org%3E	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:systemd_project:systemd:242:rc1::::::
	cpe:2.3:a:systemd_project:systemd:242:rc2::::::
	cpe:2.3:a:systemd_project:systemd:242:rc3::::::
	cpe:2.3:a:systemd_project:systemd::::::::

Configuration 2 (hide)

cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*

Configuration 3 (hide)

cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*

Configuration 4 (hide)

cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

Information

Published : 2019-04-09 14:29

Updated : 2022-01-31 10:51

NVD link : CVE-2019-3842

Mitre link : CVE-2019-3842

JSON object : View

CWE

CWE-863

Incorrect Authorization

Products Affected

fedoraproject

fedora

debian

debian_linux

systemd_project

systemd

redhat

enterprise_linux

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7.0 /10