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systemd: Spoofing of XDG_SEAT allows for actions to be checked against "allow_active" instead of "allow_any"

🗓️ 19 Oct 2021 07:18:34Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 10 Views

pam_systemd fails to sanitize the desktop seat variable, enabling spoofing to trigger allow_active instead of allow_any.

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Refs
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IBM Security Bulletins		Security Bulletin: Cloud Pak for Security uses packages that are vulnerable to several CVEs
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Tenable Nessus		Amazon Linux 2 : systemd (ALAS-2022-1854)
10 Oct 202200:00
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Tenable Nessus		Alibaba Cloud Linux 3 : 0039: systemd (ALINUX3-SA-2022:0039)
14 May 202500:00
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Tenable Nessus		AlmaLinux 8 : systemd (ALSA-2021:1611)
9 Feb 202200:00
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Tenable Nessus		CentOS 8 : systemd (CESA-2021:1611)
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Tenable Nessus		Debian DSA-4428-1 : systemd - security update
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Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.2aarch64systemd239-31.el8_2.7systemd-239-31.el8_2.7.aarch64.rpm
Red Hat Enterprise Linux8.2i686systemd239-31.el8_2.7systemd-239-31.el8_2.7.i686.rpm
Red Hat Enterprise Linux8.2ppc64lesystemd239-31.el8_2.7systemd-239-31.el8_2.7.ppc64le.rpm
Red Hat Enterprise Linux8.2s390xsystemd239-31.el8_2.7systemd-239-31.el8_2.7.s390x.rpm
Red Hat Enterprise Linux8.2x86_64systemd239-31.el8_2.7systemd-239-31.el8_2.7.x86_64.rpm
Red Hat Enterprise Linux8.2aarch64systemd-container239-31.el8_2.7systemd-container-239-31.el8_2.7.aarch64.rpm
Red Hat Enterprise Linux8.2i686systemd-container239-31.el8_2.7systemd-container-239-31.el8_2.7.i686.rpm
Red Hat Enterprise Linux8.2ppc64lesystemd-container239-31.el8_2.7systemd-container-239-31.el8_2.7.ppc64le.rpm
Red Hat Enterprise Linux8.2s390xsystemd-container239-31.el8_2.7systemd-container-239-31.el8_2.7.s390x.rpm
Red Hat Enterprise Linux8.2x86_64systemd-container239-31.el8_2.7systemd-container-239-31.el8_2.7.x86_64.rpm
Rows per page

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21 Nov 2025 18:25Current
7.2High risk
Vulners AI Score7.2
CVSS 24.4
CVSS 3.17
CVSS 34.5
EPSS0.01217
SSVC
CWE-863
systemddesktop seat spoofingpam systemdenvironment sanitizationpolkit policiesallow activeallow any
10