Auth bypass in Systemd Project
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".
EPSS: 0.012 (66.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Systemd_project Systemd — versions 242
- The Systemd Project — versions v242-rc4
- Debian Debian_linux — versions 8.0
- Fedoraproject Fedora — versions 30
- Redhat Enterprise_linux — versions 7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory, Issue Tracking)
- secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
- secalert@redhat.com (Exploit, VDB Entry, Third Party Advisory, exploit, x_refsource_EXPLOIT-DB)
- secalert@redhat.com (Exploit, VDB Entry, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_SUSE)
- secalert@redhat.com (mailing-list, x_refsource_MLIST)
- secalert@redhat.com (mailing-list, x_refsource_MLIST)
Frequently asked questions
- What is CVE-2019-3842?
- CVE-2019-3842 is a high-severity vulnerability in Systemd Project, classified under Improper Authorization. CVSS score: 7.0/10. Published 2019-04-09.
- How severe is CVE-2019-3842?
- High severity. CVSS v3 base score is 7.0 out of 10.
- Is CVE-2019-3842 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.