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Fencer Vulns
medium 4.5

CVE-2019-3843 json

It was discovered that a systemd service that uses DynamicUser property can create a SUID/SGID binary that would be allowed to run as the t…

published 2019-04-26 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-13463

cvss
4.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 61%
public exploits
1
Exploit-DB

Summary

It was discovered that a systemd service that uses DynamicUser property can create a SUID/SGID binary that would be allowed to run as the transient service UID/GID even after the service is terminated. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the UID/GID will be recycled.

Patch / fix

  • systemd_project systemd 242
  • systemd Debian 14, Debian 13, Debian 12 242-4

debian advisories DEBIAN-CVE-2019-3843

  • systemd Ubuntu 18.04 LTS 237-3ubuntu10.38

ubuntu advisories UBUNTU-CVE-2019-3843

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • systemd RHEL 8 239-29.el8
  • systemd-pam RHEL 8 239-29.el8
  • systemd-libs RHEL 8 239-29.el8
  • systemd-udev RHEL 8 239-29.el8
  • systemd-tests RHEL 8 239-29.el8
  • systemd-container RHEL 8 239-29.el8
  • systemd-journal-remote RHEL 8 239-29.el8

red hat advisories RHSA-2020:1794

  • systemd SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 234-24.30.1

suse advisories SUSE-SU-2019:1364-2SUSE-SU-2019:1364-1

  • systemd openSUSE Tumbleweed 249.4-2.2

opensuse advisories openSUSE-SU-2024:11420-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-3843 updated cvss 4.5

systemd: services with DynamicUser can create SUID/SGID binaries

  • Red Hat Enterprise Linux BaseOS (v. 8) systemd 239-29.el8, systemd-pam 239-29.el8, systemd-libs 239-29.el8, systemd-udev 239-29.el8, systemd-tests 239-29.el8, systemd-container 239-29.el8, +1 more
    fixed: vendor fix RHSA-2020:1794
  • Red Hat Enterprise Linux 7 systemd, libgudev1, systemd-libs, systemd-sysv, systemd-python, systemd-networkd, +2 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-46760)
  2. Published

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
17 mo ago

Exploit prediction

0.94% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-46760 systemd - DynamicUser can Create setuid Binaries when Assisted by Another Process dos, 2019-04-26

CVSS scores

assigned by version score vector
CNA 3.0 4.5 CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • [freedesktop.org] systemd

Classification

Weakness
  • CWE-266 Incorrect Privilege Assignment
  • CWE-269 Improper Privilege Management

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.