Privilege escalation in [Freedesktop.org] Systemd
CVE-2019-3843
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (61.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- [Freedesktop.org] Systemd — versions 242
- NetApp Cn1610
- NetApp Cn1610 Firmware
- NetApp Hci Management Node
- NetApp Snapprotect
- NetApp Solidfire
- Systemd Project
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.10
- Fedoraproject Fedora — versions 30
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.securityfocus.com/bid/108116 (VDB Entry, Third Party Advisory, vdb-entry)
- security.netapp.com/advisory/ntap-20190619-0002/ (Third Party Advisory)
- usn.ubuntu.com/4269-1/ (vendor-advisory, Third Party Advisory)
- lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a4508… (mailing-list)
- lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698… (mailing-list)
Frequently asked questions
- What is CVE-2019-3843?
- CVE-2019-3843 is a high-severity vulnerability in [Freedesktop.org] Systemd, classified under Incorrect Privilege Assignment. CVSS score: 7.8/10. Published 2019-04-26.
- How severe is CVE-2019-3843?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2019-3843 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.