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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.94%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.94% probability · 59th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-266, CWE-269
- Affected
- systemd project/systemd · fedoraproject/fedora · canonical/ubuntu linux · netapp/hci management node · netapp/snapprotect · netapp/solidfire · netapp/cn1610 firmware
- Source
- secalert@redhat.com
References
- http://www.securityfocus.com/bid/108116Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3843Issue Tracking, Patch, Third Party Advisory
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5JXQAKSTMABZ46EVCRMW62DHWYHTTFES/
- https://security.netapp.com/advisory/ntap-20190619-0002/Third Party Advisory
- https://usn.ubuntu.com/4269-1/Third Party Advisory
- http://www.securityfocus.com/bid/108116Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3843Issue Tracking, Patch, Third Party Advisory
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5JXQAKSTMABZ46EVCRMW62DHWYHTTFES/
- https://security.netapp.com/advisory/ntap-20190619-0002/Third Party Advisory
- https://usn.ubuntu.com/4269-1/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.