Privilege escalation in systemd

Published: 2019-05-13 | Updated: 2019-05-13
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-3843
CWE ID CWE-264
Exploitation vector Local
Public exploit N/A
Vulnerable software systemd Subscribe
Vendor Freedesktop.org

Security Advisory

This security advisory describes one low risk vulnerability.

1) Permissions, Privileges, and Access Controls

Severity: Low

CVSSv3: 6.8 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-3843

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to an error in the process of binary creation, when the DynamicUser property is used to create a SUID or SGID binary for a systemd service. A local user can abuse the systemd functionality to execute arbitrary code on the target system with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

systemd: 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 241-rc1, 241-rc2, 242-rc1, 242-rc2, 242-rc3, 242-rc4

CPE External links

http://www.securityfocus.com/bid/108116
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3843
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5JXQAKSTMABZ46EVCRMW62DHWYHTTFES/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.