Vulnerability identifier: #VU24717

Vulnerability risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3844

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
systemd
Server applications / Other server solutions

Vendor: Freedesktop.org

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to the systemd service that uses DynamicUser property can get new privileges through the execution of SUID binaries, which would allow to create binaries owned by the service transient group with the setgid bit set. A local user may use this flaw to access resources that will be owned by a potentially different service in the future, when the GID will be recycled.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

systemd: 230 - 242 rc4

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External links
http://www.securityfocus.com/bid/108096
http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3844

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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.