Incorrect default permissions in systemd - CVE-2019-15718

Vulnerability identifier: #VU20837

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-15718

CWE-ID: CWE-276

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to change DNS settings.

The vulnerability exists due to the systemd-resolved D-Bus interface does not enforce appropriate access controls. A local unprivileged user can modify DNS resolver settings.

systemd
systemd (Ubuntu package)
Arch Linux
Red Hat Enterprise Linux for x86_64
Fedora
Red Hat OpenShift Container Platform

Install updates from vendor's website.

systemd - update to 243
Red Hat OpenShift Container Platform - update to 4.1.24
systemd (Ubuntu package) - addressed in versions 237-3ubuntu10.28, 240-6ubuntu5.6
systemd - addressed in versions 239-14.git33ccd62.fc29, 241-12.git1e19bcd.fc30, 243-1.fc31

• https://github.com/systemd/systemd/pull/13457/commits/35e528018f315798d3bffcb592b32a0d8f5162bd
• https://github.com/systemd/systemd/pull/13457
• https://www.openwall.com/lists/oss-security/2019/09/03/1

• Multiple vulnerabilities in systemd
• Ubuntu update for systemd
• Arch Linux update for systemd
• Red Hat update for systemd
• Multiple vulnerabilities in Red Hat OpenShift Container Platform (machine-os-content-container)
• Fedora 29 update for systemd
• Fedora 30 update for systemd
• Fedora 31 update for systemd