Multiple vulnerabilities in systemd

Published: 2019-09-04 | Updated: 2020-01-29

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-15718 CVE-2019-20386
CWE-ID	CWE-276 CWE-401
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	systemd Server applications / Other server solutions
Vendor	Freedesktop.org

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

Updated: 29.01.2020

Added vulnerability #2.

1) Incorrect default permissions

EUVDB-ID: #VU20837

Risk: Low

CVSSv4.0: 1.1 [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/E:U/U:Clear]

CVE-ID: CVE-2019-15718

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

systemd: 237 - 242

CPE2.3

External links

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

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.

2) Memory leak

EUVDB-ID: #VU24716

Risk: Low

CVSSv4.0: 5.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Clear]

CVE-ID: CVE-2019-20386

CWE-ID: CWE-401 - Missing release of memory after effective lifetime