SB2020020632 - Fedora 30 update for systemd

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Main Vulnerability Database SB2020020632

SB2020020632 - Fedora 30 update for systemd

Published: February 6, 2020 Updated: April 25, 2025

Security Bulletin ID SB2020020632
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Memory leak (CVE-ID: CVE-2019-20386)

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

CVSSv4: 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


The vulnerability allows a local user to perform DoS attack on the target system.

The vulnerability exists due memory leak in button_open() function in login/logind-button.c in systemd. A remote attacker can execute the udevadm trigger command and perform denial of service attack.


2) Use-after-free (CVE-ID: CVE-2020-1712)

CWE-ID: CWE-416 - Use After Free

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


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

The vulnerability exists due to a use-after-free error when processing dbus messages during asynchronous Polkit queries in bus-polkit.c in systemd. A local unprivileged user can send a specially crafted dbus message, trigger a use-after-free error and crash services or execute arbitrary code on the system with elevated privileges.


Remediation

Install update from vendor's website.

References