SB2019051303 - Privilege escalation in systemd 

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Main Vulnerability Database SB2019051303

SB2019051303 - Privilege escalation in systemd

Published: May 13, 2019

Security Bulletin ID SB2019051303
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 secuirty vulnerabilities.


1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-3843)

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.


2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-3844)

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.


Remediation

Install update from vendor's website.

References