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Vulnerability of systemd: privilege escalation via Numerical Usernames

Synthesis of the vulnerability 

An attacker can bypass restrictions via Numerical Usernames of systemd, in order to escalate his privileges.
Vulnerable software: RHEL.
Severity of this announce: 2/4.
Creation date: 19/05/2021.
Références of this computer vulnerability: CVE-2020-13776, RHSA-2021:1611-01, VIGILANCE-VUL-35473.

Description of the vulnerability 

An attacker can bypass restrictions via Numerical Usernames of systemd, in order...
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This threat note impacts software or systems such as RHEL.

Our Vigil@nce team determined that the severity of this cybersecurity note is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this vulnerability note.

Solutions for this threat 

Workarounds for this vulnerability are not yet public.
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