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Vulnerability of FreeRADIUS: denial of service via Multithreaded BN_CTX Access

Synthesis of the vulnerability 

An attacker can trigger a fatal error via Multithreaded BN_CTX Access of FreeRADIUS, in order to trigger a denial of service.
Impacted systems: FreeRADIUS, openSUSE Leap, SLES.
Severity of this alert: 2/4.
Creation date: 15/11/2019.
Références of this alert: CVE-2019-17185, openSUSE-SU-2020:0553-1, SUSE-SU-2020:1023-1, VIGILANCE-VUL-30887.

Description of the vulnerability 

An attacker can trigger a fatal error via Multithreaded BN_CTX Access of FreeRADIUS, in order to trigger a denial of service.
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This security vulnerability impacts software or systems such as FreeRADIUS, openSUSE Leap, SLES.

Our Vigil@nce team determined that the severity of this computer weakness bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

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

Solutions for this threat 

FreeRADIUS: version 3.0.20.
The version 3.0.20 is fixed:
  https://freeradius.org/releases/

openSUSE Leap 15.1: new freeradius-server packages.
New packages are available:
  openSUSE Leap 15.1: freeradius-server 3.0.16-lp151.4.4.1

SUSE LE 15: new freeradius-server packages.
New packages are available:
  SUSE LE 15 RTM: freeradius-server 3.0.16-3.6.1
  SUSE LE 15 SP1: freeradius-server 3.0.16-3.6.1
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