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Vulnerability of OpenSSL: NULL pointer dereference via SSL_check_chain

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via SSL_check_chain() of OpenSSL, in order to trigger a denial of service.
Vulnerable products: Debian, FreeBSD, hMailServer, Nodejs Core, OpenSSL, Puppet, Python, SUSE Linux Enterprise Desktop, SLES, Nessus, WinSCP.
Severity of this weakness: 3/4.
Creation date: 21/04/2020.
Revision date: 05/05/2020.
Références of this bulletin: CERTFR-2020-AVI-235, CVE-2020-1967, DSA-4661-1, FreeBSD-SA-20:11.openssl, SUSE-SU-2020:1058-1, VIGILANCE-VUL-32076.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via SSL_check_chain() of...
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This vulnerability alert impacts software or systems such as Debian, FreeBSD, hMailServer, Nodejs Core, OpenSSL, Puppet, Python, SUSE Linux Enterprise Desktop, SLES, Nessus, WinSCP.

Our Vigil@nce team determined that the severity of this computer weakness alert is important.

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

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a specialist ability can exploit this computer vulnerability.

Solutions for this threat 

Solutions, fixes, patches and workarounds for this vulnerability are not yet public.
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