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Vulnerability of ProFTPD: NULL pointer dereference via Client Certificate tls_verify_crl

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via Client Certificate tls_verify_crl() of ProFTPD, in order to trigger a denial of service.
Impacted systems: ProFTPD.
Severity of this alert: 2/4.
Creation date: 27/11/2019.
Références of this alert: 858, CVE-2019-19272, VIGILANCE-VUL-31007.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via Client Certificate tls_verify_crl() of ProFTPD, in order to trigger a denial of service.
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This computer vulnerability note impacts software or systems such as ProFTPD.

Our Vigil@nce team determined that the severity of this computer vulnerability announce is medium.

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

An attacker with a expert ability can exploit this cybersecurity announce.

Solutions for this threat 

ProFTPD: version 1.3.6.
The version 1.3.6 is fixed:
  https://github.com/proftpd/proftpd/

ProFTPD: patch for Client Certificate tls_verify_crl.
A patch is indicated in information sources.
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