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Vulnerability of ProFTPD: privilege escalation via CRL Entry Revoked Certificates tls_verify_crl

Synthesis of the vulnerability 

An attacker can bypass restrictions via CRL Entry Revoked Certificates tls_verify_crl() of ProFTPD, in order to escalate his privileges.
Vulnerable products: Fedora, openSUSE Leap, Solaris, ProFTPD, SLES.
Severity of this weakness: 2/4.
Creation date: 27/11/2019.
Références of this bulletin: 859, CVE-2019-19270, FEDORA-2019-65a983b8b6, FEDORA-2019-bfacf1e958, openSUSE-SU-2020:0031-1, VIGILANCE-VUL-31008.

Description of the vulnerability 

An attacker can bypass restrictions via CRL Entry Revoked Certificates tls_verify_crl() of ProFTPD, in order to escalate his privileges.
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This computer threat impacts software or systems such as Fedora, openSUSE Leap, Solaris, ProFTPD, SLES.

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

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

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

Solutions for this threat 

ProFTPD: version 1.3.6c.
The version 1.3.6c is fixed:
  https://github.com/proftpd/proftpd/archive/v1.3.6c.tar.gz

ProFTPD: patch for CRL Entry Revoked Certificates tls_verify_crl.
A patch is indicated in information sources.

Fedora: new proftpd packages.
New packages are available:
  Fedora 30: proftpd 1.3.6b-2.fc30
  Fedora 31: proftpd 1.3.6b-2.fc31

openSUSE Leap 15.1: new proftpd packages.
New packages are available:
  openSUSE Leap 15.1: proftpd 1.3.6b-lp151.3.6.1
  SUSE LE 15 RTM: proftpd 1.3.6b-bp150.3.6.1
  SUSE LE 15 SP1: proftpd 1.3.6b-bp151.4.6.2

Oracle Solaris: patch for third party software of Januray 2020 v3.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1
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