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Vulnerability of ProFTPD: NULL pointer dereference via sk_X509_REVOKED_value tls_verify_crl

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via sk_X509_REVOKED_value() tls_verify_crl() of ProFTPD, in order to trigger a denial of service.
Vulnerable systems: Debian, Fedora, openSUSE Leap, Solaris, ProFTPD, SLES.
Severity of this threat: 2/4.
Creation date: 27/11/2019.
Références of this weakness: 861, CVE-2019-19269, DLA-2018-1, FEDORA-2019-65a983b8b6, FEDORA-2019-bfacf1e958, openSUSE-SU-2020:0031-1, VIGILANCE-VUL-31010.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via sk_X509_REVOKED_value() tls_verify_crl() of ProFTPD, in order to trigger a denial of service.
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This computer vulnerability announce impacts software or systems such as Debian, Fedora, openSUSE Leap, Solaris, ProFTPD, SLES.

Our Vigil@nce team determined that the severity of this cybersecurity bulletin 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 threat alert.

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 sk_X509_REVOKED_value tls_verify_crl.
A patch is indicated in information sources.

Debian 8: new proftpd-dfsg packages.
New packages are available:
  Debian 8: proftpd-dfsg 1.3.5e+r1.3.5-2+deb8u5

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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