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Vulnerability of qmail-verify: spoofing via Mail Address Verification Bypass

Synthesis of the vulnerability 

An attacker can create spoofed data via Mail Address Verification Bypass of qmail-verify, in order to deceive the victim.
Vulnerable software: Debian, Ubuntu.
Severity of this announce: 2/4.
Creation date: 25/05/2020.
Références of this computer vulnerability: CVE-2020-3811, DLA-2234-1, DSA-4692-1, USN-4556-1, USN-4621-1, VIGILANCE-VUL-32329.

Description of the vulnerability 

An attacker can create spoofed data via Mail Address Verification Bypass of qmail-verify, in order to deceive the victim.
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This computer weakness note impacts software or systems such as Debian, Ubuntu.

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

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

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

Solutions for this threat 

Debian 8: new netqmail packages.
New packages are available:
  Debian 8: netqmail 1.06-6.2~deb8u1

Debian 9-10: new netqmail packages.
New packages are available:
  Debian 9: netqmail 1.06-6.2~deb9u1
  Debian 10: netqmail 1.06-6.2~deb10u1

Ubuntu 20.04: new netqmail packages.
New packages are available:
  Ubuntu 20.04 LTS: qmail 1.06-6.2~deb10u1build0.20.04.1

Ubuntu: new netqmail packages.
New packages are available:
  Ubuntu 18.04 LTS: qmail 1.06-6.2~deb10u1build0.18.04.1
  Ubuntu 16.04 LTS: qmail 1.06-6.2~deb10u1build0.16.04.1
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