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Vulnerability of Exim: privilege escalation via SPA authentication

Synthesis of the vulnerability 

An attacker can bypass restrictions via SPA authentication of Exim, in order to escalate his privileges.
Vulnerable systems: Debian, Exim, openSUSE Leap, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 12/05/2020.
Références of this weakness: 2571, CVE-2020-12783, DLA-2213-1, DSA-4687-1, openSUSE-SU-2021:0677-1, openSUSE-SU-2021:0753-1, openSUSE-SU-2021:0754-1, USN-4366-1, VIGILANCE-VUL-32234.

Description of the vulnerability 

An attacker can bypass restrictions via SPA authentication of Exim, in order to escalate his privileges.
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This security announce impacts software or systems such as Debian, Exim, openSUSE Leap, SLES, Ubuntu.

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

Solutions for this threat 

Exim: patch for SPA.
A patch is indicated in information sources.

Debian 8-10: new exim4 packages.
New packages are available:
  Debian 8: exim4 4.84.2-2+deb8u7
  Debian 9: exim4 4.89-2+deb9u7
  Debian 10: exim4 4.92-8+deb10u4

openSUSE Leap 15.2: new exim packages.
New packages are available:
  openSUSE Leap 15.2: exim 4.94.2-lp152.8.3.1

SUSE LE 15 SP1: new exim packages.
New packages are available:
  SUSE LE 15 SP1: exim 4.94.2-bp151.2.4.1

SUSE LE 15 SP2: new exim packages.
New packages are available:
  SUSE LE 15 SP2: exim 4.94.2-bp152.6.4.1

Ubuntu: new exim4 packages.
New packages are available:
  Ubuntu 20.04 LTS: exim4-base 4.93-13ubuntu1.1, exim4-daemon-heavy 4.93-13ubuntu1.1, exim4-daemon-light 4.93-13ubuntu1.1
  Ubuntu 19.10: exim4-base 4.92.1-1ubuntu3.1, exim4-daemon-heavy 4.92.1-1ubuntu3.1, exim4-daemon-light 4.92.1-1ubuntu3.1
  Ubuntu 18.04 LTS: exim4-base 4.90.1-1ubuntu1.5, exim4-daemon-heavy 4.90.1-1ubuntu1.5, exim4-daemon-light 4.90.1-1ubuntu1.5
  Ubuntu 16.04 LTS: exim4-base 4.86.2-2ubuntu2.6, exim4-daemon-heavy 4.86.2-2ubuntu2.6, exim4-daemon-light 4.86.2-2ubuntu2.6
  Ubuntu 14.04 ESM: exim4-base 4.82-3ubuntu2.4+esm2, exim4-daemon-heavy 4.82-3ubuntu2.4+esm2, exim4-daemon-light 4.82-3ubuntu2.4+esm2
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