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Vulnerability of LINBIT csync2: Man-in-the-Middle via gnutls_handshake

Synthesis of the vulnerability 

An attacker can act as a Man-in-the-Middle via gnutls_handshake() on LINBIT csync2, in order to read or write data in the session.
Vulnerable products: Debian, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this weakness: 2/4.
Creation date: 05/01/2021.
Références of this bulletin: CVE-2019-15523, DLA-2515-1, openSUSE-SU-2021:0853-1, SUSE-SU-2021:1858-1, SUSE-SU-2021:1952-1, VIGILANCE-VUL-34236.

Description of the vulnerability 

An attacker can act as a Man-in-the-Middle via gnutls_handshake() on LINBIT csync2, in order to read or write data in the session.
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This vulnerability bulletin impacts software or systems such as Debian, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this security note 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 cybersecurity note.

Solutions for this threat 

Debian 9: new csync2 packages.
New packages are available:
  Debian 9: csync2 2.0-8-g175a01c-4+deb9u2

openSUSE Leap 15.2: new csync2 packages.
New packages are available:
  openSUSE Leap 15.2: csync2 2.0+git.1461714863.10636a4-lp152.5.3.1

SUSE LE 12 SP3-5: new csync2 packages.
New packages are available:
  SUSE LE 12 SP3: csync2 2.0+git.1368794815.cf835a7-3.9.5
  SUSE LE 12 SP4: csync2 2.0+git.1368794815.cf835a7-3.9.5
  SUSE LE 12 SP5: csync2 2.0+git.1368794815.cf835a7-3.9.5

SUSE LE 15 RTM-SP2: new csync2 packages.
New packages are available:
  SUSE LE 15 RTM: csync2 2.0+git.1461714863.10636a4-4.6.1
  SUSE LE 15 SP1: csync2 2.0+git.1461714863.10636a4-4.6.1
  SUSE LE 15 SP2: csync2 2.0+git.1461714863.10636a4-4.6.1
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