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Vulnerability of Samba: privilege escalation via DelegationNotAllowed S4U2Self

Synthesis of the vulnerability 

An attacker can bypass restrictions via DelegationNotAllowed S4U2Self of Samba, in order to escalate his privileges.
Vulnerable systems: Fedora, openSUSE Leap, Samba, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Ubuntu.
Severity of this threat: 2/4.
Creation date: 10/12/2019.
Références of this weakness: CERTFR-2019-AVI-614, CVE-2019-14870, FEDORA-2019-11dddb785b, FEDORA-2019-be98a08835, openSUSE-SU-2019:2700-1, SUSE-SU-2019:3319-1, SUSE-SU-2020:2673-1, Synology-SA-19:40, USN-4217-1, USN-4217-2, VIGILANCE-VUL-31100.

Description of the vulnerability 

An attacker can bypass restrictions via DelegationNotAllowed S4U2Self of Samba, in order to escalate his privileges.
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This security bulletin impacts software or systems such as Fedora, openSUSE Leap, Samba, SUSE Linux Enterprise Desktop, SLES, Synology DSM, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity announce 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 vulnerability alert.

Solutions for this threat 

Samba: version 4.11.3.
The version 4.11.3 is fixed:
  https://www.samba.org/samba/download/

Samba: version 4.10.11.
The version 4.10.11 is fixed:
  https://www.samba.org/samba/download/

Samba: version 4.9.17.
The version 4.9.17 is fixed:
  https://www.samba.org/samba/download/

Fedora: new samba packages.
New packages are available:
  Fedora 30: samba 4.10.11-0.fc30
  Fedora 31: samba 4.11.3-0.fc31

openSUSE Leap 15.1: new samba packages.
New packages are available:
  openSUSE Leap 15.1: samba 4.9.5+git.224.86a8e66adea-lp151.2.12.1

SUSE LE 12 SP5: new samba packages (18/09/2020).
New packages are available:
  SUSE LE 12 SP5: samba 4.10.17+git.203.862547088ca-3.14.1

SUSE LE 15 SP1: new samba packages.
New packages are available:
  SUSE LE 15 SP1: samba 4.9.5+git.224.86a8e66adea-3.18.1

Synology DSM: version 6.2.3-25423.
The version 6.2.3-25423 is fixed:
  https://www.synology.com/

Ubuntu: new samba packages.
New packages are available:
  Ubuntu 19.10: samba 2:4.10.7+dfsg-0ubuntu2.3
  Ubuntu 19.04: samba 2:4.10.0+dfsg-0ubuntu2.7
  Ubuntu 18.04 LTS: samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.14
  Ubuntu 16.04 LTS: samba 2:4.3.11+dfsg-0ubuntu0.16.04.24
  Ubuntu 14.04 ESM: samba 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4

Wind River Linux: version 10.17.41.21.
The version 10.17.41.21 is fixed:
  https://support2.windriver.com/

Wind River Linux: version 10.19.45.3.
The version 10.19.45.3 is fixed:
  https://support2.windriver.com/
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