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Vulnerability of OpenSMTPD: file reading via Makemap Hardlink

Synthesis of the vulnerability 

A local attacker can read a file via Makemap Hardlink of OpenSMTPD, in order to obtain sensitive information.
Vulnerable systems: Fedora, OpenBSD, Ubuntu, Unix (platform) ~ not comprehensive.
Severity of this threat: 2/4.
Creation date: 03/03/2020.
Références of this weakness: CVE-2020-8793, FEDORA-2020-270ef80e9e, FEDORA-2020-a861033a4d, USN-4294-1, VIGILANCE-VUL-31718.

Description of the vulnerability 

A local attacker can read a file via Makemap Hardlink of OpenSMTPD, in order to obtain sensitive information.
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This computer threat alert impacts software or systems such as Fedora, OpenBSD, Ubuntu, Unix (platform) ~ not comprehensive.

Our Vigil@nce team determined that the severity of this weakness announce is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this computer weakness bulletin.

Solutions for this threat 

OpenSMTPD: version 6.6.4.
The version 6.6.4 is fixed:
  https://www.opensmtpd.org/

Fedora: new opensmtpd packages.
New packages are available:
  Fedora 30: opensmtpd 6.6.2p1-1.fc30
  Fedora 31: opensmtpd 6.6.2p1-1.fc31

OpenBSD: patch for OpenSMTPD Multi-line Response.
A patch is available:
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/031_smtpd_envelope.patch.sig
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.6/common/021_smtpd_envelope.patch.sig

Ubuntu: new opensmtpd packages.
New packages are available:
  Ubuntu 19.10: opensmtpd 6.0.3p1-6ubuntu0.2
  Ubuntu 18.04 LTS: opensmtpd 6.0.3p1-1ubuntu0.2
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