[ASA-202002-13] opensmtpd: arbitrary command execution

[Remi Gacogne]

Arch Linux Security Advisory ASA-202002-13
==========================================

Severity: Critical
Date    : 2020-02-29
CVE-ID  : CVE-2020-8794
Package : opensmtpd
Type    : arbitrary command execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1105

Summary
=======

The package opensmtpd before version 6.6.4p1-1 is vulnerable to
arbitrary command execution.

Resolution
==========

Upgrade to 6.6.4p1-1.

# pacman -Syu "opensmtpd>=6.6.4p1-1"

The problem has been fixed upstream in version 6.6.4p1.

Workaround
==========

None.

Description
===========

An out-of-bounds read vulnerability has been found in the client-side
code of OpenSMTPD <= 6.6.3p1, leading to arbitrary command execution
via a crafted SMTP transaction.

Impact
======

A remote attacker is able to execute arbitrary commands as root on the
affected host.

References
==========

https://www.qualys.com/2020/02/24/cve-2020-8794/lpe-rce-opensmtpd-default-install.txt
https://security.archlinux.org/CVE-2020-8794

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