[ASA-201802-6] exim: arbitrary code execution

[Jelle van der Waa]

Arch Linux Security Advisory ASA-201802-6
=========================================

Severity: High
Date    : 2018-02-12
CVE-ID  : CVE-2018-6789
Package : exim
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-608

Summary
=======

The package exim before version 4.90.1-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 4.90.1-1.

# pacman -Syu "exim>=4.90.1-1"

The problem has been fixed upstream in version 4.90.1.

Workaround
==========

None.

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

An issue was discovered in the base64d function in the SMTP listener in
Exim before 4.90.1. By sending a handcrafted message, a buffer overflow
may happen. This can be used to execute code remotely.

Impact
======

A remote attacker is able to execute arbitrary code on the affected
host by sending a crafted message.

References
==========

http://exim.org/static/doc/security/CVE-2018-6789.txt
https://marc.info/?l=oss-security&m=151828631632609
https://security.archlinux.org/CVE-2018-6789
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