[ASA-201908-4] exim: arbitrary code execution

[Remi Gacogne]

Arch Linux Security Advisory ASA-201908-4
=========================================

Severity: Critical
Date    : 2019-08-05
CVE-ID  : CVE-2019-13917
Package : exim
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1011

Summary
=======

The package exim before version 4.92.1-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 4.92.1-1.

# pacman -Syu "exim>=4.92.1-1"

The problem has been fixed upstream in version 4.92.1.

Workaround
==========

None.

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

Exim 4.85 through 4.92 (fixed in 4.92.1) allows remote code execution
as root in some unusual configurations that use the ${sort } expansion
for items that can be controlled by an attacker (e.g., $local_part or
$domain).

Impact
======

A remote attacker can, in some unusual configurations, execute
arbitrary code via a crafted e-mail.

References
==========

https://seclists.org/oss-sec/2019/q3/63
https://lists.exim.org/lurker/message/20190725.090419.d506f736.en.html
https://security.archlinux.org/CVE-2019-13917

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