[ASA-201908-18] dovecot: arbitrary code execution

[Jelle van der Waa]

Arch Linux Security Advisory ASA-201908-18
==========================================

Severity: Critical
Date    : 2019-08-28
CVE-ID  : CVE-2019-11500
Package : dovecot
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1026

Summary
=======

The package dovecot before version 2.3.7.2-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 2.3.7.2-1.

# pacman -Syu "dovecot>=2.3.7.2-1"

The problem has been fixed upstream in version 2.3.7.2.

Workaround
==========

None.

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

IMAP and ManageSieve protocol parsers in Dovecot before 2.3.7.2 and
Pigeonhole before 0.5.7.2 do not properly handle NUL byte when scanning
data in quoted strings, leading to out of bounds heap memory writes.

Impact
======

A remote, unauthenticated attacker can access sensitive information or
execute arbitrary code on the affected host via a crafted IMAP command.

References
==========

https://dovecot.org/pipermail/dovecot-news/2019-August/000418.html
https://github.com/dovecot/core/commit/85fcb895ca7f0bcb8ee72047fe0e1e78532ff90b
https://github.com/dovecot/core/commit/f904cbdfec25582bc5e2a7435bf82ff769f2526a
https://github.com/dovecot/pigeonhole/commit/7ce9990a5e6ba59e89b7fe1c07f574279aed922c
https://github.com/dovecot/pigeonhole/commit/4a299840cdb51f61f8d1ebc0210b19c40dfbc1cc
https://security.archlinux.org/CVE-2019-11500
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