[arch-security] [Arch Linux Security Advisory ASA-201412-2] openvpn: denial of service

[Levente Polyak]

Arch Linux Security Advisory ASA-201412-2
=========================================

Severity: High
Date    : 2014-12-02
CVE-ID  : CVE-2014-8104
Package : openvpn
Type    : denial of service
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE-2014

Summary
=======

The package openvpn before version 2.3.6-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 2.3.6-1.

# pacman -Syu "openvpn>=2.3.6-1"

The problem has been fixed upstream [0] in version 2.3.6.

Workaround
==========

None.

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

It was discovered that an authenticated client could trigger an ASSERT()
in OpenVPN by sending a too-short control channel packet to the server.
This could cause the OpenVPN server to crash and deny access to the VPN
to other legitimate users.

Impact
======

A remote authenticated attacker could send specially crafted packets
that could cause the OpenVPN server to crash leading to denial of
service of other legitimate users.

References
==========

[0] https://github.com/OpenVPN/openvpn/commit/c5590a
https://access.redhat.com/security/cve/CVE-2014-8104
https://forums.openvpn.net/topic17625.html
https://bugs.archlinux.org/task/42975

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