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Gentoo Linux Security Advisory GLSA 201709-04
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https://security.gentoo.org/
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Severity: Normal
Title: mod_gnutls: Certificate validation error
Date: September 17, 2017
Bugs: #541038
ID: 201709-04

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Synopsis
========

A vulnerability in mod_gnutls allows remote attackers to spoof clients
via crafted certificates.

Background
==========

mod_gnutls is an extension for ​Apache’s httpd. It uses the ​GnuTLS
library to provide HTTPS. It supports some protocols and features that
mod_ssl does not.

Affected packages
=================

——————————————————————-
Package / Vulnerable / Unaffected
——————————————————————-
1 www-apache/mod_gnutls < 0.7.3 >= 0.7.3

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

It was discovered that the authentication hook in mod_gnutls does not
validate client’s certificates even when option “GnuTLSClientVerify” is
set to “require”.

Impact
======

A remote attacker could present a crafted certificate and spoof clients
data.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All mod_gnutls users should upgrade to the latest version:

# emerge –sync
# emerge –ask –oneshot –verbose “>=www-apache/mod_gnutls-0.7.3”

References
==========

[ 1 ] CVE-2015-2091
https://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-2091

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

https://security.gentoo.org/glsa/201709-04

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users’ machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2017 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons – Attribution / Share Alike license.

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