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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.

https://creativecommons.org/licenses/by-sa/2.5/