This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
--dCaGeSVMxVLlUmi3IMKam2AP4CVLfQuUW
Content-Type: text/plain; charset=utf-
Content-Transfer-Encoding: quoted-printable

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 201507-15
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                           https://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 Severity: Normal
    Title: OpenSSL: Alternate chains certificate forgery
     Date: July 10, 2015
     Bugs: #554172
       ID: 201507-15

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

Certain checks on untrusted certificates can be bypassed.

Background
==========

OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer
(SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general
purpose cryptography library.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-libs/openssl             < 1.0.1p                  >= 1.0.1p

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

During certificate verification, OpenSSL attempts to find an
alternative certificate chain if the first attempt to build such a
chain fails.

Impact
======

A remote attacker could cause certain checks on untrusted
certificates to be bypassed, such as the CA flag, enabling them to use
a valid leaf certificate to act as a CA and "issue" an invalid
certificate.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All OpenSSL users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.0.1p"

References
==========

[ 1 ] CVE-2015-1793
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-1793

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

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

 https://security.gentoo.org/glsa/201507-15

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 2015 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.

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


--dCaGeSVMxVLlUmi3IMKam2AP4CVLfQuUW
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"

-----BEGIN PGP SIGNATURE-----

iQEcBAEBCgAGBQJVn8K0AAoJECULev7WN52F3rEIAL1XNgvA0eVzcKThlfNB7nPu
P8OZkGxGHFU25LtGltitxppCvYBH4qpVbyHWI2O7Ni/ggGDwPILSYvoWLIu/qg+s
/MZbJ4IFy/RGtYT1mDgx638sjJ+yb9I1mu72v5hcGOovnq+p6p1yqr/68QYHNGDD
+lk9t8HL80aZbpInZpxlwmewXaikK1e3nC/CTSCkZJi45lDGD01mkYU755ckAVud
RZ3leGhyenFh/RVWhXAzeY7HsBBIMiWyzVY6DnUcr4ehMVijLJe7+reZuI5PrwuE
3RZY+YxzWf/FBPw0t8L3395mxb7/PcB7+Ty8+li/SrpevpiyUzVNxfmtOFUB0sk=
=uS+b
-----END PGP SIGNATURE-----

--dCaGeSVMxVLlUmi3IMKam2AP4CVLfQuUW--