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Gentoo Linux Security Advisory                           GLSA 201703-04
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: cURL: Certificate validation error
     Date: March 28, 2017
     Bugs: #610572
       ID: 201703-04

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Synopsis
========

A coding error has been found in cURL, causing the TLS Certificate
Status Request extension check to always return true.

Background
==========

cURL is a tool and libcurl is a library for transferring data with URL
syntax.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-misc/curl                < 7.53.0                  >= 7.53.0

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

cURL and applications linked against libcurl support "OCSP stapling",
also known as the TLS Certificate Status Request extension (using the
CURLOPT_SSL_VERIFYSTATUS option). When telling cURL to use this
feature, it uses that TLS extension to ask for a fresh proof of the
server's certificate's validity. If the server doesn't support the
extension, or fails to provide said proof, cURL is expected to return
an error.
Due to a coding mistake, the code that checks for a test success or
failure, ends up always thinking there's valid proof, even when there
is none or if the server doesn't support the TLS extension in question.

Impact
======

Due to the error, a user maybe does not detect when a server's
certificate goes invalid or otherwise be mislead that the server is in
a better shape than it is in reality.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All cURL users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-misc/curl-7.53.0"

References
==========

[ 1 ] CVE-2017-2629
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-2629

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

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

 https://security.gentoo.org/glsa/201703-04

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.

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


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