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[gentoo-announce] [ GLSA 201703-04 ] cURL: Certificate validation error

Posted on 28 March 2017
Gentoo-announce

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From: Yury German <blueknight@gentoo.org>
To: gentoo-announce@lists.gentoo.org
Message-ID: <78557eaf-5d66-ab37-275a-dc313f607277@gentoo.org>
Subject: [ GLSA 201703-04 ] cURL: Certificate validation error

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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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