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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(FreeBSD Issues Fix) OpenSSL Multiple Bugs Let Remote Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1036974
SecurityTracker URL:  http://securitytracker.com/id/1036974
CVE Reference:   CVE-2016-7052   (Links to External Site)
Date:  Oct 10 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Multiple vulnerabilities were reported in OpenSSL. A remote user can cause the target service or application to crash.

A remote user can send a specially crafted SHA512 TLS session ticket to trigger an out-of-bounds memory read error and cause the target server to crash [CVE-2016-6302].

A remote user can trigger an integer overflow in the MDC2_Update() function in 'crypto/mdc2/mdc2dgst.c' and cause the target service to crash in certain cases [CVE-2016-6303].

A remote user can trigger an out-of-bounds memory read error in the processing of certain TLS/SSL protocol handshake messages and cause the target application or service to crash [CVE-2016-6306]. Version 1.1.0 is not affected.

A remote user can trigger a memory allocation error in tls_get_message_header() to temporarily consume excessive memory resources on the target system [CVE-2016-6307]. DTLS users are not affected. Version 1.1.0 is affected.

A remote user can trigger a memory allocation error in dtls1_preprocess_fragment() to temporarily consume excessive memory resources on the target system [CVE-2016-6308]. TLS users are not affected. Version 1.1.0 is affected.

Shi Lei (Gear Team, Qihoo 360 Inc.) reported these vulnerabilities.

Impact:   A remote user can cause the target service or application to crash.
Solution:   FreeBSD has issued a fix for CVE-2016-7052.

The FreeBSD advisory is available at:

https://security.FreeBSD.org/advisories/FreeBSD-SA-16:27.openssl.asc

Vendor URL:  security.FreeBSD.org/advisories/FreeBSD-SA-16:27.openssl.asc (Links to External Site)
Cause:   Access control error, Boundary error, Resource error
Underlying OS:  UNIX (FreeBSD)
Underlying OS Comments:  11.0

Message History:   This archive entry is a follow-up to the message listed below.
Sep 23 2016 OpenSSL Multiple Bugs Let Remote Users Cause the Target Service to Crash



 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-16:27.openssl

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================
FreeBSD-SA-16:27.openssl                                    Security Advisory
                                                          The FreeBSD Project

Topic:          Regression in OpenSSL suite

Category:       contrib
Module:         openssl
Announced:      2016-10-10
Credits:        OpenSSL Project
Affects:        All supported versions of FreeBSD.
Corrected:      2016-09-26 14:30:19 UTC (stable/11, 11.0-STABLE)
                2016-09-26 20:26:19 UTC (releng/11.0, 11.0-RELEASE-p1)
CVE Name:       CVE-2016-7052

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.

I.   Background

FreeBSD includes software from the OpenSSL Project.  The OpenSSL Project is
a collaborative effort to develop a robust, commercial-grade, full-featured
Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3)
and Transport Layer Security (TLS v1) protocols as well as a full-strength
general purpose cryptography library.

II.  Problem Description

The OpenSSL version included in FreeBSD 11.0-RELEASE is 1.0.2i.  The version
has bug fix for CVE-2016-7052, which should have included CRL sanity check,
but the check was omitted.

III. Impact

Any attempt to use CRLs in OpenSSL 1.0.2i will crash with a null pointer
exception.

IV.  Workaround

No workaround is available.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.

Restart all daemons that use the library, or reboot the system.

2) To update your vulnerable system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

Restart all daemons that use the library, or reboot the system.

3) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch https://security.FreeBSD.org/patches/SA-16:27/openssl.patch
# fetch https://security.FreeBSD.org/patches/SA-16:27/openssl.patch.asc
# gpg --verify openssl.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

Restart all daemons that use the library, or reboot the system.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/11/                                                        r306343
releng/11.0/                                                      r306354
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://www.openssl.org/news/secadv/20160926.txt>

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7052>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-16:27.openssl.asc>
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