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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(FreeBSD Issues Fix) OpenSSL Multiple Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Information
SecurityTracker Alert ID:  1034297
SecurityTracker URL:  http://securitytracker.com/id/1034297
CVE Reference:   CVE-2015-3194, CVE-2015-3195, CVE-2015-3196   (Links to External Site)
Date:  Dec 5 2015
Impact:   Denial of service via network, Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to versions 0.9.8zh, 1.0.0t, 1.0.1q, 1.0.2e
Description:   Multiple vulnerabilities were reported in OpenSSL. A remote user can cause the target service to crash. A remote user can obtain potentially sensitive information on the target system.

A remote server can send a specially crafted ServerKeyExchange for an anonymous DH ciphersuite with the value of p set to 0 to potentially cause the target service to crash [CVE-2015-1794]. Version 1.0.2 is affected.

The vendor was notified on August 3, 2015.

Guy Leaver (Cisco) reported this vulnerability.

A remote user can exploit a carry propagation flaw in BN_mod_exp() to potentially determine information about the private key in certain situations [CVE-2015-3193].

Systems configured for persistent DH parameters and sharing a private key between multiple clients are affected. Version 1.0.2 is affected.

The vendor was notified on August 13, 2015.

Hanno Bock reported this vulnerability.

A remote user can send a certificate with a specially crafted ASN.1 signature that uses the RSA PSS algorithm and does not contain the mast generation function parameter to trigger a null pointer dereference and crash [CVE-2015-3194]. Versions 1.0.1 and 1.0.2 are affected.

The vendor was notified on August 27 2015.

Loic Jonas Etienne (Qnective AG) reported this vulnerability.

A remote user can supply a specially crafted X509_ATTRIBUTE structure to trigger a memory leak and potentially disclose sensitive information [CVE-2015-3195]. Applications that read PKCS#7 or CMS data from untrusted sources are affected. SSL/TLS is not affected.

The vendor was notified on November 9, 2015.

Adam Langley (Google/BoringSSL) reported this vulnerability.

A remote user can send send PSK identity hints to a multi-threaded client to trigger a race condition and then a double free memory error and cause the target service to crash [CVE-2015-3196]. Versions 1.0.0, 1.0.1 (prior to 1.0.1p), and 1.0.2 (prior to 1.0.2d) are affected.

Impact:   A remote user can cause the target service to crash.

A remote user can obtain potentially sensitive information on the target system.

Solution:   FreeBSD has issued a fix for CVE-2015-3194, CVE-2015-3195, and CVE-2015-3196.

The FreeBSD advisory is available at:

https://security.FreeBSD.org/advisories/FreeBSD-SA-15:26.openssl.asc

Vendor URL:  security.FreeBSD.org/advisories/FreeBSD-SA-15:26.openssl.asc (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  UNIX (FreeBSD)
Underlying OS Comments:  9.3, 10.1, 10.2

Message History:   This archive entry is a follow-up to the message listed below.
Dec 5 2015 OpenSSL Multiple Bugs Let Remote Users Deny Service and Obtain Potentially Sensitive Information



 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-15:26.openssl

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

=============================================================================
FreeBSD-SA-15:26.openssl                                    Security Advisory
                                                          The FreeBSD Project

Topic:          Multiple OpenSSL vulnerabilities

Category:       contrib
Module:         openssl
Announced:      2015-12-05
Affects:        All supported versions of FreeBSD.
Corrected:      2015-12-03 21:18:48 UTC (stable/10, 10.2-STABLE)
                2015-12-05 09:53:58 UTC (releng/10.2, 10.2-RELEASE-p8)
                2015-12-05 09:53:58 UTC (releng/10.1, 10.1-RELEASE-p25)
                2015-12-03 21:24:40 UTC (stable/9, 9.3-STABLE)
                2015-12-05 09:53:58 UTC (releng/9.3, 9.3-RELEASE-p31)
CVE Name:       CVE-2015-3194, CVE-2015-3195, CVE-2015-3196

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 signature verification routines will crash with a NULL pointer dereference
if presented with an ASN.1 signature using the RSA PSS algorithm and absent
mask generation function parameter. [CVE-2015-3194]

When presented with a malformed X509_ATTRIBUTE structure, OpenSSL will leak
memory. [CVE-2015-3195]

If PSK identity hints are received by a multi-threaded client then the values
are incorrectly updated in the parent SSL_CTX structure.  [CVE-2015-3196]

III. Impact

A remote attacker who can present a specifically crafted certificate may
cause a OpenSSL client or server application that performs certificate
signature verification to crash with a NULL pointer dereference, resulting
in a Denial of Service. [CVE-2015-3194]  This affects FreeBSD 10.x only.

An attacker who is able to feed specifically crafted PKCS#7/CMS data to an
OpenSSL application can cause memory leak which may eventually result in a
Denial of Service. [CVE-2015-3195]

A remote attacker who can send PSK identity hints to a multi-thread client
may trigger a double fault of hint data, which may lead to crash the client
application. [CVE-2015-3196].  This affects FreeBSD 10.1 only.

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.

Reboot is optional but recommended.

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

Reboot is optional but recommended.

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.

[FreeBSD 9.3]
# fetch https://security.FreeBSD.org/patches/SA-15:26/openssl-9.3.patch
# fetch https://security.FreeBSD.org/patches/SA-15:26/openssl-9.3.patch.asc
# gpg --verify openssl-9.3.patch.asc

[FreeBSD 10.1]
# fetch https://security.FreeBSD.org/patches/SA-15:26/openssl-10.1.patch
# fetch https://security.FreeBSD.org/patches/SA-15:26/openssl-10.1.patch.asc
# gpg --verify openssl-10.1.patch.asc

[FreeBSD 10.2]
# fetch https://security.FreeBSD.org/patches/SA-15:26/openssl-10.2.patch
# fetch https://security.FreeBSD.org/patches/SA-15:26/openssl-10.2.patch.asc
# gpg --verify openssl-10.2.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 deamons using 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/9/                                                         r291722
releng/9.3/                                                       r291854
stable/10/                                                        r291721
releng/10.1/                                                      r291854
releng/10.2/                                                      r291854
- -------------------------------------------------------------------------

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/20151203.txt>

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3194>

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3195>

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3196>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:26.openssl.asc>
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