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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Enterprise Virtualization) OpenSSL Flaws Let Remote Users Deny Service and Decrypt TLS Sessions in Certain Cases
SecurityTracker Alert ID:  1035243
SecurityTracker URL:  http://securitytracker.com/id/1035243
CVE Reference:   CVE-2016-0702, CVE-2016-0705, CVE-2016-0797, CVE-2016-0800   (Links to External Site)
Date:  Mar 10 2016
Impact:   Denial of service via network, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Multiple vulnerabilities were reported in OpenSSL. A remote user can decrypt TLS sessions in certain cases. A remote user can cause denial of service conditions on the target system. Red Hat Enterprise Virtualization is affected.

A remote user can decrypt TLS sessions in certain cases by using a server that supports SSLv2 and EXPORT cipher suites as a Bleichenbacher RSA padding oracle [CVE-2016-0800]. This attack is known as a DROWN attack.

Systems with a private key used on another server for any protocol that allows SSLv2 connections are affected.

Systems running versions prior to 1.0.2a, 1.0.1m, 1.0.0r, and 0.9.8zf (released on March 19, 2015) can be exploited more readily.

The original advisory is available at:

https://drownattack.com/drown-attack-paper.pdf

Nimrod Aviram, Sebastian Schinzel, Juraj Somorovsky, Nadia Heninger, Maik Dankel, Jens Steube, Luke Valenta, David Adrian, J. Alex Halderman, Viktor Dukhovni, Emilia Kasper, Shaanan Cohney, Susanne Engels, Christof Paar, and Yuval Shavitt reported this vulnerability.

A remote user can create a specially crafted private DSA key that, when processed by OpenSSL, will trigger a double free memory error and cause denial of service conditions [CVE-2016-0705].

Adam Langley (Google/BoringSSL) reported this vulnerability.

A remote user can supply a specially crafted username value to the target SRP server to trigger a memory leak [CVE-2016-0798].

Emilia Kasper of the OpenSSL development team reported this vulnerability.

A user can create specially crafted data (e.g., configuration file) that, when processed by OpenSSL, will trigger a null pointer dereference in the BN_hex2bn/BN_dec2bn() functions [CVE-2016-0797].

Guido Vranken reported this vulnerability.

A user can create specially crafted data that, when processed by OpenSSL, will trigger a memory error in BIO_*printf() functions [CVE-2016-0799].

Guido Vranken reported this vulnerability.

A local user can conduct a side-channel attack against a system based on the Intel Sandy-Bridge microarchitecture to potentially recover RSA keys [CVE-2016-0702].

Yuval Yarom, the University of Adelaide and NICTA, Daniel Genkin, Technion and Tel Aviv University, and Nadia Heninger, University of Pennsylvania, reported this vulnerability.

The SSLv2 's2_srvr.c' code does not ensure that a clear-key-length value is 0 for non-export ciphers. As a result, clear-key bytes can displace encrypted-key bytes, which can be exploited to conduct a key recovery attack [CVE-2016-0703].

Versions 1.0.2, 1.0.1l, 1.0.0q, and 0.9.8ze and prior versions are affected.

David Adrian and J. Alex Halderman of the University of Michigan reported this vulnerability.

The Bleichenbacher protection for export cipher suites in 's2_srvr.c' overwrites bytes incorrectly in the master-key, which may provide a Bleichenbacher oracle that can be used to decrypt sessions [CVE-2016-0704].

Versions 1.0.2, 1.0.1l, 1.0.0q, and 0.9.8ze and all prior versions are affected.

David Adrian and J. Alex Halderman of the University of Michigan reported this vulnerability.

A remote user can trigger an out-of-bounds memory write error in doapr_outch() in 'crypto/bio/b_print.c' to potentially execute arbitrary code on the target system [CVE-2016-2842].

Guido Vranken reported this vulnerability.

Impact:   A remote user can decrypt TLS sessions in certain cases.

A remote user can cause denial of service conditions.

A remote user can execute arbitrary code on the target system.

Solution:   Red Hat has issued a fix for CVE-2016-0702, CVE-2016-0705, CVE-2016-0797, and CVE-2016-0800 for Red Hat Enterprise Virtualization.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-0379.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-0379.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 7

Message History:   This archive entry is a follow-up to the message listed below.
Mar 1 2016 OpenSSL Flaws Let Remote Users Deny Service and Decrypt TLS Sessions in Certain Cases



 Source Message Contents

Subject:  [RHSA-2016:0379-01] Important: rhev-hypervisor security, bug fix and enhancement update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: rhev-hypervisor security, bug fix and enhancement update
Advisory ID:       RHSA-2016:0379-01
Product:           Red Hat Enterprise Virtualization
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-0379.html
Issue date:        2016-03-09
CVE Names:         CVE-2015-3197 CVE-2016-0702 CVE-2016-0705 
                   CVE-2016-0797 CVE-2016-0800 
=====================================================================

1. Summary:

An updated rhev-hypervisor package that fixes several security issues,
bugs, and enhancements is now available.

Red Hat Product Security has rated this update as having Important 
security impact. A Common Vulnerability Scoring System (CVSS) base 
score, which gives a detailed severity rating, is available from the 
CVE link in the References section.

2. Relevant releases/architectures:

RHEL 7-based RHEV-H - noarch
RHEV Hypervisor for RHEL-6 - noarch

3. Description:

The rhev-hypervisor package provides a Red Hat Enterprise 
Virtualization Hypervisor ISO disk image. The Red Hat Enterprise 
Virtualization Hypervisor is a dedicated Kernel-based Virtual Machine 
(KVM) hypervisor. It includes everything necessary to run and manage 
virtual machines: a subset of the Red Hat Enterprise Linux operating 
environment and the Red Hat Enterprise Virtualization Agent.

Note: Red Hat Enterprise Virtualization Hypervisor is only available 
for the Intel 64 and AMD64 architectures with virtualization 
extensions.

A padding oracle flaw was found in the Secure Sockets Layer version 
2.0 (SSLv2) protocol. An attacker could potentially use this flaw to 
decrypt RSA-encrypted cipher text from a connection using a newer 
SSL/TLS protocol version, allowing them to decrypt such connections. 
This cross-protocol attack is publicly referred to as DROWN. 
(CVE-2016-0800)

Note: This issue was addressed by disabling the SSLv2 protocol by 
default when using the 'SSLv23' connection methods, and removing 
support for weak SSLv2 cipher suites. For more information, refer to 
the knowledge base article linked in the References section.

A flaw was found in the way malicious SSLv2 clients could negotiate 
SSLv2 ciphers that have been disabled on the server. This could 
result in weak SSLv2 ciphers being used for SSLv2 connections, 
making them vulnerable to man-in-the-middle attacks. (CVE-2015-3197)

A side-channel attack was found that makes use of cache-bank 
conflicts on the Intel Sandy-Bridge microarchitecture. An attacker 
who has the ability to control code in a thread running on the same 
hyper-threaded core as the victim's thread that is performing 
decryption, could use this flaw to recover RSA private keys. 
(CVE-2016-0702)

A double-free flaw was found in the way OpenSSL parsed certain 
malformed DSA (Digital Signature Algorithm) private keys. An 
attacker could create specially crafted DSA private keys that, when 
processed by an application compiled against OpenSSL, could cause 
the application to crash. (CVE-2016-0705)

An integer overflow flaw, leading to a NULL pointer dereference or a
heap-based memory corruption, was found in the way some BIGNUM 
functions of OpenSSL were implemented. Applications that use these 
functions with large untrusted input could crash or, potentially, 
execute arbitrary code. (CVE-2016-0797)

Red Hat would like to thank the OpenSSL project for reporting these 
issues. Upstream acknowledges Nimrod Aviram and Sebastian Schinzel
as the original reporters of CVE-2016-0800 and CVE-2015-3197; Yuval
Yarom (University of Adelaide and NICTA), Daniel Genkin (Technion
and Tel Aviv University), Nadia Heninger (University of Pennsylvania)
as the original reporters of CVE-2016-0702; Adam Langley (Google/
BoringSSL) as the original reporter of CVE-2016-0705; and Guido
Vranken as the original reporter of CVE-2016-0797.

All openssl users are advised to upgrade to this updated package,
which contain backported patches to correct these issues. For the 
update to take effect, all services linked to the OpenSSL library 
must be restarted, or the system rebooted.

Changes to the rhev-hypervisor component:

* Previously, a race between services during boot prevented network 
configuration from upgrading correctly. The risk for the race has 
now been reduced significantly to allow the upgrade of the network 
configuration to complete correctly. (BZ#1194068)

* Previously, using the text user interface (TUI) to log in to the 
administrator account of Red Hat Enterprise Virtualization 
Hypervisor failed with a Python backtrace. This update makes the 
"six" module correctly importable under all circumstances, which 
ensures that logging in to Red Hat Enterprise Virtualization 
Hypervisor using TUI proceeds as expected. (BZ#1246836)

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1194068 - vdsm-3.5 network conf upgrade fails, due to `service network restart` by node
1236508 - [Tracker] Build RHEV-H for RHEV 3.6.0
1283498 - messages log flooded with 'Failed to reset devices.list on /machine.slice: Invalid argument'
1301846 - CVE-2015-3197 OpenSSL: SSLv2 doesn't block disabled ciphers
1302248 - RHEV-H 7.2 RC1: Remove "Beta" keyword from plymouth
1310593 - CVE-2016-0800 SSL/TLS: Cross-protocol attack on TLS using SSLv2 (DROWN)
1310596 - CVE-2016-0705 OpenSSL: Double-free in DSA code
1310599 - CVE-2016-0702 OpenSSL: Side channel attack on modular exponentiation
1311880 - CVE-2016-0797 OpenSSL: BN_hex2bn/BN_dec2bn NULL pointer deref/heap corruption

6. Package List:

RHEV Hypervisor for RHEL-6:

Source:
rhev-hypervisor7-7.2-20160302.1.el6ev.src.rpm

noarch:
rhev-hypervisor7-7.2-20160302.1.el6ev.noarch.rpm

RHEL 7-based RHEV-H:

Source:
rhev-hypervisor7-7.2-20160302.1.el7ev.src.rpm

noarch:
rhev-hypervisor7-7.2-20160302.1.el7ev.noarch.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-3197
https://access.redhat.com/security/cve/CVE-2016-0702
https://access.redhat.com/security/cve/CVE-2016-0705
https://access.redhat.com/security/cve/CVE-2016-0797
https://access.redhat.com/security/cve/CVE-2016-0800
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc.
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