RHEL 6 : rhev-hypervisor (RHSA-2016:0379) (DROWN)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing a security update.

Description :

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.

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)

See also :

https://www.redhat.com/security/data/cve/CVE-2015-3197.html
https://www.redhat.com/security/data/cve/CVE-2016-0702.html
https://www.redhat.com/security/data/cve/CVE-2016-0705.html
https://www.redhat.com/security/data/cve/CVE-2016-0797.html
https://www.redhat.com/security/data/cve/CVE-2016-0800.html
http://rhn.redhat.com/errata/RHSA-2016-0379.html

Solution :

Update the affected rhev-hypervisor7 package.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 89819 ()

Bugtraq ID:

CVE ID: CVE-2015-3197
CVE-2016-0702
CVE-2016-0705
CVE-2016-0797
CVE-2016-0800

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