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

Critical Nessus Plugin ID 89819


The remote Red Hat host is missing a security update.


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.

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)


Update the affected rhev-hypervisor7 package.

See Also







Plugin Details

Severity: Critical

ID: 89819

File Name: redhat-RHSA-2016-0379.nasl

Version: $Revision: 2.14 $

Type: local

Agent: unix

Published: 2016/03/10

Modified: 2017/01/10

Dependencies: 12634

Risk Information

Risk Factor: Critical


Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C


Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:rhev-hypervisor7, cpe:/o:redhat:enterprise_linux:6

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2016/03/09

Reference Information

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

OSVDB: 133715, 135121, 135149, 135150, 135151

RHSA: 2016:0379