RHSA-2015:0197 - Security Advisory

Topic

Updated rhevm-spice-client packages that fix two security issues and
several bugs are now available for Red Hat Enterprise Virtualization
Manager 3.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

Description

Red Hat Enterprise Virtualization Manager provides access to virtual
machines using SPICE. These SPICE client packages provide the SPICE client
and usbclerk service for both Windows 32-bit operating systems and Windows
64-bit operating systems.

A race condition was found in the way OpenSSL handled ServerHello messages
with an included Supported EC Point Format extension. A malicious server
could possibly use this flaw to cause a multi-threaded TLS/SSL client using
OpenSSL to write into freed memory, causing the client to crash or execute
arbitrary code. (CVE-2014-3509)

A flaw was found in the way OpenSSL handled fragmented handshake packets.
A man-in-the-middle attacker could use this flaw to force a TLS/SSL server
using OpenSSL to use TLS 1.0, even if both the client and the server
supported newer protocol versions. (CVE-2014-3511)

This update also fixes the following bugs:

• Previously, various clipboard managers, operating on the client or on the

guest, would occasionally lose synchronization, which resulted in clipboard
data loss and the SPICE console freezing. Now, spice-gtk have been patched,
such that clipboard synchronization does not freeze the SPICE console
anymore. (BZ#1083489)

• Prior to this update, when a SPICE console was launched from the Red Hat

Enterprise Virtualization User Portal with the 'Native Client' invocation
method and 'Open in Full Screen' selected, the displays of the guest
virtual machine were not always configured to match the client displays.
After this update, the SPICE console will show a full-screen guest display
for each client monitor. (BZ#1076243)

• A difference in behavior between Linux and Windows clients caused an

extra nul character to be sent when pasting text in a guest machine from a
Windows client. This invisible character was visible in some Java
applications. With this update, the extra nul character is removed from
text strings and no more extraneous character would appear. (BZ#1090122)

• Previously, If the clipboard is of type image/bmp, and the data is of 0

size, GTK+ will crash. With this update, the data size is checked first,
and GTK+ no longer crashes when clipboard is of type image/bmp, and the
data is of 0 size. (BZ#1090433)

• Modifier-only key combinations cannot be registered by users as hotkeys

so if a user tries to set a modifier-only key sequence (for example,
'ctrl+alt') as the hotkey for releasing the cursor, it will fail, and the
user will be able to release the cursor from the window. With this update,
when a modifier-only hotkey is attempted to be registered, it will fall
back to the default cursor-release sequence (which happens to be
'ctrl+alt'). (BZ#985319)

• Display configuration sometimes used outdated information about the

position of the remote-viewer windows in order to align and configure the
guest displays. Occasionally, this caused the guest displays to became
unexpectedly swapped when a window is resized. With this update,
remote-viewer will always use the current window locations to align
displays, rather than using a possibly outdated cached location
information. (BZ#1018182)

All rhevm-spice-client users are advised to upgrade to these updated
packages, which contain backported patches to correct these issues.

Solution

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

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/articles/11258

Affected Products

• Red Hat Virtualization 3.5 x86_64

Fixes

• BZ - 1018145 - --full-screen=auto-conf sometimes (but frequently) doesn't work correctly
• BZ - 1018182 - primary monitor is switched if some screen gets bigger then current primary screen
• BZ - 1076243 - [BUG] RHEV SPICE console not opening in full screen or detecting resolution by default
• BZ - 1083489 - [SPICE][BUG] Spice session freezes randomly
• BZ - 1090122 - Pasting into java apps inserts unprintable character
• BZ - 1090433 - [GTK][BUG] win32: add more clipboard data checks to avoid crash
• BZ - 1103366 - Rebase virt-viewer to 0.6.0
• BZ - 1105650 - Fix windows productversion to fit -z releases
• BZ - 1115445 - in About dialog, hyphen version-build dividing hyphen is missing
• BZ - 1127498 - CVE-2014-3509 openssl: race condition in ssl_parse_serverhello_tlsext
• BZ - 1127504 - CVE-2014-3511 openssl: TLS protocol downgrade attack

CVEs

• CVE-2014-3511
• CVE-2014-3509

References

• https://access.redhat.com/security/updates/classification/#moderate