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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: libvncserver security update
Advisory ID:       RHSA-2014:1826-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2014-1826.html
Issue date:        2014-11-11
CVE Names:         CVE-2014-6051 CVE-2014-6052 CVE-2014-6053 
                   CVE-2014-6054 CVE-2014-6055 
=====================================================================

1. Summary:

Updated libvncserver packages that fix multiple security issues are now
available for Red Hat Enterprise Linux 6 and 7.

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server (v. 7) - x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

LibVNCServer is a library that allows for easy creation of VNC server or
client functionality.

An integer overflow flaw, leading to a heap-based buffer overflow, was
found in the way screen sizes were handled by LibVNCServer. A malicious VNC
server could use this flaw to cause a client to crash or, potentially,
execute arbitrary code in the client. (CVE-2014-6051)

A NULL pointer dereference flaw was found in LibVNCServer's framebuffer
setup. A malicious VNC server could use this flaw to cause a VNC client to
crash. (CVE-2014-6052)

A NULL pointer dereference flaw was found in the way LibVNCServer handled
certain ClientCutText message. A remote attacker could use this flaw to
crash the VNC server by sending a specially crafted ClientCutText message
from a VNC client. (CVE-2014-6053)

A divide-by-zero flaw was found in the way LibVNCServer handled the scaling
factor when it was set to "0". A remote attacker could use this flaw to
crash the VNC server using a malicious VNC client. (CVE-2014-6054)

Two stack-based buffer overflow flaws were found in the way LibVNCServer
handled file transfers. A remote attacker could use this flaw to crash the
VNC server using a malicious VNC client. (CVE-2014-6055)

Red Hat would like to thank oCERT for reporting these issues. oCERT
acknowledges Nicolas Ruff as the original reporter.

All libvncserver users are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. All running
applications linked against libvncserver must be restarted for this update
to take effect.

4. 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

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

1144287 - CVE-2014-6051 libvncserver: integer overflow flaw, leading to a heap-based buffer overflow in screen size handling
1144288 - CVE-2014-6052 libvncserver: NULL pointer dereference flaw in framebuffer setup
1144289 - CVE-2014-6053 libvncserver: server NULL pointer dereference flaw in ClientCutText message handling
1144291 - CVE-2014-6054 libvncserver: server divide-by-zero flaw in scaling factor handling
1144293 - CVE-2014-6055 libvncserver: server stacked-based buffer overflow flaws in file transfer handling

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
libvncserver-0.9.7-7.el6_6.1.src.rpm

i386:
libvncserver-0.9.7-7.el6_6.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.i686.rpm

x86_64:
libvncserver-0.9.7-7.el6_6.1.x86_64.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
libvncserver-debuginfo-0.9.7-7.el6_6.1.i686.rpm
libvncserver-devel-0.9.7-7.el6_6.1.i686.rpm

x86_64:
libvncserver-0.9.7-7.el6_6.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.x86_64.rpm
libvncserver-devel-0.9.7-7.el6_6.1.i686.rpm
libvncserver-devel-0.9.7-7.el6_6.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
libvncserver-0.9.7-7.el6_6.1.src.rpm

i386:
libvncserver-0.9.7-7.el6_6.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.i686.rpm

ppc64:
libvncserver-0.9.7-7.el6_6.1.ppc64.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.ppc64.rpm

s390x:
libvncserver-0.9.7-7.el6_6.1.s390x.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.s390x.rpm

x86_64:
libvncserver-0.9.7-7.el6_6.1.x86_64.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
libvncserver-debuginfo-0.9.7-7.el6_6.1.i686.rpm
libvncserver-devel-0.9.7-7.el6_6.1.i686.rpm

ppc64:
libvncserver-0.9.7-7.el6_6.1.ppc.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.ppc.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.ppc64.rpm
libvncserver-devel-0.9.7-7.el6_6.1.ppc.rpm
libvncserver-devel-0.9.7-7.el6_6.1.ppc64.rpm

s390x:
libvncserver-0.9.7-7.el6_6.1.s390.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.s390.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.s390x.rpm
libvncserver-devel-0.9.7-7.el6_6.1.s390.rpm
libvncserver-devel-0.9.7-7.el6_6.1.s390x.rpm

x86_64:
libvncserver-0.9.7-7.el6_6.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.x86_64.rpm
libvncserver-devel-0.9.7-7.el6_6.1.i686.rpm
libvncserver-devel-0.9.7-7.el6_6.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
libvncserver-0.9.7-7.el6_6.1.src.rpm

i386:
libvncserver-0.9.7-7.el6_6.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.i686.rpm

x86_64:
libvncserver-0.9.7-7.el6_6.1.x86_64.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
libvncserver-debuginfo-0.9.7-7.el6_6.1.i686.rpm
libvncserver-devel-0.9.7-7.el6_6.1.i686.rpm

x86_64:
libvncserver-0.9.7-7.el6_6.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_6.1.x86_64.rpm
libvncserver-devel-0.9.7-7.el6_6.1.i686.rpm
libvncserver-devel-0.9.7-7.el6_6.1.x86_64.rpm

Red Hat Enterprise Linux Client (v. 7):

Source:
libvncserver-0.9.9-9.el7_0.1.src.rpm

x86_64:
libvncserver-0.9.9-9.el7_0.1.i686.rpm
libvncserver-0.9.9-9.el7_0.1.x86_64.rpm
libvncserver-debuginfo-0.9.9-9.el7_0.1.i686.rpm
libvncserver-debuginfo-0.9.9-9.el7_0.1.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
libvncserver-debuginfo-0.9.9-9.el7_0.1.i686.rpm
libvncserver-debuginfo-0.9.9-9.el7_0.1.x86_64.rpm
libvncserver-devel-0.9.9-9.el7_0.1.i686.rpm
libvncserver-devel-0.9.9-9.el7_0.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
libvncserver-0.9.9-9.el7_0.1.src.rpm

x86_64:
libvncserver-0.9.9-9.el7_0.1.i686.rpm
libvncserver-0.9.9-9.el7_0.1.x86_64.rpm
libvncserver-debuginfo-0.9.9-9.el7_0.1.i686.rpm
libvncserver-debuginfo-0.9.9-9.el7_0.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

x86_64:
libvncserver-debuginfo-0.9.9-9.el7_0.1.i686.rpm
libvncserver-debuginfo-0.9.9-9.el7_0.1.x86_64.rpm
libvncserver-devel-0.9.9-9.el7_0.1.i686.rpm
libvncserver-devel-0.9.9-9.el7_0.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
libvncserver-0.9.9-9.el7_0.1.src.rpm

x86_64:
libvncserver-0.9.9-9.el7_0.1.i686.rpm
libvncserver-0.9.9-9.el7_0.1.x86_64.rpm
libvncserver-debuginfo-0.9.9-9.el7_0.1.i686.rpm
libvncserver-debuginfo-0.9.9-9.el7_0.1.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
libvncserver-debuginfo-0.9.9-9.el7_0.1.i686.rpm
libvncserver-debuginfo-0.9.9-9.el7_0.1.x86_64.rpm
libvncserver-devel-0.9.9-9.el7_0.1.i686.rpm
libvncserver-devel-0.9.9-9.el7_0.1.x86_64.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-2014-6051
https://access.redhat.com/security/cve/CVE-2014-6052
https://access.redhat.com/security/cve/CVE-2014-6053
https://access.redhat.com/security/cve/CVE-2014-6054
https://access.redhat.com/security/cve/CVE-2014-6055
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2014 Red Hat, Inc.
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