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AUSCERT External Security Bulletin Redistribution
ESB-2015.0250
Moderate: libvncserver security update
3 February 2015
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: libvncserver
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 6
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2014-6055 CVE-2014-6051
Reference: ESB-2014.2256
ESB-2014.1783
Original Bulletin:
https://rhn.redhat.com/errata/RHSA-2015-0113.html
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Red Hat Security Advisory
Synopsis: Moderate: libvncserver security update
Advisory ID: RHSA-2015:0113-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-0113.html
Issue date: 2015-02-02
CVE Names: CVE-2014-6051 CVE-2014-6055
=====================================================================
1. Summary:
Updated libvncserver packages that fix two security issues are now
available for Red Hat Enterprise Linux 6.5 Extended Update Support.
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 Server EUS (v. 6.5) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 6.5) - i386, ppc64, s390x, 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)
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
1144293 - CVE-2014-6055 libvncserver: server stacked-based buffer overflow flaws in file transfer handling
6. Package List:
Red Hat Enterprise Linux Server EUS (v. 6.5):
Source:
libvncserver-0.9.7-7.el6_5.1.src.rpm
i386:
libvncserver-0.9.7-7.el6_5.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_5.1.i686.rpm
ppc64:
libvncserver-0.9.7-7.el6_5.1.ppc64.rpm
libvncserver-debuginfo-0.9.7-7.el6_5.1.ppc64.rpm
s390x:
libvncserver-0.9.7-7.el6_5.1.s390x.rpm
libvncserver-debuginfo-0.9.7-7.el6_5.1.s390x.rpm
x86_64:
libvncserver-0.9.7-7.el6_5.1.x86_64.rpm
libvncserver-debuginfo-0.9.7-7.el6_5.1.x86_64.rpm
Red Hat Enterprise Linux Server Optional EUS (v. 6.5):
Source:
libvncserver-0.9.7-7.el6_5.1.src.rpm
i386:
libvncserver-debuginfo-0.9.7-7.el6_5.1.i686.rpm
libvncserver-devel-0.9.7-7.el6_5.1.i686.rpm
ppc64:
libvncserver-0.9.7-7.el6_5.1.ppc.rpm
libvncserver-debuginfo-0.9.7-7.el6_5.1.ppc.rpm
libvncserver-debuginfo-0.9.7-7.el6_5.1.ppc64.rpm
libvncserver-devel-0.9.7-7.el6_5.1.ppc.rpm
libvncserver-devel-0.9.7-7.el6_5.1.ppc64.rpm
s390x:
libvncserver-0.9.7-7.el6_5.1.s390.rpm
libvncserver-debuginfo-0.9.7-7.el6_5.1.s390.rpm
libvncserver-debuginfo-0.9.7-7.el6_5.1.s390x.rpm
libvncserver-devel-0.9.7-7.el6_5.1.s390.rpm
libvncserver-devel-0.9.7-7.el6_5.1.s390x.rpm
x86_64:
libvncserver-0.9.7-7.el6_5.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_5.1.i686.rpm
libvncserver-debuginfo-0.9.7-7.el6_5.1.x86_64.rpm
libvncserver-devel-0.9.7-7.el6_5.1.i686.rpm
libvncserver-devel-0.9.7-7.el6_5.1.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-2014-6055
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 2015 Red Hat, Inc.
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