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AUSCERT External Security Bulletin Redistribution
ESB-2015.2886
Moderate: tigervnc security, bug fix, and enhancement update
23 November 2015
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: tigervnc
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 7
Red Hat Enterprise Linux WS/Desktop 7
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2014-8241 CVE-2014-8240
Original Bulletin:
https://rhn.redhat.com/errata/RHSA-2015-2233.html
Comment: This advisory references vulnerabilities in products which run on
platforms other than Red Hat. It is recommended that administrators
running tigervnc check for an updated version of the software for
their operating system.
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Red Hat Security Advisory
Synopsis: Moderate: tigervnc security, bug fix, and enhancement update
Advisory ID: RHSA-2015:2233-03
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2233.html
Issue date: 2015-11-19
CVE Names: CVE-2014-8240 CVE-2014-8241
=====================================================================
1. Summary:
Updated tigervnc packages that fix two security issues, several bugs, and
add various enhancements are now available for Red Hat Enterprise Linux 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) - noarch, x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Server (v. 7) - aarch64, noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, noarch, ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64
3. Description:
Virtual Network Computing (VNC) is a remote display system which allows
users to view a computing desktop environment not only on the machine where
it is running, but from anywhere on the Internet and from a wide variety of
machine architectures. TigerVNC is a suite of VNC servers and clients.
The tigervnc packages contain a client which allows users to connect to
other desktops running a VNC server.
An integer overflow flaw, leading to a heap-based buffer overflow, was
found in the way TigerVNC handled screen sizes. A malicious VNC server
could use this flaw to cause a client to crash or, potentially, execute
arbitrary code on the client. (CVE-2014-8240)
A NULL pointer dereference flaw was found in TigerVNC's XRegion.
A malicious VNC server could use this flaw to cause a client to crash.
(CVE-2014-8241)
The tigervnc packages have been upgraded to upstream version 1.3.1, which
provides a number of bug fixes and enhancements over the previous version.
(BZ#1199453)
This update also fixes the following bug:
* The position of the mouse cursor in the VNC session was not correctly
communicated to the VNC viewer, resulting in cursor misplacement.
The method of displaying the remote cursor has been changed, and cursor
movements on the VNC server are now accurately reflected on the VNC client.
(BZ#1100661)
All tigervnc users are advised to upgrade to these updated packages, which
correct these issues and add these enhancements.
4. Solution:
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258
5. Bugs fixed (https://bugzilla.redhat.com/):
1072733 - vnc black screen and error 'XRequest.130: BadValue (integer parameter out of range for operation) 0x400'
1119640 - VNC-EXTENSION missed on Xorg server regeneration
1151307 - CVE-2014-8240 tigervnc: integer overflow flaw, leading to a heap-based buffer overflow in screen size handling
1151312 - CVE-2014-8241 tigervnc: NULL pointer dereference flaw in XRegion
1162722 - tigervnc-server has no IPV6 support
1181287 - gnome 3 session inside vncserver changes initial resolution instead of using what was specified from "-geometry
1194898 - Rebuild tigervnc against rebased xserver in 7.2
1195266 - The display number is not required in the file name for VNC
1199437 - Enable Xinerama extension
1199453 - Re-base to tigervnc-1.3.x
6. Package List:
Red Hat Enterprise Linux Client (v. 7):
Source:
tigervnc-1.3.1-3.el7.src.rpm
noarch:
tigervnc-icons-1.3.1-3.el7.noarch.rpm
tigervnc-license-1.3.1-3.el7.noarch.rpm
x86_64:
tigervnc-1.3.1-3.el7.x86_64.rpm
tigervnc-debuginfo-1.3.1-3.el7.x86_64.rpm
tigervnc-server-1.3.1-3.el7.x86_64.rpm
tigervnc-server-minimal-1.3.1-3.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
noarch:
tigervnc-server-applet-1.3.1-3.el7.noarch.rpm
x86_64:
tigervnc-debuginfo-1.3.1-3.el7.x86_64.rpm
tigervnc-server-module-1.3.1-3.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source:
tigervnc-1.3.1-3.el7.src.rpm
noarch:
tigervnc-license-1.3.1-3.el7.noarch.rpm
x86_64:
tigervnc-debuginfo-1.3.1-3.el7.x86_64.rpm
tigervnc-server-minimal-1.3.1-3.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
noarch:
tigervnc-icons-1.3.1-3.el7.noarch.rpm
tigervnc-server-applet-1.3.1-3.el7.noarch.rpm
x86_64:
tigervnc-1.3.1-3.el7.x86_64.rpm
tigervnc-debuginfo-1.3.1-3.el7.x86_64.rpm
tigervnc-server-1.3.1-3.el7.x86_64.rpm
tigervnc-server-module-1.3.1-3.el7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source:
tigervnc-1.3.1-3.el7.src.rpm
aarch64:
tigervnc-1.3.1-3.el7.aarch64.rpm
tigervnc-debuginfo-1.3.1-3.el7.aarch64.rpm
tigervnc-server-1.3.1-3.el7.aarch64.rpm
tigervnc-server-minimal-1.3.1-3.el7.aarch64.rpm
noarch:
tigervnc-icons-1.3.1-3.el7.noarch.rpm
tigervnc-license-1.3.1-3.el7.noarch.rpm
ppc64:
tigervnc-1.3.1-3.el7.ppc64.rpm
tigervnc-debuginfo-1.3.1-3.el7.ppc64.rpm
tigervnc-server-1.3.1-3.el7.ppc64.rpm
tigervnc-server-minimal-1.3.1-3.el7.ppc64.rpm
ppc64le:
tigervnc-1.3.1-3.el7.ppc64le.rpm
tigervnc-debuginfo-1.3.1-3.el7.ppc64le.rpm
tigervnc-server-1.3.1-3.el7.ppc64le.rpm
tigervnc-server-minimal-1.3.1-3.el7.ppc64le.rpm
s390x:
tigervnc-1.3.1-3.el7.s390x.rpm
tigervnc-debuginfo-1.3.1-3.el7.s390x.rpm
tigervnc-server-1.3.1-3.el7.s390x.rpm
tigervnc-server-minimal-1.3.1-3.el7.s390x.rpm
x86_64:
tigervnc-1.3.1-3.el7.x86_64.rpm
tigervnc-debuginfo-1.3.1-3.el7.x86_64.rpm
tigervnc-server-1.3.1-3.el7.x86_64.rpm
tigervnc-server-minimal-1.3.1-3.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 7):
aarch64:
tigervnc-debuginfo-1.3.1-3.el7.aarch64.rpm
tigervnc-server-module-1.3.1-3.el7.aarch64.rpm
noarch:
tigervnc-server-applet-1.3.1-3.el7.noarch.rpm
ppc64:
tigervnc-debuginfo-1.3.1-3.el7.ppc64.rpm
tigervnc-server-module-1.3.1-3.el7.ppc64.rpm
ppc64le:
tigervnc-debuginfo-1.3.1-3.el7.ppc64le.rpm
tigervnc-server-module-1.3.1-3.el7.ppc64le.rpm
x86_64:
tigervnc-debuginfo-1.3.1-3.el7.x86_64.rpm
tigervnc-server-module-1.3.1-3.el7.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 7):
Source:
tigervnc-1.3.1-3.el7.src.rpm
noarch:
tigervnc-icons-1.3.1-3.el7.noarch.rpm
tigervnc-license-1.3.1-3.el7.noarch.rpm
x86_64:
tigervnc-1.3.1-3.el7.x86_64.rpm
tigervnc-debuginfo-1.3.1-3.el7.x86_64.rpm
tigervnc-server-1.3.1-3.el7.x86_64.rpm
tigervnc-server-minimal-1.3.1-3.el7.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 7):
noarch:
tigervnc-server-applet-1.3.1-3.el7.noarch.rpm
x86_64:
tigervnc-debuginfo-1.3.1-3.el7.x86_64.rpm
tigervnc-server-module-1.3.1-3.el7.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-2014-8240
https://access.redhat.com/security/cve/CVE-2014-8241
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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