Synopsis
Moderate: tigervnc security, bug fix, and enhancement update
Type/Severity
Security Advisory: Moderate
Topic
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.
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.
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
Affected Products
-
Red Hat Enterprise Linux Server 7 x86_64
-
Red Hat Enterprise Linux Server - Extended Update Support 7.6 x86_64
-
Red Hat Enterprise Linux Server - Extended Update Support 7.5 x86_64
-
Red Hat Enterprise Linux Server - Extended Update Support 7.4 x86_64
-
Red Hat Enterprise Linux Server - Extended Update Support 7.3 x86_64
-
Red Hat Enterprise Linux Server - AUS 7.6 x86_64
-
Red Hat Enterprise Linux Workstation 7 x86_64
-
Red Hat Enterprise Linux Desktop 7 x86_64
-
Red Hat Enterprise Linux for IBM z Systems 7 s390x
-
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
-
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.5 s390x
-
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.4 s390x
-
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.3 s390x
-
Red Hat Enterprise Linux for Power, big endian 7 ppc64
-
Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
-
Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.5 ppc64
-
Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.4 ppc64
-
Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.3 ppc64
-
Red Hat Enterprise Linux for Scientific Computing 7 x86_64
-
Red Hat Enterprise Linux Server from RHUI 7 x86_64
-
Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
-
Red Hat Enterprise Linux EUS Compute Node 7.5 x86_64
-
Red Hat Enterprise Linux EUS Compute Node 7.4 x86_64
-
Red Hat Enterprise Linux EUS Compute Node 7.3 x86_64
-
Red Hat Enterprise Linux Server - AUS 7.4 x86_64
-
Red Hat Enterprise Linux Server - AUS 7.3 x86_64
-
Red Hat Enterprise Linux for Power, little endian 7 ppc64le
-
Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.6 ppc64le
-
Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.5 ppc64le
-
Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.4 ppc64le
-
Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.3 ppc64le
-
Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.2 ppc64le
-
Red Hat Enterprise Linux Server - TUS 7.6 x86_64
-
Red Hat Enterprise Linux Server - TUS 7.3 x86_64
-
Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.6 ppc64le
-
Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.4 ppc64le
-
Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.3 ppc64le
-
Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.6 x86_64
-
Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.4 x86_64
-
Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.3 x86_64
Fixes
- BZ - 1072733 - vnc black screen and error 'XRequest.130: BadValue (integer parameter out of range for operation) 0x400'
- BZ - 1119640 - VNC-EXTENSION missed on Xorg server regeneration
- BZ - 1151307 - CVE-2014-8240 tigervnc: integer overflow flaw, leading to a heap-based buffer overflow in screen size handling
- BZ - 1151312 - CVE-2014-8241 tigervnc: NULL pointer dereference flaw in XRegion
- BZ - 1162722 - tigervnc-server has no IPV6 support
- BZ - 1181287 - gnome 3 session inside vncserver changes initial resolution instead of using what was specified from "-geometry
- BZ - 1194898 - Rebuild tigervnc against rebased xserver in 7.2
- BZ - 1195266 - The display number is not required in the file name for VNC
- BZ - 1199437 - Enable Xinerama extension
- BZ - 1199453 - Re-base to tigervnc-1.3.x
CVEs
References
Vulmon