[RHSA-2017:0630-01] Moderate: tigervnc security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Moderate: tigervnc security and bug fix update

Advisory ID: RHSA-2017:0630-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0630.html

Issue date: 2017-03-21

CVE Names: CVE-2016-10207 CVE-2017-5581

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1. Summary:

 

An update for tigervnc is now available for Red Hat Enterprise Linux 6.

 

Red Hat Product Security has rated this update as having a security impact

of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which

gives a detailed severity rating, is available for each vulnerability from

the CVE link(s) in the References section.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, noarch, x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch, x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - i386, noarch, ppc64, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, 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.

 

Security Fix(es):

 

* A denial of service flaw was found in the TigerVNC's Xvnc server. A

remote unauthenticated attacker could use this flaw to make Xvnc crash by

terminating the TLS handshake process early. (CVE-2016-10207)

 

* A buffer overflow flaw, leading to memory corruption, was found in

TigerVNC viewer. A remote malicious VNC server could use this flaw to crash

the client vncviewer process resulting in denial of service.

(CVE-2017-5581)

 

Additional Changes:

 

For detailed information on changes in this release, see the Red Hat

Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9

Technical Notes linked from the References section.

 

4. Solution:

 

For details on how to apply this update, which includes the changes

described in this advisory, refer to:

 

https://access.redhat.com/articles/11258

 

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

 

1323065 - tigervnc cannot build against xorg-x11-server-source

1378922 - tigervnc-server needs to be rebuilt to re-enable listen-on-tcp behavior in RHEL 6.8

1390458 - New version of tigervnc-server disconnects Xsession when initiated from xinetd

1415712 - CVE-2017-5581 tigervnc: Buffer overflow in ModifiablePixelBuffer::fillRect

1418761 - CVE-2016-10207 tigervnc: VNC server can crash when TLS handshake terminates early

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 6):

 

Source:

tigervnc-1.1.0-24.el6.src.rpm

 

i386:

tigervnc-1.1.0-24.el6.i686.rpm

tigervnc-debuginfo-1.1.0-24.el6.i686.rpm

tigervnc-server-1.1.0-24.el6.i686.rpm

 

x86_64:

tigervnc-1.1.0-24.el6.x86_64.rpm

tigervnc-debuginfo-1.1.0-24.el6.x86_64.rpm

tigervnc-server-1.1.0-24.el6.x86_64.rpm

 

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

 

i386:

tigervnc-debuginfo-1.1.0-24.el6.i686.rpm

tigervnc-server-module-1.1.0-24.el6.i686.rpm

 

noarch:

tigervnc-server-applet-1.1.0-24.el6.noarch.rpm

 

x86_64:

tigervnc-debuginfo-1.1.0-24.el6.x86_64.rpm

tigervnc-server-module-1.1.0-24.el6.x86_64.rpm

 

Red Hat Enterprise Linux HPC Node Optional (v. 6):

 

Source:

tigervnc-1.1.0-24.el6.src.rpm

 

noarch:

tigervnc-server-applet-1.1.0-24.el6.noarch.rpm

 

x86_64:

tigervnc-1.1.0-24.el6.x86_64.rpm

tigervnc-debuginfo-1.1.0-24.el6.x86_64.rpm

tigervnc-server-1.1.0-24.el6.x86_64.rpm

tigervnc-server-module-1.1.0-24.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 6):

 

Source:

tigervnc-1.1.0-24.el6.src.rpm

 

i386:

tigervnc-1.1.0-24.el6.i686.rpm

tigervnc-debuginfo-1.1.0-24.el6.i686.rpm

tigervnc-server-1.1.0-24.el6.i686.rpm

 

ppc64:

tigervnc-1.1.0-24.el6.ppc64.rpm

tigervnc-debuginfo-1.1.0-24.el6.ppc64.rpm

tigervnc-server-1.1.0-24.el6.ppc64.rpm

 

s390x:

tigervnc-1.1.0-24.el6.s390x.rpm

tigervnc-debuginfo-1.1.0-24.el6.s390x.rpm

tigervnc-server-1.1.0-24.el6.s390x.rpm

 

x86_64:

tigervnc-1.1.0-24.el6.x86_64.rpm

tigervnc-debuginfo-1.1.0-24.el6.x86_64.rpm

tigervnc-server-1.1.0-24.el6.x86_64.rpm

 

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

 

i386:

tigervnc-debuginfo-1.1.0-24.el6.i686.rpm

tigervnc-server-module-1.1.0-24.el6.i686.rpm

 

noarch:

tigervnc-server-applet-1.1.0-24.el6.noarch.rpm

 

ppc64:

tigervnc-debuginfo-1.1.0-24.el6.ppc64.rpm

tigervnc-server-module-1.1.0-24.el6.ppc64.rpm

 

x86_64:

tigervnc-debuginfo-1.1.0-24.el6.x86_64.rpm

tigervnc-server-module-1.1.0-24.el6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 6):

 

Source:

tigervnc-1.1.0-24.el6.src.rpm

 

i386:

tigervnc-1.1.0-24.el6.i686.rpm

tigervnc-debuginfo-1.1.0-24.el6.i686.rpm

tigervnc-server-1.1.0-24.el6.i686.rpm

 

x86_64:

tigervnc-1.1.0-24.el6.x86_64.rpm

tigervnc-debuginfo-1.1.0-24.el6.x86_64.rpm

tigervnc-server-1.1.0-24.el6.x86_64.rpm

 

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

 

i386:

tigervnc-debuginfo-1.1.0-24.el6.i686.rpm

tigervnc-server-module-1.1.0-24.el6.i686.rpm

 

noarch:

tigervnc-server-applet-1.1.0-24.el6.noarch.rpm

 

x86_64:

tigervnc-debuginfo-1.1.0-24.el6.x86_64.rpm

tigervnc-server-module-1.1.0-24.el6.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-2016-10207

https://access.redhat.com/security/cve/CVE-2017-5581

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

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Release_Notes/index.html

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Technical_Notes/index.html

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2017 Red Hat, Inc.

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