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Red Hat Security Advisory 2017-0630-01

Red Hat Security Advisory 2017-0630-01
Posted Mar 21, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-0630-01 - Virtual Network Computing 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: 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.

tags | advisory, remote, denial of service
systems | linux, redhat
advisories | CVE-2016-10207, CVE-2017-5581
MD5 | b86ac5654b7713790a8d9c0eb6a21a01

Red Hat Security Advisory 2017-0630-01

Change Mirror Download

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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
=====================================================================

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

Copyright 2017 Red Hat, Inc.
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