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Red Hat Security Advisory 2011-0871-01

Red Hat Security Advisory 2011-0871-01
Posted Jun 15, 2011
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2011-0871-01 - Virtual Network Computing is a remote display system which allows you to view a computer's 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. It was discovered that vncviewer could prompt for and send authentication credentials to a remote server without first properly validating the server's X.509 certificate. As vncviewer did not indicate that the certificate was bad or missing, a man-in-the-middle attacker could use this flaw to trick a vncviewer client into connecting to a spoofed VNC server, allowing the attacker to obtain the client's credentials. Various other issues were also addressed.

tags | advisory, remote, spoof
systems | linux, redhat
advisories | CVE-2011-1775
MD5 | f77cf8dd5565693cb489cb6a4968a492

Red Hat Security Advisory 2011-0871-01

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=====================================================================
Red Hat Security Advisory

Synopsis: Moderate: tigervnc security update
Advisory ID: RHSA-2011:0871-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-0871.html
Issue date: 2011-06-15
CVE Names: CVE-2011-1775
=====================================================================

1. Summary:

Updated tigervnc packages that fix one security issue are now available for
Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link 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 you
to view a computer's 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.

It was discovered that vncviewer could prompt for and send authentication
credentials to a remote server without first properly validating the
server's X.509 certificate. As vncviewer did not indicate that the
certificate was bad or missing, a man-in-the-middle attacker could use this
flaw to trick a vncviewer client into connecting to a spoofed VNC server,
allowing the attacker to obtain the client's credentials. (CVE-2011-1775)

All tigervnc users should upgrade to these updated packages, which contain
a backported patch to correct this issue.

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/kb/docs/DOC-11259

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

702470 - CVE-2011-1775 tigervnc: vncviewer can send password to server without proper validation of the X.509 certificate

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.src.rpm

i386:
tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm
tigervnc-server-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm

x86_64:
tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-server-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.src.rpm

i386:
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm
tigervnc-server-module-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm

noarch:
tigervnc-server-applet-1.0.90-0.15.20110314svn4359.el6_1.1.noarch.rpm

x86_64:
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-server-module-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.src.rpm

noarch:
tigervnc-server-applet-1.0.90-0.15.20110314svn4359.el6_1.1.noarch.rpm

x86_64:
tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-server-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-server-module-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.src.rpm

i386:
tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm
tigervnc-server-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm

ppc64:
tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.ppc64.rpm
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.ppc64.rpm
tigervnc-server-1.0.90-0.15.20110314svn4359.el6_1.1.ppc64.rpm

s390x:
tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.s390x.rpm
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.s390x.rpm
tigervnc-server-1.0.90-0.15.20110314svn4359.el6_1.1.s390x.rpm

x86_64:
tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-server-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.src.rpm

i386:
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm
tigervnc-server-module-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm

noarch:
tigervnc-server-applet-1.0.90-0.15.20110314svn4359.el6_1.1.noarch.rpm

ppc64:
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.ppc64.rpm
tigervnc-server-module-1.0.90-0.15.20110314svn4359.el6_1.1.ppc64.rpm

x86_64:
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-server-module-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.src.rpm

i386:
tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm
tigervnc-server-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm

x86_64:
tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-server-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1.src.rpm

i386:
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm
tigervnc-server-module-1.0.90-0.15.20110314svn4359.el6_1.1.i686.rpm

noarch:
tigervnc-server-applet-1.0.90-0.15.20110314svn4359.el6_1.1.noarch.rpm

x86_64:
tigervnc-debuginfo-1.0.90-0.15.20110314svn4359.el6_1.1.x86_64.rpm
tigervnc-server-module-1.0.90-0.15.20110314svn4359.el6_1.1.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/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-1775.html
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 2011 Red Hat, Inc.
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