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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgendes RedHat Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.
CVE-2011-1775 – Schwachstelle in VNC-Viewer
Durch eine Schwachstelle im vncviewer werden die Logindaten zur
Authentifikation, die der Nutzer eingegeben hat, an einen entfernten
Server geschickt, ohne dass das X.509 Zertifikat vom Server geprueft
wird. Dies erlaubt einem entfernten Angreifer, der die Kontrolle ueber
einen Server besitzt, durch die Verwendung eines ungueltigen Zertifikats
einen Man-in-the-Middle-Angriff durchzufuehren, um die Logindaten von
Nutzern zu erhalten.
Betroffen sind die folgenden Software Pakete und Plattformen:
Paket tigervnc
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
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.
Mit freundlichen Gruessen,
Timo Schulz
– —
Timo Schulz, M.Sc. (Incident Response Team)
DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-590
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstrasse 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski
Automatische Warnmeldungen: https://www.cert.dfn.de/autowarn
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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
details at https://access.redhat.com/security/team/contact/
Copyright 2011 Red Hat, Inc.
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