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Red Hat: RHSA-2011:0871 Moderate: Tigervnc Man-In-The-Middle

red hat
Calendar Grey June 15, 2011
Dist Redhat Esm H88
Recent Red Hat announcement for tigervnc vulnerability patch, mitigating moderate threats of interception attacks.
Updated tigervnc packages that fix one security issue are now available for Red Hat Enterprise Linux 6

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

Summary

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.

Topics%20covered

Topics Covered

security advisory moderate remote access Red Hat Enterprise man-in-the-middle tigervnc

References

https://access.redhat.com/security/cve/CVE-2011-1775 https://access.redhat.com/security/updates/classification#moderate

Package List

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


Read the Full Advisory


Advisory ID: RHSA-2011:0871-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:0871.html
Issue date: 2011-06-15

Topic

Updated tigervnc packages that fix one security issue are now available forRed Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.

Topics%20covered

Topics Covered

security advisory moderate remote access Red Hat Enterprise man-in-the-middle tigervnc

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

Bugs Fixed

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

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