Executive Summary

Summary
Title tigervnc security update
Informations
Name RHSA-2011:0871 First vendor Publication 2011-06-15
Vendor RedHat Last vendor Modification 2011-06-15
Severity (Vendor) Moderate Revision 01

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:P/I:P/A:N)
Cvss Base Score 5.8 Attack Range Network
Cvss Impact Score 4.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Problem Description:

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

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2011-0871.html

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-20 Improper Input Validation

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:21963
 
Oval ID: oval:org.mitre.oval:def:21963
Title: RHSA-2011:0871: tigervnc security update (Moderate)
Description: The CSecurityTLS::processMsg function in common/rfb/CSecurityTLS.cxx in the vncviewer component in TigerVNC 1.1beta1 does not properly verify the server's X.509 certificate, which allows man-in-the-middle attackers to spoof a TLS VNC server via an arbitrary certificate.
Family: unix Class: patch
Reference(s): RHSA-2011:0871-01
CVE-2011-1775
 Version: 4
Platform(s): Red Hat Enterprise Linux 6
 Product(s): tigervnc
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:23428
 
Oval ID: oval:org.mitre.oval:def:23428
Title: ELSA-2011:0871: tigervnc security update (Moderate)
Description: The CSecurityTLS::processMsg function in common/rfb/CSecurityTLS.cxx in the vncviewer component in TigerVNC 1.1beta1 does not properly verify the server's X.509 certificate, which allows man-in-the-middle attackers to spoof a TLS VNC server via an arbitrary certificate.
Family: unix Class: patch
Reference(s): ELSA-2011:0871-01
CVE-2011-1775
 Version: 6
Platform(s): Oracle Linux 6
 Product(s): tigervnc
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:28102
 
Oval ID: oval:org.mitre.oval:def:28102
Title: DEPRECATED: ELSA-2011-0871 -- tigervnc security update (moderate)
Description: [1.0.90-0.15.20110314svn4359.1] - viewer can send password without proper validation of X.509 certs (CVE-2011-1775)
Family: unix Class: patch
Reference(s): ELSA-2011-0871
CVE-2011-1775
 Version: 4
Platform(s): Oracle Linux 6
 Product(s): tigervnc
Definition Synopsis:

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1

OpenVAS Exploits

Date Description
2012-06-06 Name : RedHat Update for tigervnc RHSA-2011:0871-01
File : nvt/gb_RHSA-2011_0871-01_tigervnc.nasl
2011-06-13 Name : TigerVNC SSL Certificate Validation Security Bypass Vulnerability (Windows)
File : nvt/gb_tigervnc_ssl_sec_bypass_vuln_win.nasl

Open Source Vulnerability Database (OSVDB)

Id Description
73119 TigerVNC CSecurityTLS::processMsg Function common/rfb/CSecurityTLS.cxx X.509 ...

Nessus® Vulnerability Scanner

Date Description
2013-07-12 Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2011-0871.nasl - Type : ACT_GATHER_INFO
2012-08-01 Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20110615_tigervnc_on_SL6_x.nasl - Type : ACT_GATHER_INFO
2011-06-16 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2011-0871.nasl - Type : ACT_GATHER_INFO
2011-05-25 Name : The remote Fedora host is missing a security update.
File : fedora_2011-6838.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2014-02-17 11:54:48
  • Multiple Updates