Bug 702470 - (CVE-2011-1775) CVE-2011-1775 tigervnc: vncviewer can send password to server without proper validation of the X.509 certificate
CVE-2011-1775 tigervnc: vncviewer can send password to server without proper ...
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Security
Depends On: 702289 702672 702719
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Reported: 2011-05-05 14:21 EDT by Vincent Danen
Modified: 2015-07-31 08:41 EDT (History)
4 users (show)

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Doc Type: Bug Fix
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Last Closed: 2011-10-18 18:12:08 EDT
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Description Vincent Danen 2011-05-05 14:21:42 EDT
It was reported [1] that vncviewer could prompt for, and send, authentication credentials to a remote server without first properly validating the X.509 certificate.  This could allow a malicious server to obtain a client's credentials because the client does not indicate to the user that a certificate is bad or missing.

A proposed patch [2] is being discussed.

[1] http://www.mail-archive.com/tigervnc-devel@lists.sourceforge.net/msg01342.html
[2] http://www.mail-archive.com/tigervnc-devel@lists.sourceforge.net/msg01347.html
Comment 2 Vincent Danen 2011-05-06 10:33:26 EDT
This flaw does not affect older versions of tigervnc due to X.509 certificate handling being a new feature (new to the forthcoming 1.1.0):

Comment 3 Vincent Danen 2011-05-06 10:35:45 EDT
Created tigervnc tracking bugs for this issue

Affects: fedora-15 [bug 702672]
Comment 5 Vincent Danen 2011-05-09 18:54:56 EDT
This has been assigned the name CVE-2011-1775.
Comment 6 Kurt Seifried 2011-05-09 19:52:13 EDT
Confirmed Fedora 14 is not vulnerable, they ship 1.0.90 which is labeled "1.0.90 (1.1beta1)" on tigervnc download sit, but the 1.0.90 they ship is older (svn4123) and does not have the X509 support.
Comment 7 errata-xmlrpc 2011-06-15 06:06:50 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

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

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