Bug 702470 (CVE-2011-1775)

Summary: CVE-2011-1775 tigervnc: vncviewer can send password to server without proper validation of the X.509 certificate
Product: [Other] Security Response Reporter: Vincent Danen <vdanen>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: atkac, kseifried, kurt, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-10-18 22:12:08 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 702289, 702672, 702719    
Bug Blocks:    

Description Vincent Danen 2011-05-05 18:21:42 UTC
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 14:33:26 UTC
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 14:35:45 UTC
Created tigervnc tracking bugs for this issue

Affects: fedora-15 [bug 702672]

Comment 5 Vincent Danen 2011-05-09 22:54:56 UTC
This has been assigned the name CVE-2011-1775.

Comment 6 Kurt Seifried 2011-05-09 23:52:13 UTC
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 10:06:50 UTC
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