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:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	atkac, kseifried, kurt, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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):

http://tigervnc.svn.sourceforge.net/viewvc/tigervnc?view=revision&revision=4200

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