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Category:   Application (Generic)  >   Red Hat Virtual Desktop Server Manager Vendors:   Red Hat
Red Hat Virtual Desktop Server Manager (VDSM) SSL Connection Handling Flaw Lets Remote Users Deny Service
SecurityTracker Alert ID:  1024347
SecurityTracker URL:
CVE Reference:   CVE-2010-2811   (Links to External Site)
Date:  Aug 20 2010
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Red Hat Virtual Desktop Server Manager (VDSM). A remote user can cause denial of service conditions.

A remote user can send specially crafted SSL data to prevent the target VDSM from accepting SSL connections from other users.

Impact:   A remote user can prevent the target VDSM from accepting SSL connections from other users.
Solution:   The vendor has issued a fix.

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5.5

Message History:   None.

 Source Message Contents

Subject:  [RHSA-2010:0628-01] Moderate: vdsm22 security and bug fix update

Hash: SHA1

                   Red Hat Security Advisory

Synopsis:          Moderate: vdsm22 security and bug fix update
Advisory ID:       RHSA-2010:0628-01
Product:           Red Hat Enterprise Virtualization
Advisory URL:
Issue date:        2010-08-19
CVE Names:         CVE-2010-2811 

1. Summary:

Updated vdsm22 packages that fix one security issue and multiple bugs are
now available for Red Hat Enterprise Linux 5.5.

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:

RHEV Agents (VDSM) - x86_64

3. Description:

VDSM is a management module that serves as a Red Hat Enterprise
Virtualization Manager agent on Red Hat Enterprise Virtualization
Hypervisor or Red Hat Enterprise Linux hosts.

Note: This update has been tested and is supported on Red Hat Enterprise
Linux 5.5 (with all appropriate post-GA 5.5-specific updates).

A flaw was found in the way VDSM accepted SSL connections. An attacker
could trigger this flaw by creating a crafted SSL connection to VDSM,
preventing VDSM from accepting SSL connections from other users.

These updated vdsm22 packages also fix the following bugs:

* suspend-to-file hibernation failed for huge guests due to the migration
and hibernation constant values being too short for huge guests. This
update makes the timeouts proportional to guest RAM size, thus allowing
suspension of huge guests in all cases except where storage is unbearably
slow. (BZ#601275)

* under certain circumstances, restarting a VDSM that was being used as a
Storage Pool Manager killed all system processes on the host. With this
update, stopping VDSM is ensured to kill only the processes that it
started, and the VDSM SIGTERM handler is not run concurrently. With these
changes, all processes on the host are no longer killed when VDSM is
restarted. (BZ#614849)

* when VDSM was requested to "start in paused mode", it incorrectly
reported virtual guest state as "WaitForLaunch" instead of "Paused", which
led to the virtual guest being inaccessible from Red Hat Enterprise
Virtualization Manager. With this update, VDSM reports such virtual guests
as "Paused", and users are able to connect to the virtual guest display.

Red Hat Enterprise Virtualization Manager 2.2 users with Red Hat Enterprise
Linux hosts should install these updated packages, which resolve these
issues. Alternatively, Red Hat Enterprise Virtualization Manager can
install the new package automatically.

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

5. Bugs fixed (

622928 - CVE-2010-2811 vdsm: SSL accept() blocks on a non-blocking Connection

6. Package List:

RHEV Agents (VDSM):


These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from

7. References:

8. Contact:

The Red Hat security contact is <>.  More contact
details at

Copyright 2010 Red Hat, Inc.
Version: GnuPG v1.4.4 (GNU/Linux)


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