Title: Microsoft Windows Terminal Services Remote Security Restriction Bypass Vulnerability
Severity: MODERATE
Description:
Microsoft Windows Terminal Services is prone to a remote security-restriction bypass vulnerability because the server software fails to properly enforce encryption requirements.
This issue arises when RDP clients running version 6.0 of the software are configured to always connect, even when authentication fails. When they connect to servers that require encrypted communications, the initial connection will fail, and they will fall back to an unencrypted communications channel.
The client's window banner will not show a padlock after it has fallen back to an unencrypted connection.
This issue was discovered with a server using a self-signed SSL certificate. Valid certificates from trusted certificate authorities have not been tested.
Users can connect to affected servers; no encryption is required. Attackers can thus bypass security requirements configured by administrators and perform man-in-the-middle attacks or eavesdrop on RDP sessions.
This issue affects Terminal Services installed on Windows 2003 Server; other versions may also be affected.
Affected Products:
- Microsoft Windows Server 2003 Terminal Services
References:
- Microsoft: Microsoft Server 2003 Terminal Services Page
Juniper Networks provides this content via a wide variety of sources and production methods. If notified of errors or omissions in the content of this page, Juniper Networks, at its discretion, will modify or remove the page or leave the content as is, depending on various factors including but not limited to the reputation and authority of the party providing the notification. Please use the contact information displayed elsewhere on this page to report any errors or omissions regarding the content on this page.
