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Category:   Device (Router/Bridge/Hub)  >   Blue Coat ProxySG Vendors:   Blue Coat Systems
Blue Coat ProxySG Policy Error May Let Remote Users Bypass Default CONNECT Policy Rules
SecurityTracker Alert ID:  1015644
SecurityTracker URL:  http://securitytracker.com/id/1015644
CVE Reference:   CVE-2006-0578   (Links to External Site)
Date:  Feb 17 2006
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): SGOS 4.1.2.1
Description:   A vulnerability was reported in Blue Coat Proxy Security Gateway OS. A remote user may be able to bypass connection filters.

When the 'Deep Content Inspection' function is invoked via a connection inspection rule in a policy, the ProxySG will no longer enforce the implicit CONNECT blocking rule to block all connect attempts except those on the HTTPS port. As a result, CONNECT requests are permitted when they should otherwise be blocked.

SGOS versions 2.x, 3.x, and 4.2 are not affected.

Dominique Gregoire reported this vulnerability.

The original advisory is available at:

http://www.secumind.net/content/french/modules/news/article.php?storyid=8

Impact:   A remote user can bypass connection policy filters when deep inspection is used.
Solution:   The vendor plans to issue a fixed version (4.1.4).

The vendor has provided the following workaround for ProxySG [quoted]:

Place the following policy rule in the beginning of every VPM Web Access layer or CPL Proxy layer that contains an ALLOW, DENY or EXCEPTION action:

http.method=CONNECT url.port=!443 DENY

Adding this in a layer by itself will not workaround the issue, it must be added to the beginning of every Web Access or <Proxy> layer.

Vendor URL:  www.bluecoat.com/support/knowledge/advisory_connect_denial_ignore.html (Links to External Site)
Cause:   Access control error

Message History:   None.


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