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Category:   Device (Router/Bridge/Hub)  >   Blue Coat ProxySG Vendors:   Blue Coat Systems
Blue Coat ProxySG Discloses NTLM Hashes to Remote Users
SecurityTracker Alert ID:  1032149
SecurityTracker URL:
CVE Reference:   CVE-2015-4334   (Links to External Site)
Updated:  Dec 8 2015
Original Entry Date:  Apr 17 2015
Impact:   Disclosure of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 5.x, 6.x prior to
Description:   A vulnerability was reported in Blue Coat ProxySG. A remote user can obtain authentication information on the target system.

A remote user can send an HTTP 407 authentication challenge request to obtain the NTLM hashes for ProxySG users. The hashes can then be used to obtain the Active Directory passwords of the proxy users.

Systems configured for explicit proxy are affected.

Jonas Vestberg at Sentor Managed Security Services AB reported this vulnerability.

Impact:   A remote user can obtain NTLM hashes for users on the target system.
Solution:   The vendor has issued a fix (

A fix is not available for version 6.2.

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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