SurfControl Web Filter for Microsoft ISA Server Vulnerability

Package: SurfControl Web Filter for Microsoft ISA

Vendor Web Site: http://www.surfcontrol.com

Version: 4.2.0.21

Platforms: Windows 2000 Server

Local: No

Remote: Yes

Fix Available: No (recommended steps listed below)

Vendor Contacted: Sunday, June 08, 2003

Advisory Author: Thomas Adams (tgadams (at) bellsouth (dot) net [email concealed])

Background:

SurfControl Web Filter is a url filtering system, designed to be easily

deployed onto most networks. SurfControl for Microsoft ISA is a plugin

the allows the Microsoft ISA server to have more control over the

internet usage. The plugin still allows most of the same benefits from

the stand alone product including: customizable reporting, easy admin

interface, and the remote interface for report retrieval.

Exploit:

An attacker is able to view/download any file from the server using a

directory traversal attack:

http://isa-surfserver:8888/.../.../.../.../winnt/

Vendor Response:

SurfControl team was notified concerning the above vulnerability.

SurfControl had previous knowledge that this existed on the stand alone

SurfControl platforms, but did not know it existed on the plugin for

Microsoft ISA. They recommended disabling the reports server and said it

is turned on by default for "convenience to users." Convenience before

security from a leader in filter products?

To disable the report server, go to Admin Tools> Services> and stop

SurfControl Web Filter Report Server

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