Message-ID: <OFEAD532AF.FC0F3BEE-ON8825735D.0055E341-8825735D.005BD883@3com.com>
Date: Fri, 21 Sep 2007 09:43:12 -0700
From: zdi-disclosures@...m.com
To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	vulnwatch@...nwatch.org, vulndiscuss@...nwatch.org
Subject: ZDI-07-053: Microsoft ISA Server SOCKS4 Proxy
	Connection Leakage

ZDI-07-053: Microsoft ISA Server SOCKS4 Proxy Connection Leakage
http://www.zerodayinitiative.com/advisories/ZDI-07-053.html
September 20, 2007

-- CVE ID:
CVE-2007-4991

-- Affected Vendor:
Microsoft

-- Affected Products:
ISA Server 2004 SP1
ISA Server 2004 SP2

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability since September 20, 2007 by Digital Vaccine protection
filter ID 4085. For further product information on the TippingPoint IPS:

    http://www.tippingpoint.com 

-- Vulnerability Details:
This vulnerability allows remote attackers to extract IP addresses
visited through the SOCKS4 Proxy on vulnerable ISA Server
installations. Authentication is not required to exploit this
vulnerability.

This specific flaw exists when an empty packet is sent to the SOCKS4.
The server will return a packet containing the last IP address it
proxied to.

-- Vendor Response:
Microsoft has issued an update to correct this vulnerability. More
details can be found at:

http://www.microsoft.com/downloads/details.aspx?FamilyID=A05A074A-5033-4792-AF8B-58B90D841436&displaylang=en

-- Disclosure Timeline:
2006.01.30 - Vulnerability reported to vendor
2007.09.20 - Digital Vaccine released to TippingPoint customers
2007.09.20 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by CIRT.DK.

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, a division of 3Com, The Zero Day Initiative
(ZDI) represents a best-of-breed model for rewarding security
researchers for responsibly disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

    http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is used.
3Com does not re-sell the vulnerability details or any exploit code.
Instead, upon notifying the affected product vendor, 3Com provides its
customers with zero day protection through its intrusion prevention
technology. Explicit details regarding the specifics of the
vulnerability are not exposed to any parties until an official vendor
patch is publicly available. Furthermore, with the altruistic aim of
helping to secure a broader user base, 3Com provides this vulnerability
information confidentially to security vendors (including competitors)
who have a vulnerability protection or mitigation product.


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