Microsoft Internet Security and Acceleration Server SOCKS4 Proxy Discloses IP Address Information to Remote Users
SecurityTracker Alert ID: 1018727|
SecurityTracker URL: http://securitytracker.com/id/1018727
(Links to External Site)
Date: Sep 21 2007
Disclosure of user information|
Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes |
Version(s): prior to 2004 SP3|
A vulnerability was reported in Microsoft Internet Security and Acceleration (ISA) Server. A remote user can determine IP address information.|
A remote user can send an empty packet to the SOCKS4 proxy to obtain the IP address of the most recent destination host that the proxy sent traffic to.
The vendor was notified on January 30, 2006.
CIRT.DK reported this vulnerability via TippingPoint.
A remote user can determine the IP address that the SOCKS4 proxy last sent data to.|
The vendor has issued a fix (2004 SP3).|
The Microsoft advisory is available at:
Vendor URL: www.microsoft.com/downloads/details.aspx?FamilyID=A05A074A-5033-4792-AF8B-58B90D841436&displaylang=en (Links to External Site)
Access control error|
Source Message Contents
Date: Fri, 21 Sep 2007 09:43:12 -0700|
Subject: [Full-disclosure] ZDI-07-053: Microsoft ISA Server SOCKS4 Proxy
ZDI-07-053: Microsoft ISA Server SOCKS4 Proxy Connection Leakage
September 20, 2007
-- CVE ID:
-- Affected Vendor:
-- 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:
-- 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
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
-- Vendor Response:
Microsoft has issued an update to correct this vulnerability. More
details can be found at:
-- 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
This vulnerability was discovered by CIRT.DK.
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