Advisory Details

September 20th, 2007

Microsoft ISA Server SOCKS4 Proxy Connection Leakage Vulnerability

CVE ID	CVE-2007-4991
CVSS SCORE
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	ISA Server
TREND MICRO CUSTOMER PROTECTION	Trend Micro TippingPoint IPS customers are protected against this vulnerability 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.
ADDITIONAL DETAILS	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 - Coordinated public release of advisory
CREDIT	CIRT.DK

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