Advisory Details

September 20th, 2007

Microsoft ISA Server SOCKS4 Proxy Connection Leakage Vulnerability

ZDI-07-053
ZDI-CAN-018

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
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