Microsoft ISA Server SOCKS4 Proxy Connection Leakage VulnerabilityZDI-07-053: September 20th, 2007
TippingPoint™ IPS Customer ProtectionTippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 4085. For further product information on the TippingPoint IPS:
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 ResponseMicrosoft has issued an update to correct this vulnerability. More details can be found at:
2006-01-30 - Vulnerability reported to vendor
2007-09-20 - Coordinated public release of advisory
CreditThis vulnerability was discovered by: