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.

CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is being sent by 3Com for the sole use of the intended recipient(s) and may contain confidential, proprietary and/or privileged information. Any unauthorized review, use, disclosure and/or distribution by any recipient is prohibited. If you are not the intended recipient, please delete and/or destroy all copies of this message regardless of form and any included attachments and notify 3Com immediately by contacting the sender via reply e-mail or forwarding to 3Com at postmaster@3com.com. Received on Fri Sep 21 15:28:36 2007

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