27 September 2007
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0731 -- [Win] Microsoft ISA Server SOCKS4 Proxy Connection Leakage 27 September 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft ISA Server 2004 Publisher: TippingPoint Operating System: Windows Server 2003 Windows 2000 Impact: Read-only Data Access Access: Remote/Unauthenticated CVE Names: CVE-2007-4991 Original Bulletin: http://www.zerodayinitiative.com/advisories/ZDI-07-053.html - --------------------------BEGIN INCLUDED TEXT-------------------- 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 firstname.lastname@example.org. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to email@example.com and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: firstname.lastname@example.org Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBRvsIWCh9+71yA2DNAQLH8QP/QHWhyz4jr1mHO1VyPU0X/Xeb2ofPc1ST ojQphYqblGL7gLBQHpFPY42cdvyZ8VPOA2V7/flWTW2ZkMRkzw5GshMX7J22uwef TmVEKlO151rU72sAVJJJxf6XVuLp91f2I2I6BTGKZI1+C8YLIHqINcuXKdmRnAy0 oLELR6r0A/g= =Gp5M -----END PGP SIGNATURE-----