ZDI-10-079: Realnetworks Helix Server NTLM Authentication Invalid Base64 Remote Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-10-079 April 28, 2010 -- CVE ID: CVE-2010-1317 -- Affected Vendors: RealNetworks -- Affected Products: RealNetworks Helix Server -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability by Digital Vaccine protection filter ID 6378. For further product information on the TippingPoint IPS, visit: http://www.tippingpoint.com -- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of RealNetworks Helix Server. Authentication is not required to exploit this vulnerability. The specific flaw exists within the authentication provided by the administrative web interface and is only present if it is configured to use NTLM. The vulnerability can be triggered by specifying invalid Base64 string within the Authorization header. If the string is not proper Base64 the vulnerable function returns -1 which is not verified and is later used as a length to a string copy routine. -- Vendor Response: RealNetworks states: This issue has been addressed in v14: http://www.realnetworks.com/helix-support/security-updates.aspx -- Disclosure Timeline: 2009-07-14 - Vulnerability reported to vendor 2010-04-28 - Coordinated public release of advisory -- Credit: This vulnerability was discovered by: * Anonymous -- About the Zero Day Initiative (ZDI): Established by TippingPoint, 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. TippingPoint does not re-sell the vulnerability details or any exploit code. Instead, upon notifying the affected product vendor, TippingPoint 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, TippingPoint provides this vulnerability information confidentially to security vendors (including competitors) who have a vulnerability protection or mitigation product. Our vulnerability disclosure policy is available online at: http://www.zerodayinitiative.com/advisories/disclosure_policy/ Follow the ZDI on Twitter: http://twitter.com/thezdi
