ZDI-10-079: Realnetworks Helix Server NTLM Authentication Invalid Base64 Remote Code Execution Vulnerability

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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

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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.

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    http://www.zerodayinitiative.com/advisories/disclosure_policy/

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