ZDI-12-094 : RealNetworks Helix Server rn5auth Credential Parsing Remote Code Execution Vulnerability

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ZDI-12-094 : RealNetworks Helix Server rn5auth Credential Parsing Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-094
June 21, 2012

• – CVE ID:
  CVE-2012-0942

• – CVSS:
  7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

• – 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 12401.
  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 Real Helix Server. Authentication is not
  required to exploit this vulnerability.

The specific flaw exists within rn4auth.dll, which is responsible for
parsing authentication credentials. When the GetNameValuePair() function
calls strcpy, there is an unbounded copy into a stack buffer, which can
lead to stack memory corruption. An attacker can leverage this
vulnerability to execute code under the context of the process.

• – Vendor Response:

RealNetworks has issued an update to correct this vulnerability. More
details can be found at:

http://helixproducts.real.com/docs/security/SecurityUpdate04022012HS.pdf

• – Disclosure Timeline:
  2011-11-04 - Vulnerability reported to vendor

2012-06-21 - Coordinated public release of advisory

• – Credit:
  This vulnerability was discovered by:

• Anonymous

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