ZDI-11-308 : Cisco WebEx Player ATAS32.DLL linesProcessed Remote Code Execution Vulnerability

Type securityvulns
Reporter Securityvulns
Modified 2011-10-31T00:00:00


ZDI-11-308 : Cisco WebEx Player ATAS32.DLL linesProcessed Remote Code Execution Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-11-308 October 26, 2011

-- CVE ID: CVE-2011-4004

-- CVSS: 9, AV:N/AC:L/Au:N/C:P/I:P/A:C

-- Affected Vendors:


-- Affected Products:

Cisco WebEx

-- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Cisco WebEx Player. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists in ATAS32.DLL during the parsing of values defined within the WRF file format. The vulnerable code trusts the linesProcessed value from the file, and uses it in some logic to determine the destination pointer for a memcpy. By supplying an overly large linesProcessed value, the subtraction would cause an integer underflow and allows an attacker control of the destination buffer pointer. This can be further leveraged to execute arbitrary code under the context of the current user.

-- Vendor Response:

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


-- Disclosure Timeline: 2011-05-12 - Vulnerability reported to vendor 2011-10-26 - Coordinated public release of advisory

-- Credit: This vulnerability was discovered by:

  • Aniway (Aniway.Anyway@gmail.com)

  • 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:


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:


Follow the ZDI on Twitter: