Public Vulnerability Reports

Adobe Shockwave Player Memory Corruption Vulnerability

08.24.10

BACKGROUND

Adobe Shockwave Player is a popular Web browser plugin. It is available for multiple Web browsers and platforms, including Windows, and MacOS. Shockwave Player enables Web browsers to display rich multimedia content in the form of Shockwave videos. For more information, see the vendor's site found at the following link:

http://get.adobe.com/shockwave

DESCRIPTION

Remote exploitation of a memory corruption vulnerability in Adobe Systems Inc.'s Shockwave Player could allow an attacker to execute arbitrary code with the privileges of the current user.

The vulnerability takes place during the processing of a tSAC chunk within an Adobe Director file. A length value is read from the tSAC chunk and a signed comparison is made against the length value. If the length value is negative, a memory address is incorrectly calculated and a null byte is written to the memory address. This condition may lead to arbitrary code execution.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the user viewing the Web page. To exploit this vulnerability, a targeted user must load a malicious Adobe Director file created by an attacker. An attacker typically accomplishes this via social engineering or injecting content into a compromised, trusted site.

DETECTION

Shockwave Player 11.5.7.609 and earlier versions for Windows and Macintosh are vulnerable.

WORKAROUND

The killbit for the Shockwave Player ActiveX control can be set by creating the following registry key: HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{233C1507-6A77-46A4-9443-F871F945D258}

Under this key create a new DWORD value called "Compatibility Flags" and set its hexadecimal value to 400.

To re-enable Shockwave Player set the "Compatibility Flags" value to 0.

VENDOR RESPONSE

Adobe has released a fix which addresses this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown.

http://get.adobe.com/shockwave/

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2010-2875 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

07/07/2010 Initial Vendor Notification
07/07/2010 Initial Vendor Reply
08/24/2010 Coordinated Public Disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2010 Verisign, Inc.

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