Microsoft Corp.'s PowerPoint Viewer is a viewer for full-featured presentations created in PowerPoint 97 and later versions. PowerPoint Viewer 2003 is freely downloadable from Microsoft's website at the following URL.
Remote exploitation of an out of boundary array index vulnerability in Microsoft Corp.'s PowerPoint Viewer 2003 could allow an attacker to execute arbitrary code in the context of the user running the application.
This vulnerability specifically exists in PowerPoint Viewer 2003 when handling certain records in a PowerPoint presentation file. In some circumstances, an array index can be directly controlled by data from within the PowerPoint presentation file. Thus, a function pointer can be directly controlled by the attacker and leveraged for arbitrary code execution.
Exploitation allows an attacker to execute arbitrary code on the affected host in the context of the user who opened a malicious PPT presentation using Microsoft PowerPoint Viewer 2003.
Exploitation of this vulnerability would require an attacker to either host a malicious PowerPoint presentation file and use social engineering techniques to trick a user into visiting the site or to deliver the hostile code to a user via e-mail, for example. The user would then need to view the file using Microsoft's PowerPoint Viewer.
iDefense has confirmed that pptview.exe file version 11.0.5703.0 is vulnerable. Previous versions are also likely to be affected.
pptview.exe file version 11.0.6566.0, as included in Microsoft Office 2003 SP2, and version 11.0.8164.0, as included in Microsoft Office 2003 SP3 appear to be not affected.
iDefense is currently unaware of any effective workaround for this issue.
Microsoft has officially addressed this vulnerability with Security Bulletin MS08-051. For more information, consult their bulletin at the following URL.
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-0121 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.
09/28/2007 Initial vendor notification
09/28/2007 Initial vendor response
08/12/2008 Coordinated public disclosure
This vulnerability was reported to iDefense by Ruben Santamarta from Reversemode.com.
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