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 integer overflow 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 when handling CString objects embedded in a PowerPoint presentation file. An issue in this object results in a very small amount of buffer being allocated while a very large amount of data is copied into it. This leads to an exploitable heap-based buffer overflow.
Exploitation allows an attacker to execute arbitrary code in the context of a user opening a malicious presentation using Microsoft PowerPoint Viewer 2003. In order to exploit this vulnerability, an attacker must persuade, or otherwise force, a targeted user to open such a document. This could be accomplished using a direct URL, an e-mail, an instant message, or even by hijacking a trusted site.
iDefense has confirmed that pptview.exe file version 11.0.5703.0 and file version 11.0.6566.0, as included in Microsoft Office 2003 SP2, are vulnerable. Other versions are also likely to be affected.
Version 11.0.8164.0 of pptview.exe, as included in Microsoft Office 2003 SP3, does not appear to be 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-2008-0120 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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