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TITLE:
Excel Viewer OCX ActiveX Control Buffer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA25077

VERIFY ADVISORY:
http://secunia.com/advisories/25077/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Excel Viewer OCX 3.x
http://secunia.com/product/14112/

DESCRIPTION:
shinnai has discovered some vulnerabilities in Excel Viewer OCX,
which can be exploited by malicious people to compromise a user's
system.

The vulnerabilities are caused due to boundary errors within the
Excel Viewer ActiveX control (ExcelViewer.ocx). These can be
exploited to cause stack-based buffer overflows via overly long
arguments passed to certain methods (e.g. "HttpDownloadFile()" or
"OpenWebFile()").

Successful exploitation may allow execution of arbitrary code when a
user visits a malicious website.

The vulnerabilities are confirmed in version 3.2.0.5. Other versions
may also be affected.

SOLUTION:
Set the kill-bit for the affected ActiveX control.

PROVIDED AND/OR DISCOVERED BY:
shinnai

ORIGINAL ADVISORY:
http://moaxb.blogspot.com/2007/05/moaxb-02-excelviewerocx-v-31-multiple.html

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