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TITLE:
Office Viewer ActiveX Control Buffer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA25143

VERIFY ADVISORY:
http://secunia.com/advisories/25143/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Office Viewer OCX 3.x
http://secunia.com/product/14132/

DESCRIPTION:
shinnai has discovered some vulnerabilities in Office 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
Office Viewer ActiveX control (OA.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-04-office-viewer-oaocx-v-32.html

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