[SA20956] WebEx Downloader Plug-in Multiple Vulnerabilities

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TITLE:
WebEx Downloader Plug-in Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA20956

VERIFY ADVISORY:
http://secunia.com/advisories/20956/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
WebEx Downloader plug-in 2.x
http://secunia.com/product/10916/

DESCRIPTION:
Some vulnerabilities have been reported in WebEx Downloader plug-in,
which can be exploited by malicious people to compromise a user's
system.

1) An error exists in the ActiveX and Java versions of the WebEx
Downloader plug-in where the source of downloaded components is not
properly verified. This can be exploited to install malicious
components on a user's system.

Successful exploitation allows execution of arbitrary code, but
requires that the user e.g. is tricked into visiting a malicious web
site.

The vulnerability has been reported in version 2.0.0.7. Other
versions may also be affected.

2) Some unspecified boundary errors in an included ActiveX control
can be exploited to cause a buffer overflow.

Successful exploitation may allow execution of arbitrary code.

SOLUTION:
Apply update.
http://www.webex.com/go/downloadSP30

PROVIDED AND/OR DISCOVERED BY:
1) Discovered by an anonymous person and reported via ZDI.
1-2) David Dewey and Mark Dowd, ISS X-Force.

ORIGINAL ADVISORY:
WebEx Communications:
http://www.webex.com/lp/security/ActiveAdv.html?TrackID=123456

Zero Day Initiative:
http://www.zerodayinitiative.com/advisories/ZDI-06-021.html

ISS X-Force:
http://xforce.iss.net/xforce/alerts/id/226

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