TippingPoint Zero Day Initiative

WebEx Downloader Plug-in Code Execution Vulnerability

ZDI-06-021: July 6th, 2006

CVE ID

Affected Vendors

    WebEx Communications Inc.

Affected Products

Vulnerability Details

This vulnerability allows attackers to execute arbitrary code on vulnerable installations of the WebEx Downloader Plug-in. Successful exploitation requires that the target user browse to a malicious web page.

The specific flaws exists due to the lack of input validation on various ActiveX/Java control parameters and configuration directives. The "GpcUrlRoot" and "GpcIniFileName" ActiveX/Java control parameters allow an attacker to specify the location of a configuration file containing further control directives. This allows an attacker to transfer arbitrary files and executables to the target. The attacker can then leverage available configuration directives to execute the newly created executables thereby compromising the underlying system.

Vendor Response

WebEx Communications Inc. has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2006-04-11 - Vulnerability reported to vendor
    2006-07-06 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:
    Anonymous