TippingPoint Zero Day Initiative
 

(0Day) WebGate eDVR Manager WESPPTZ.WESPPTZCtrl.1 Connect/ConnectEx Heap Buffer Overflow Remote Code Execution Vulnerability

ZDI-15-061: February 27th, 2015

CVE ID

CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 13536. For further product information on the TippingPoint IPS:

Vulnerability Details


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of WebGate eDVR Manager. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the WESPPTZ.WESPPTZCtrl.1 control. The Connect and ConnectEx methods copy arbitrary data to a fixed-size heap buffer. This would allow an attacker to execute arbitrary code in the context of the browser.

Vendor Response

WebGate states:


This vulnerability is being disclosed publicly without a patch in accordance with the ZDI 120 day deadline.

02/10/2014 - ZDI sent email to vendor requesting contact for disclosure
02/18/2014 - ZDI sent email to vendor requesting contact for disclosure
03/07/2014 - ZDI requested ICS-CERT assistance contacting the vendor
03/08/2014 - ZDI disclosed this case to ICS-CERT
05/12/2014 - ICS-CERT replied "We do not consider the WebGate eDVR Manager to be an element of control systems or of critical infrastructure, so we have forwarded these reports on to our friends at CERT/CC."
ZDI has since sent multiple mails to ICS-CERT, CERT/CC and kn-cert@ncsc.go.kr regarding Webgate cases in general. However, to ZDI's knowledge, this has not resulted in any vendor response.

-- Mitigation:
The killbit can be set on this control to disable scripting within Internet Explorer by modifying the data value of the Compatibility Flags DWORD within the following location in the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\359742AF-BF34-4379-A084-B7BF0E5F34B0
If the Compatibility Flags value is set to 0x00000400, the control can no longer be instantiated inside the browser.
For more information, please see: http://support.microsoft.com/kb/240797


Disclosure Timeline

    2014-02-10 - Case submitted to the ZDI
    2015-02-27 - Public release of advisory

Credit

This vulnerability was discovered by:
    rgod