Advisory Details

February 27th, 2015

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

ZDI-15-070
ZDI-CAN-2149

CVE ID CVE-2015-2095
CVSS SCORE 7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS WebGate
AFFECTED PRODUCTS eDVR Manager
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 13975. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
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 ActiveX control. The arguments to the SetConnectInfo() method can be used to overflow a statically allocated heap buffer. An attacker can use this 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
04/07/2014 - ZDI sent other product reports for this vendor to ICS-CERT
05/12/2014 - 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 Dave Weinstein of HP's Zero Day Initaitive
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