Advisory Details

February 27th, 2015

(0Day) WebGate WebEyeAudio.OCX Stack Buffer Overflow Remote Code Execution Vulnerability

ZDI-15-054
ZDI-CAN-2092

CVE ID CVE-2015-2093
CVSS SCORE 7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P
AFFECTED VENDORS WebGate
AFFECTED PRODUCTS Web Camera Server Audio
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID ['13452']. 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 the WebGate WebEyeAudio ActiveX control. 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 Connect method provided by the control. By providing a malicious value, an attacker is able to overflow a static buffer on the stack, and could execute arbitrary code in the context of the browser.
ADDITIONAL DETAILS


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

12/20/2013 - ZDI disclosed this case to ICS-CERT
12/23/2013 - ICS-CERT replied with a ticket number and a message that "We have sent your report to our partners at CERT/CC because the WebGate Web Camera is not an industial control system product. CERT/CC will coordinate with the affected vendor and update you as progress is made."
05/30/2014 - ZDI notified ICS-CERT, CERT/CC that the case would reach 180-days on 06/18/14
06/16/2014 - ZDI re-notified ICS-CERT, CERT/CC of 180-day deadline
07/18/2014 - ICS-CERT copied ZDI on re-ping of CERT/CC
08/06/2014 - ICS-CERT notified ZDI that CERT/CC sent the case to Korea's CERT
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\317AC6BB-6E8E-11D4-9BF0-005004BBFC86
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
  • 2013-12-20 - Vulnerability reported to vendor
  • 2015-02-27 - Coordinated public release of advisory
CREDIT Anonymous
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