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ID

VAR-201708-1705


TITLE

(0Day) Advantech WebAccess TpMegaJVT Set_MD_Mode Heap-based Buffer Overflow Remote Code Execution Vulnerability

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sources: ZDI: ZDI-17-527

DESCRIPTION

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Advantech WebAccess. 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 TpMegaJVT.ocx. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute arbitrary code under the context of the process.

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sources: ZDI: ZDI-17-527

AFFECTED PRODUCTS

vendor:advantechmodel:webaccessscope: - version: -

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sources: ZDI: ZDI-17-527

CVSS

SEVERITY

CVSSV2

CVSSV3

ZDI: ZDI-17-527
value: HIGH

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ZDI: ZDI-17-527
severity: HIGH
baseScore: 7.5
vectorString: AV:N/AC:L/AU:N/C:P/I:P/A:P
accessVector: NETWORK
accessComplexity: LOW
authentication: NONE
confidentialityImpact: PARTIAL
integrityImpact: PARTIAL
availabilityImpact: PARTIAL
exploitabilityScore: 10.0
impactScore: 6.4
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

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sources: ZDI: ZDI-17-527

PATCH

title:This vulnerability is being disclosed publicly without a patch in accordance with the ZDI 120 day deadline.11/08/2016, 11/09/2016, 11/10/2016 and 11/15/2016 - ZDI disclosed the reports, 44 in all, to ICS-CERT11/09/2016 - The vendor acknowledged receipt of the report through ICS-CERT and ICS-CERT provided ICS-VU-71410304/27/2017 - ICS-CERT notified ZDI these might be fixed in the latest version and asked would ZDI re-test05/03/2017 - ZDI replied that we cannot do the testing for AdvantechICS-CERT did not respond06/23/2017 - ZDI wrote to ICS-CERT requesting any available update07/31/2017 - ZDI wrote to ICS-CERT requesting any available update08/01/2017 - ZDI wrote to ICS-CERT advising of the intent to 0-day-- 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\BF28239A-3823-40FF-BC02-2DA4D9DBB1EEIf the Compatibility Flags value is set to 0x00000400, the control can no longer be instantiated inside the browser.For more information, please see: url:http://support.microsoft.com/kb/240797

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sources: ZDI: ZDI-17-527

EXTERNAL IDS

db:ZDI_CANid:ZDI-CAN-4091

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db:ZDIid:ZDI-17-527

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sources: ZDI: ZDI-17-527

REFERENCES

url:http://support.microsoft.com/kb/240797

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sources: ZDI: ZDI-17-527

CREDITS

Anonymous

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sources: ZDI: ZDI-17-527

SOURCES

db:ZDIid:ZDI-17-527

LAST UPDATE DATE

2022-05-17T01:50:56.703000+00:00


SOURCES UPDATE DATE

db:ZDIid:ZDI-17-527date:2017-08-07T00:00:00

SOURCES RELEASE DATE

db:ZDIid:ZDI-17-527date:2017-08-07T00:00:00