CVE-2013-3242 : Detail

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.

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.

------------------------------------------------------------------ Joomla! <= 3.0.3 (remember.php) PHP Object Injection Vulnerability ------------------------------------------------------------------ [-] Software Link: http://www.joomla.org/ [-] Affected Versions: Version 3.0.3 and earlier 3.0.x versions. Version 2.5.9 and earlier 2.5.x versions. [-] Vulnerability Description: The vulnerable code is located in /plugins/system/remember/remember.php: 34. $hash = JApplication::getHash('JLOGIN_REMEMBER'); 35. 36. if ($str = JRequest::getString($hash, '', 'cookie', JREQUEST_ALLOWRAW | JREQUEST_NOTRIM)) 37. { 38. // Create the encryption key, apply extra hardening using the user agent string. 39. // Since we're decoding, no UA validity check is required. 40. $privateKey = JApplication::getHash(@$_SERVER['HTTP_USER_AGENT']); 41. 42. $key = new JCryptKey('simple', $privateKey, $privateKey); 43. $crypt = new JCrypt(new JCryptCipherSimple, $key); 44. $str = $crypt->decrypt($str); 45. $cookieData = @unserialize($str); User input passed through cookies is not properly sanitized before being used in an unserialize() call at line 45. This could be exploited to inject arbitrary PHP objects into the application scope. Successful exploitation of this vulnerability requires authentication because the attacker needs to know the "hash string" used to read the cookie parameter at line 36. [-] Solution: Upgrade to version 2.5.10, 3.0.4 or 3.1.0. [-] Disclosure Timeline: [04/12/2012] - Vendor alerted for a possible vulnerability [13/02/2013] - Vulnerability confirmed and proof of concept sent to the vendor [24/04/2013] - Vendor update released [26/04/2013] - Public disclosure [-] CVE Reference: The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2013-3242 to this vulnerability. [-] Credits: Vulnerability discovered by Egidio Romano. [-] Original Advisory: http://karmainsecurity.com/KIS-2013-04