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[KIS-2013-10] openSIS <= 5.2 (ajax.php) PHP Code Injection Vulnerability
From: Egidio Romano <research () karmainsecurity com>
Date: Thu, 05 Dec 2013 20:34:59 +0100

----------------------------------------------------------
openSIS <= 5.2 (ajax.php) PHP Code Injection Vulnerability
----------------------------------------------------------


[-] Software Link:

http://www.opensis.com/


[-] Affected Versions:

All versions from 4.5 to 5.2.


[-] Vulnerability Description:

The vulnerable code is located in the /ajax.php script:

86.     if(clean_param($_REQUEST['modname'],PARAM_NOTAGS))
87.     {
88.             if($_REQUEST['_openSIS_PDF']=='true')
89.                     ob_start();
90.             if(strpos($_REQUEST['modname'],'?')!==false)
91.             {
92. $vars = substr($_REQUEST['modname'],(strpos($_REQUEST['modname'],'?')+1)); 93. $modname = substr($_REQUEST['modname'],0,strpos($_REQUEST['modname'],'?'));
94.
95.                     $vars = explode('?',$vars);
96.                     foreach($vars as $code)
97.                     {
98. $code = decode_unicode_url("\$_REQUEST['".str_replace('=',"']='",$code)."';");
99.                             eval($code);
100.                    }
101.            }

User input passed through the "modname" request variable is not properly sanitized before being used in a call to the eval() function at line 99. This can be exploited to inject and execute arbitrary PHP code.


[-] Solution:

As of December 5th, 2013 the only solution is this patch: http://sourceforge.net/p/opensis-ce/code/1009


[-] Disclosure Timeline:

[04/12/2012] - Issue reported to http://sourceforge.net/p/opensis-ce/bugs/59/
[28/12/2012] - Vendor contacted, replied that the next version will fix the issue
[12/01/2013] - CVE number requested
[14/01/2013] - CVE number assigned
[26/04/2013] - Version 5.2 released, however the issue isn't fixed yet
[12/05/2013] - Vendor contacted again
[15/05/2013] - Issue temporarily fixed in the SVN repository (r1009)
[04/12/2013] - After one year still no official solution available


[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2013-1349 to this vulnerability.


[-] Credits:

Vulnerability discovered by Egidio Romano.


[-] Original Advisory:

http://karmainsecurity.com/KIS-2013-10



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  • [KIS-2013-10] openSIS <= 5.2 (ajax.php) PHP Code Injection Vulnerability Egidio Romano (Dec 09)
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