[KIS-2013-10] openSIS <= 5.2 (ajax.php) PHP Code Injection Vulnerability

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