Bug #69274 [NEW]: preg_match function can be bypass with array type value

From: codexb at gmail dot com Operating system: All PHP version: 5.6.7 Package: *General Issues Bug Type: Bug Bug description:preg_match function can be bypass with array type value Description: ------------ 1. test environment : windows php 5.6.7 2. technical detail preg_match function compare regular espression and input of user. but if input value is array it fail to compare. As a result following script continuously execute. Attacker can bypass preg_macth function and take place side effect of various case. Test script: --------------- this is poc of vulnerability. http://192.168.0.2/test.php?input[]=abc'def <? $a = $_GET['input']; if(preg_match("~[^0-9a-z+\\.]~",$a,$match)) { // special char check echo "you can't execute following script"; exit; } system("touch filename"); echo "why i am here"; ?> Expected result: ---------------- "why i am here" print -- Edit bug report at https://bugs.php.net/bug.php?id=69274&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=69274&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=69274&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=69274&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=69274&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=69274&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=69274&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=69274&r=needscript Try newer version: https://bugs.php.net/fix.php?id=69274&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=69274&r=support Expected behavior: https://bugs.php.net/fix.php?id=69274&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=69274&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=69274&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=69274&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=69274&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=69274&r=dst IIS Stability: https://bugs.php.net/fix.php?id=69274&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=69274&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=69274&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=69274&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=69274&r=mysqlcfg