Bug #64170 [NEW]: ECHO with a character become a backdoor

From: yoco_smart at live dot cn Operating system: windows & linux PHP version: Irrelevant Package: *General Issues Bug Type: Bug Bug description:ECHO with a character become a backdoor Description: ------------ echo function become a backdoor. hello, i'm YoCo,from Silic Network Solutions Company,China. I find that some character can make the function ECHO become the backdoor, just one line!! like this: echo $_POST[x]; the quote character is `, not the '',it is diffrent between ' and ,is it right? i dont know why the `` will equal the function SYSTEM, i test it both on the windows with iis and linux with apache,both of them are work well, however the ECHO function become a hacker's backdoor, if some one use it, the manager hard to find it. Test script: --------------- <?php /* usage: test.php?x=dir */ echo $_GET[x]; ?> Expected result: ---------------- the ECHO function becomes the SYSTEM function, just one line script. -- Edit bug report at https://bugs.php.net/bug.php?id=64170&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=64170&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=64170&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=64170&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=64170&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=64170&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=64170&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=64170&r=needscript Try newer version: https://bugs.php.net/fix.php?id=64170&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=64170&r=support Expected behavior: https://bugs.php.net/fix.php?id=64170&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=64170&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=64170&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=64170&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=64170&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=64170&r=dst IIS Stability: https://bugs.php.net/fix.php?id=64170&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=64170&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=64170&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=64170&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=64170&r=mysqlcfg