#38710 [NEW]: data leakage because of nonexisting boundary checking in statements

From: domas at mysql dot com Operating system: Any PHP version: 5.1.6 PHP Bug Type: MySQLi related Bug description: data leakage because of nonexisting boundary checking in statements Description: ------------ If function is executed in a prepared statement (like CONCAT, UNCOMPRESS, etc), it allocates 8192-sized buffer, but fetch() doesn't check actual length of data. If data crosses 8192-byte boundary, all sorts of weird stuff starts to happen, including possible sensitive data disclosures of non-overwrited buffers (at smaller lengths) or process crashes (at bigger ones). Reproduce code: --------------- $db=new mysqli("localhost","root","","test"); $qry=$db->stmt_init(); $qry->prepare("SELECT REPEAT('a',100000)"); $qry->execute(); $qry->bind_result($text); $qry->fetch(); Expected result: ---------------- silence Actual result: -------------- crash! -- Edit bug report at http://bugs.php.net/?id=38710&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=38710&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=38710&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=38710&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=38710&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=38710&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=38710&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=38710&r=needscript Try newer version: http://bugs.php.net/fix.php?id=38710&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=38710&r=support Expected behavior: http://bugs.php.net/fix.php?id=38710&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=38710&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=38710&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=38710&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=38710&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=38710&r=dst IIS Stability: http://bugs.php.net/fix.php?id=38710&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=38710&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=38710&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=38710&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=38710&r=mysqlcfg