Bug #68690 [NEW]: Off-by-one out-of-bounds write

From: bugreports at internot dot info Operating system: Linux Ubuntu 14.04 PHP version: master-Git-2014-12-30 (Git) Package: mbstring related Bug Type: Bug Bug description:Off-by-one out-of-bounds write Description: ------------ Hi, In /ext/mbstring/libmbfl/filters/mbfilter_sjis_2004.c: 508 if ((filter->status & 0xf) == 1 && 509 filter->cache >= 0 && filter->cache <= jisx0213_u2_tbl_len) { This implies that filter->cache can be between (inclusive) 0-25. Then: 514 c1 = jisx0213_u2_tbl[2*k]; If k is 25, it will evaluate to 50. It also may occur here: 519 if (c == jisx0213_u2_tbl[2*k+1]) { Thanks, -- Edit bug report at https://bugs.php.net/bug.php?id=68690&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=68690&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=68690&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=68690&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=68690&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=68690&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=68690&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=68690&r=needscript Try newer version: https://bugs.php.net/fix.php?id=68690&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=68690&r=support Expected behavior: https://bugs.php.net/fix.php?id=68690&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=68690&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=68690&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=68690&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=68690&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=68690&r=dst IIS Stability: https://bugs.php.net/fix.php?id=68690&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=68690&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=68690&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=68690&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=68690&r=mysqlcfg