From: ircmaxell
Operating system: All
PHP version: master-Git-2012-06-28 (Git)
Package: Reproducible crash
Bug Type: Bug
Bug description:Crypt SHA256/512 Segfaults With Malformed Salt
Description:
------------
Crypt() SHA256 and SHA512 segfault when passed a salt that contains a null
byte.
This is because the emalloc call and the memset call use different length
inputs
for the `output` string. The memset call then overflows the buffer.
Test script:
---------------
<?php
crypt("foo", '$5$'.chr(0).'abc');
?>
and
<?php
crypt("foo", '$6$'.chr(0).'abc');
?>
Expected result:
----------------
No output
Actual result:
--------------
Either segmentation fault (sha512) or zend_mm_heap corrupted (sha256)
--
Edit bug report at https://bugs.php.net/bug.php?id=62443&edit=1
--
Try a snapshot (PHP 5.4):
https://bugs.php.net/fix.php?id=62443&r=trysnapshot54
Try a snapshot (PHP 5.3):
https://bugs.php.net/fix.php?id=62443&r=trysnapshot53
Try a snapshot (trunk):
https://bugs.php.net/fix.php?id=62443&r=trysnapshottrunk
Fixed in SVN:
https://bugs.php.net/fix.php?id=62443&r=fixed
Fixed in SVN and need be documented:
https://bugs.php.net/fix.php?id=62443&r=needdocs
Fixed in release:
https://bugs.php.net/fix.php?id=62443&r=alreadyfixed
Need backtrace:
https://bugs.php.net/fix.php?id=62443&r=needtrace
Need Reproduce Script:
https://bugs.php.net/fix.php?id=62443&r=needscript
Try newer version:
https://bugs.php.net/fix.php?id=62443&r=oldversion
Not developer issue:
https://bugs.php.net/fix.php?id=62443&r=support
Expected behavior:
https://bugs.php.net/fix.php?id=62443&r=notwrong
Not enough info:
https://bugs.php.net/fix.php?id=62443&r=notenoughinfo
Submitted twice:
https://bugs.php.net/fix.php?id=62443&r=submittedtwice
register_globals:
https://bugs.php.net/fix.php?id=62443&r=globals
PHP 4 support discontinued:
https://bugs.php.net/fix.php?id=62443&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=62443&r=dst
IIS Stability:
https://bugs.php.net/fix.php?id=62443&r=isapi
Install GNU Sed:
https://bugs.php.net/fix.php?id=62443&r=gnused
Floating point limitations:
https://bugs.php.net/fix.php?id=62443&r=float
No Zend Extensions:
https://bugs.php.net/fix.php?id=62443&r=nozend
MySQL Configuration Error:
https://bugs.php.net/fix.php?id=62443&r=mysqlcfg
