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Sec Bug #68960 Bundled PCRE affected by CVE-2014-8964
Submitted: 2015-01-30 10:22 UTC Modified: 2015-03-20 05:50 UTC
From: thoger at redhat dot com Assigned: remi (profile)
Status: Closed Package: PCRE related
PHP Version: 5.6.5 OS:
Private report: No CVE-ID: None
 [2015-01-30 10:22 UTC] thoger at redhat dot com
Description:
------------
A heap buffer overflow related to handling of zero-repeat assertions was reported and fixed upstream:

http://bugs.exim.org/show_bug.cgi?id=1546
http://www.exim.org/viewvc/pcre?view=revision&revision=1513

Fix is expected to be included in the next PCRE upstream release.

Test script:
---------------
php -r 'preg_match("/(?(?=)*)/", "");'

Actual result:
--------------
Crash/SEGV on invalid memory read.

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 [2015-01-30 10:40 UTC] remi@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: remi
 [2015-01-30 10:40 UTC] remi@php.net
Thank you for taking the time to report a problem with PHP.
Unfortunately you are not using a current version of PHP -- 
the problem might already be fixed. Please download a new
PHP version from http://www.php.net/downloads.php

If you are able to reproduce the bug with one of the latest
versions of PHP, please change the PHP version on this bug report
to the version you tested and change the status back to "Open".
Again, thank you for your continued support of PHP.


 [2015-01-30 12:54 UTC] thoger at redhat dot com
Sorry, recent versions indeed no longer crash.  The fix resolves crash for 5.5, but it does not seem to make a difference for 5.6 (i.e. 5.6.3 does not crash even though it does not have the fix).  In the latest versions in all branches (5.6.5, 5.5.21, and 5.4.37), valgrind still detects invalid read.  I haven't investigated if test can be adjusted to bypass the linked fix, only wanted to make you aware of a public CVE for one of the bundled libraries.
 
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