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Message-Id: <20151222171213.8E8206C046C@smtpvmsrv1.mitre.org>
Date: Tue, 22 Dec 2015 12:12:13 -0500 (EST)
From: cve-assign@...re.org
To: emmanuel.law@...il.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com, security@....net
Subject: Re: CVE Request: Use after free in PHP Collator::sortWithSortKeys function
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> I reported a use after free in PHP's Intl extension. The vulnerability
> is in Collator::sortWithSortKeys function. Only Php 7.0.0 is affected.
>
> This can potentially be remotely exploitable if the sorting function
> is called on a user supplied array.
>
> https://bugs.php.net/bug.php?id=71020
>> - Array is destroyed via zval_ptr_dtor( array );
>> - sortKeyIndxBuf[0....0xba].zstr are now dangling pointers
>> - New array initialized (Hashtable with initial element size of 8)
>> - As the dangling pointers are added to array, the size of the Hashtable grows.
>> - As the Hashtable grows, it's allocated more memory via zend_hash_do_resize()
>> - It will then be allocated memory that co-incides with an address
>> pointed to by the dangling pointer sortKeyIndxBuf[j].zstr. Thus
>> sortKeyIndxBuf[j].zstr now no longer points to a valid zval.
>> - ... it will access dereference whatever is the value within this "corrupted zval"
>> [2015-12-07 19:04 UTC] ab@....net
>> Yeah, we should have kept this till short before the release, as usually done
>> for security patches.
Use CVE-2015-8616.
Also, while we're doing CVEs for PHP 7.0.1, this one is CVE-2015-8617:
https://bugs.php.net/bug.php?id=71105
http://php.net/ChangeLog-7.php
https://github.com/php/php-src/commit/b101a6bbd4f2181c360bd38e7683df4a03cba83e
[2015-12-13 02:48 UTC] laruence@....net ... this is a security fix
A format string vulnerability exists in PHP-7.0.0 due to how
non-existent class names are handled. ... Adding a "%s" as the
second parameter there seems to fix the issue.
If anyone is familiar with "Fixed double free in error condition of
format printer" in that changelog and wants a CVE ID, please let us
know.
- --
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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