full-disclosure - [PSA-2013-0903-1] Apple Safari Heap Buffer Overflow

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Message-ID: <20130904040258.GA6939@packetstormsecurity.org>
Date: Wed, 4 Sep 2013 04:02:59 +0000
From: fulldis@...ketstormsecurity.org
To: full-disclosure@...ts.grok.org.uk
Subject: [PSA-2013-0903-1] Apple Safari Heap Buffer
	Overflow

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+------------------------------------------------------------------------------+
| Packet Storm Advisory 2013-0903-1                                            |
| http://packetstormsecurity.com/                                              |
+------------------------------------------------------------------------------+
| Title: Apple Safari Heap Buffer Overflow                                     |
+--------------------+---------------------------------------------------------+
| Release Date       | 2013/09/03                                              |
| Advisory Contact   | Packet Storm (advisories@...ketstormsecurity.com)       |
| Researcher         | Vitaliy Toropov                                         |
+--------------------+---------------------------------------------------------+
| System Affected    | Apple Safari                                            |
| Versions Affected  | 6.0.1 for iOS 6.0 and OS X 10.7/8, possibly earlier     |
| Related Advisory   | APPLE-SA-2012-11-01-2                                   |
| Related CVE Number | CVE-2012-3748                                           |
| Vendor Patched     | 2012/11/01                                              |
| Classification     | 1-day                                                   |
+--------------------+---------------------------------------------------------+

+----------+
| OVERVIEW |
+----------+

The release of this advisory provides exploitation details in relation to a 
known patched vulnerability in Apple Safari.   These details were obtained 
through the Packet Storm Bug Bounty program and are being released to the 
community.

+------------------------------------------------------------------------------+

+---------+
| DETAILS |
+---------+

The heap memory buffer overflow vulnerability exists within the WebKit's 
JavaScriptCore JSArray::sort(...) method.  This method accepts the user-defined 
JavaScript function and calls it from the native code to compare array items. 
If this compare function reduces array length, then the trailing array items 
will be written outside the "m_storage->m_vector[]" buffer, which leads to the 
heap memory corruption.

The exploit for this vulnerability is a JavaScript code which shows how to 
use it for memory corruption of internal JS objects (Unit32Array and etc.) 
and subsequent arbitrary code execution (custom ARM/x64 payloads can be pasted 
into the JS code).

+------------------------------------------------------------------------------+

+------------------+
| PROOF OF CONCEPT |
+------------------+

The full exploit code is available here:
http://packetstormsecurity.com/files/123088/

+------------------------------------------------------------------------------+

+---------------+
| RELATED LINKS |
+---------------+

http://lists.apple.com/archives/security-announce/2012/Nov/msg00001.html
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-3748

+------------------------------------------------------------------------------+

+----------------+
| SHAMELESS PLUG |
+----------------+

The Packet Storm Bug Bounty program gives researchers the ability to profit 
from their discoveries.  You can get paid thousands of dollars for one day 
and zero day exploits.  Get involved by contacting us at 
getpaid@...ketstormsecurity.com or visit the bug bounty page at: 

http://packetstormsecurity.com/bugbounty/

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