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Packet Storm Advisory 2013-0903-1 - Apple Safari Heap Buffer Overflow

Packet Storm Advisory 2013-0903-1 - Apple Safari Heap Buffer Overflow
Posted Sep 4, 2013
Authored by Vitaliy Toropov | Site packetstormsecurity.com

A 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. This finding was purchased through the Packet Storm Bug Bounty program.

tags | advisory, overflow, arbitrary, javascript, code execution, bug bounty, packet storm
systems | apple, osx, iphone, ios
advisories | CVE-2012-3748
SHA-256 | 84bd76ba4dce1e485a3431a2c7bbd07c262e86f184ca05e0931fac224f9ab746

Packet Storm Advisory 2013-0903-1 - Apple Safari Heap Buffer Overflow

Change Mirror Download
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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@packetstormsecurity.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@packetstormsecurity.com or visit the bug bounty page at:

http://packetstormsecurity.com/bugbounty/


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