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Microsoft Internet Explorer 11 MSHTML CSpliceTreeEngine::RemoveSplice Use-After-Free

Microsoft Internet Explorer 11 MSHTML CSpliceTreeEngine::RemoveSplice Use-After-Free
Posted Dec 21, 2016
Authored by SkyLined

Microsoft Internet Explorer 11 suffers from an MSHTML CSpliceTreeEngine::RemoveSplice use-after-free vulnerability.

tags | advisory
advisories | CVE-2014-1785
SHA-256 | 4a433ee19642c052fc88dcbd2f3aa14e1198530dc3d8a39879f995d3b05cac16

Microsoft Internet Explorer 11 MSHTML CSpliceTreeEngine::RemoveSplice Use-After-Free

Change Mirror Download
Since November I have been releasing details on all vulnerabilities I
found that I have not released before. This is the 36th entry in the
series. This information is available in more detail on my blog at
http://blog.skylined.nl/20161220001.html. There you can find a repro
that triggered this issue in addition to the information below, as well
as a Proof-of-Concept exploit that attempts to prove exploitability.

If you find these releases useful, and would like to help me make time
to continue releasing this kind of information, you can make a donation
in bitcoin to 183yyxa9s1s1f7JBpAPHPmzAQ346y91Rx5DX.

Follow me on http://twitter.com/berendjanwever for daily browser bugs.

MSIE 11 MSHTML CSpliceTreeEngine::RemoveSplice use-after-free
=============================================================
(MS14-035, CVE-2014-1785)

Synopsis
--------
A specially crafted web-page can trigger a use-after-free vulnerability
in Microsoft Internet Explorer 11. There is sufficient time between the
free and reuse for an attacker to control the contents of the freed
memory and exploit the vulnerability.

Known affected software, attack vectors and potential mitigations
-----------------------------------------------------------------
* Microsoft Internet Explorer 11

An attacker would need to get a target user to open a specially
crafted web-page. Disabling JavaScript should prevent an attacker
from triggering the vulnerable code path.

Details
-------
This was one of the first bugs where I attempted to do a proper
analysis, and I got some feedback from ZDI that explained what I got
right and what I got wrong. Basically, on x86, a 0x28 byte memory block
is allocated in `MSHTML!CMarkup::DoEmbedPointers` and when you execute
`document.execCommand("Delete")`. This memory can be freed when you
execute `document.open()` in a `DOMNodeRemoved` event handler. After
that, you can use Javascript to reallocate the memory before it is reused.

Time-line
---------
* 30 December 2013: This vulnerability was submitted to ZDI.
* 8 January 2014: This vulnerability was acquired by ZDI.
* 14 January 2014: This vulnerability was disclosed to Microsoft by ZDI.
* 10 June 2014: This vulnerability was address by Microsoft in MS14-035.
* 20 December 2016: Details of this vulnerability are released.

Cheers,

SkyLined

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