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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Object.prototype.__proto__ getter still provides access to WindowProxy"
href="https://bugs.webkit.org/show_bug.cgi?id=159756">159756</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Object.prototype.__proto__ getter still provides access to WindowProxy
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>Product</th>
<td>WebKit
</td>
</tr>
<tr>
<th>Version</th>
<td>WebKit Nightly Build
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>OS</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>Normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P2
</td>
</tr>
<tr>
<th>Component</th>
<td>JavaScriptCore
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>erights@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Re <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED"
href="show_bug.cgi?id=141865">https://bugs.webkit.org/show_bug.cgi?id=141865</a> , the underlying problem remains. At <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED"
href="show_bug.cgi?id=141865#c11">https://bugs.webkit.org/show_bug.cgi?id=141865#c11</a> I write:
The more interesting case is:
<span class="quote">>>> (function(){'use strict'; var g = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__').get; return g();})();</span >
so that g is obtained from a local environment record rather than the global one. On this, FF Nightly 50.0a1 (2016-07-13) correctly throws
TypeError: get __proto__ method called on incompatible undefined
whereas Webkit Nightly 9.1.1 (11601.6.17, r203190) returns the WindowPrototype, which is just as dangerous as ever.
At <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED"
href="show_bug.cgi?id=141865#c9">https://bugs.webkit.org/show_bug.cgi?id=141865#c9</a> Brent asked me to open a new bug if this is still a problem. Hence this new bug.</pre>
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