module
MS13-055 Microsoft Internet Explorer CAnchorElement Use-After-Free
| Disclosed | Created |
|---|---|
| 2013-07-09 | 2018-05-30 |
Disclosed
2013-07-09
Created
2018-05-30
Description
In IE8 standards mode, it's possible to cause a use-after-free condition by first
creating an illogical table tree, where a CPhraseElement comes after CTableRow,
with the final node being a sub table element. When the CPhraseElement's outer
content is reset by using either outerText or outerHTML through an event handler,
this triggers a free of its child element (in this case, a CAnchorElement, but
some other objects apply too), but a reference is still kept in function
SRunPointer::SpanQualifier. This function will then pass on the invalid reference
to the next functions, eventually used in mshtml!CElement::Doc when it's trying to
make a call to the object's SecurityContext virtual function at offset +0x70, which
results a crash. An attacker can take advantage of this by first creating an
CAnchorElement object, let it free, and then replace the freed memory with another
fake object. Successfully doing so may allow arbitrary code execution under the
context of the user.
This bug is specific to Internet Explorer 8 only. It was originally discovered by
Jose Antonio Vazquez Gonzalez and reported to iDefense, but was discovered again
by Orange Tsai at Hitcon 2013.
creating an illogical table tree, where a CPhraseElement comes after CTableRow,
with the final node being a sub table element. When the CPhraseElement's outer
content is reset by using either outerText or outerHTML through an event handler,
this triggers a free of its child element (in this case, a CAnchorElement, but
some other objects apply too), but a reference is still kept in function
SRunPointer::SpanQualifier. This function will then pass on the invalid reference
to the next functions, eventually used in mshtml!CElement::Doc when it's trying to
make a call to the object's SecurityContext virtual function at offset +0x70, which
results a crash. An attacker can take advantage of this by first creating an
CAnchorElement object, let it free, and then replace the freed memory with another
fake object. Successfully doing so may allow arbitrary code execution under the
context of the user.
This bug is specific to Internet Explorer 8 only. It was originally discovered by
Jose Antonio Vazquez Gonzalez and reported to iDefense, but was discovered again
by Orange Tsai at Hitcon 2013.
Authors
Jose Antonio Vazquez Gonzalez
Orange Tsai
Peter Vreugdenhil
sinn3r sinn3r@metasploit.com
Orange Tsai
Peter Vreugdenhil
sinn3r sinn3r@metasploit.com
Platform
Windows
References
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