Microsoft Internet Explorer 9 - CDoc::Execute­Script­Uri Use-After-Free (MS13-009)

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Synopsis

A specially crafted web-page can trigger a use-after-free vulnerability in Microsoft Internet Explorer 9. I did not investigate this vulnerability thoroughly, so I cannot speculate on the potential impact or exploitability.

Known affected software and attack vectors

Microsoft Internet Explorer 9

An attacker would need to get a target user to open a specially crafted web-page. Disabling Java­Script does not prevent an attacker from triggering the vulnerable code path.

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Description

This is the first security vulnerability I sold to ZDI after I quit my job at Google to live off security bug bounties. It appears I either did not analyze this issue (probably), or misplaced my analysis (probably not), as I cannot find any details in my archives, other than a repro and a HTML bug report (provided below) created by a predecessor to Bug­Id. From the information provided by ZDI in their advisory, and Microsoft in their bulletin, as well as the bug report, it seems to have been a use-after-free vulnerability. Unfortunately, that is all the analysis I can provide.

Time-line

June 2012: This vulnerability was found through fuzzing.
June 2012: This vulnerability was submitted to ZDI.
July 2012: This vulnerability was acquired by ZDI.
September 2012: This vulnerability was disclosed to Microsoft by ZDI.
February 2013: Microsoft addresses this vulnerability in MS13-009.
December 2016: Details of this vulnerability are released.
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