Throughout November, I plan to release details on vulnerabilities I found in web-browsers which I've not released before. This is the sixteenth entry in that series. Unfortunately I won't be able to publish everything within one month at the current rate, so I may continue to publish these through December and January. The below information is available in more detail on my blog at http://blog.skylined.nl/20161122001.html. There you can find a repro that triggered this issue in addition to the information below. Follow me on http://twitter.com/berendjanwever for daily browser bugs. MSIE 8 MSHTML SRunPointer::SpanQualifier/RunType OOB read ========================================================= (MS15-009, CVE-2015-0050) Synopsis -------- A specially crafted web-page can cause Microsoft Internet Explorer 8 to attempt to read data beyond the boundaries of a memory allocation. The issue does not appear to be easily exploitable. Known affected software, attack vectors and mitigations ------------------------------------------------------- * Microsoft Internet Explorer 8 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. Description ----------- The issue requires rather complex manipulation of the DOM and results in reading a value immediately following an object. The lower three bits of this value are returned by the function doing the reading, resulting in a return value in the range 0-7. After exhaustively skipping over the read AV and having that function return each value, no other side effects were noticed. For that reason I assume this issue is hard if not impossible to exploit and did not investigate further. It is still possible that there may be subtle effects that I did not notice that allow exploitation in some form or other. Time-line --------- * *June 2014*: This vulnerability was found through fuzzing. * *October 2014*: This vulnerability was submitted to ZDI. * *October 2014*: This vulnerability was rejected by ZDI. * *November 2014*: This vulnerability was reported to MSRC. * *February 2015*: This vulnerability was addressed by Microsoft in MS15-009. * *November 2016*: Details of this issue are released. Cheers, SkyLined
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