Date: Fri, 20 Jan 2017 11:55:01 -0300 From: Gustavo Grieco <gustavo.grieco@...il.com> To: oss-security@...ts.openwall.com Subject: Re: CVE-2016-9584: heap use-after-free on libical 2017-01-20 8:26 GMT-03:00 Raphael Hertzog <hertzog@...ian.org>: > Hello, Hello Raphael, I'm working with Agustín to report this issues (he is our student in fact), but he is on holidays now, so I will answer your questions. > > On Thu, 15 Dec 2016, Agustin Mista wrote: >> We found a heap use-after-free in a recent revision of libical ( >> f3688b444f820cecf51b1539b0856a392c0fdb0f), >> using a specially crafted ics file. This bugs looks particularly dangerous >> since it allows to read a big chunk of the heap memory. > > I see you reported multiple bugs on github's libical issues page: > https://github.com/libical/libical/issues/251 > https://github.com/libical/libical/issues/252 > https://github.com/libical/libical/issues/253 > > Looking at the backtrace, it seems that #253 is the same as this one. > Do you confirm? Yes, it is. > > Any reason why you did not request a CVE for #251? Yes. It was already reported here: https://bugzilla.mozilla.org/show_bug.cgi?id=1275400 (CVE-2016-5824) but it was never officially reported upstream (and therefore, never fixed). > >> It is worth to mention there is a very similar bug found (CVE-2016-5824) on >> the libical version used by >> Thunderbird but we think is *not* the same as this one. In fact, we've >> tested it on Thunderbird and it does *not* crash. >> >> The reproducer is available upon request. > > #253 has a reproducer here: > https://github.com/libical/libical/files/627392/heap-use-after-free.ical.txt > > Is this the same file? It is not the same file in fact. We found a variation of the original input that trigger this read out-of-bounds to read more than 60 bytes. This looks more serious than usual (maybe you can read as much as you want) . We had some complains in the past for making public test cases .. > > If it's a different file, then I'd like to have access to the file but I > would prefer if it was just available publicly and not to me only. Feel free to make the file public if you want. > > Cheers, > -- > Raphaël Hertzog ◈ Debian Developer > > Support Debian LTS: http://www.freexian.com/services/debian-lts.html > Learn to master Debian: http://debian-handbook.info/get/
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