Date: Fri, 16 Sep 2016 02:15:59 +0000 From: Gulshan Singh <gsingh2011@...il.com> To: OSS Security List <oss-security@...ts.openwall.com> Subject: Re: Libarchive/bsdtar: multiple crashes I dug into https://blogs.gentoo.org/ago/2016/09/11/libarchive-bsdtar-memory-corruptionunknown-crash-in-bid_entry-archive_read_support_format_mtree-c/, which I had reported here earlier (thanks for the mention): https://github.com/libarchive/libarchive/issues/747 After digging into the bug, it seemed it wasn't exploitable, and could only lead to a crash, so I decided to not send it out to the list and request a CVE. On Thu, Sep 15, 2016 at 8:54 AM Agostino Sarubbo <ago@...too.org> wrote: > Hello all. > > I'd like to make people aware of the following crashes in libarchive/bsdtar > found by fuzzing (all issues are public on github): > > The most dangerous, an out of bounds stack write (which is also fixed > upstream): > > https://blogs.gentoo.org/ago/2016/09/11/libarchive-bsdtar-stack-based-buffer-overflow-in-bsdtar_expand_char-util-c/ > > > The following are buffer over read of 1 (all are unfixed upstream ATM): > > > https://blogs.gentoo.org/ago/2016/09/11/libarchive-bsdtar-heap-based-buffer-overflow-in-detect_form-archive_read_support_format_mtree-c/ > > https://blogs.gentoo.org/ago/2016/09/11/libarchive-bsdtar-heap-based-buffer-overflow-in-read_header-archive_read_support_format_7zip-c/ > > https://blogs.gentoo.org/ago/2016/09/11/libarchive-bsdtar-memory-corruptionunknown-crash-in-bid_entry-archive_read_support_format_mtree-c/ > > https://blogs.gentoo.org/ago/2016/09/11/libarchive-bsdtar-heap-based-buffer-overflow-in-bid_entry-archive_read_support_format_mtree-c/ > > As stated in the posts, the two latest bug could be the same, but I didn't > have an upstream response about, so I posted both stacktrace to better > track > the issues. > > > The following are use-after-free (all are unfixed upstream ATM): > > https://blogs.gentoo.org/ago/2016/09/11/libarchive-bsdtar-use-after-free-in-bid_entry-archive_read_support_format_mtree-c/ > > https://blogs.gentoo.org/ago/2016/09/11/libarchive-bsdtar-use-after-free-in-detect_form-archive_read_support_format_mtree-c/ > > As stated in the posts, they could be the same. > I didn't have an upstream response too for those. > > > Agostino >
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