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Created attachment 1365485 [details]
poc to trigger the vulnerability

on 0.26 (the latest version):

there is a reachable assertion aborted in Exiv2::(anonymous namespace)::readHeader in bigtiffimage.cpp, which can be triggered by poc_2.tiff in the attachment.

Note that this vulnerability exists in the exiv2 library, any software using
exiv2 will be affected by this vulnerability. Remote attackers can exploit
this vulnerability cause a denial of service via a crafted tiff file.

As a demonstration, please run the following command-line to trigger this
vulnerability:

./bin/exiv2 poc_2.tiff
exiv2: /homes/you58/exiv2/master/src/bigtiffimage.cpp:113: Exiv2::(anonymous namespace)::Header Exiv2::(anonymous namespace)::readHeader(Exiv2::BasicIo &): Assertion `size == 8' failed.
Aborted (core dumped)

Fixed with exiv2-0.27.0-1.el7_6.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:2101