The asn1f_lookup_symbol_impl function in asn1fix_retrieve.c in libasn1fix.a in asn1c 0.9.28 allows remote attackers to cause a denial of service (segmentation fault) via a crafted .asn1 file.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-4487
https://drive.google.com/open?id=0B9DojFnTUSNGd05zSHI1RmpKQjQ