CVE-2018-8970: Improper Certificate Validation

The intx509paramsethosts function in lib/libcrypto/x509/x509vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain...