libytnef vulnerabilities

It was discovered that Yerase’s TNEF had null pointer dereferences, infinite
loop, buffer overflow, out of bounds reads, directory traversal issues and
other vulnerabilities. An attacker could use those issues to cause a crash
and consequently a denial of service. (CVE-2017-6298, CVE-2017-6299,
CVE-2017-6300, CVE-2017-6301, CVE-2017-6302, CVE-2017-6303, CVE-2017-6304,
CVE-2017-6305, CVE-2017-6306, CVE-2017-6800, CVE-2017-6801, CVE-2017-6802)