CVE-2017-11103

Heimdal before 7.4 allows remote attackers to impersonate services with
Orpheus’ Lyre attacks because it obtains service-principal names in a way
that violates the Kerberos 5 protocol specification. In
_krb5_extract_ticket() the KDC-REP service name must be obtained from the
encrypted version stored in ‘enc_part’ instead of the unencrypted version
stored in ‘ticket’. Use of the unencrypted version provides an opportunity
for successful server impersonation and other attacks. NOTE: this CVE is
only for Heimdal and other products that embed Heimdal code; it does not
apply to other instances in which this part of the Kerberos 5 protocol
specification is violated.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=868209&gt;
• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=868208&gt;