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 Heimdalcode; it does not apply to other instances in which this part of the Kerberos 5 protocol specification is violated.