Detections
Analytics
CVE-2017-11103
high
Description
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.
References
https://www.samba.org/samba/security/CVE-2017-11103.html
https://www.orpheus-lyre.info/
https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc
https://support.apple.com/HT208221
https://support.apple.com/HT208144
https://support.apple.com/HT208112
https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0
http://www.securitytracker.com/id/1039427
http://www.securitytracker.com/id/1038876