heimdal is vulnerable to privilege escalation. The vulnerability exists as heimdal before 7.4 allows remote attackers to impersonate services with Orpheusβ 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.
www.debian.org/security/2017/dsa-3912
www.h5l.org/advisories.html?show=2017-07-11
www.securityfocus.com/bid/99551
www.securitytracker.com/id/1038876
www.securitytracker.com/id/1039427
github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0
support.apple.com/HT208112
support.apple.com/HT208144
support.apple.com/HT208221
www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc
www.orpheus-lyre.info/
www.samba.org/samba/security/CVE-2017-11103.html