In _krb5_extract_ticket() the KDC-REP service name must be obtained from
encrypted version stored in 'enc_part' instead of the unencrypted version
stored in 'ticket'. Use of the unecrypted version provides an
opportunity for successful server impersonation and other attacks.
Identified by Jeffrey Altman, Viktor Duchovni and Nico Williams.
Change-Id: I45ef61e8a46e0f6588d64b5bd572a24c7432547c
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12894
(based on heimdal commit
6dd3eb836bbb80a00ffced4ad57077a1cdf227ea)
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Wed Jul 12 17:44:50 CEST 2017 on sn-devel-144
/* check server referral and save principal */
ret = _krb5_principalname2krb5_principal (context,
&tmp_principal,
- rep->kdc_rep.ticket.sname,
- rep->kdc_rep.ticket.realm);
+ rep->enc_part.sname,
+ rep->enc_part.srealm);
if (ret)
goto out;
if((flags & EXTRACT_TICKET_ALLOW_SERVER_MISMATCH) == 0){