Attachment 16937 Details for Bug 12444 – backport for 4.6

[patch] backport for 4.6

CVE-2016-2124-4.6.patch (text/plain), 3.56 KB, created by Noel Power on 2021-11-03 16:45:21 UTC

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Creator: Noel Power

Created: 2021-11-03 16:45:21 UTC

Size: 3.56 KB

patch

obsolete

>From 1ac424347246e410e36d62e1b330cde246f1963d Mon Sep 17 00:00:00 2001
>From: Stefan Metzmacher <metze@samba.org>
>Date: Thu, 24 Nov 2016 09:12:59 +0100
>Subject: [PATCH 1/2] CVE-2016-2124: s4:libcli/sesssetup: don't fallback to non
> spnego authentication if we require kerberos
>
>We should not send NTLM[v2] data on the wire if the user asked for kerberos
>only.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12444
>
>Signed-off-by: Stefan Metzmacher <metze@samba.org>
>---
> source4/libcli/smb_composite/sesssetup.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
>diff --git a/source4/libcli/smb_composite/sesssetup.c b/source4/libcli/smb_composite/sesssetup.c
>index 9f989f21f2c..f2dbcd59b0d 100644
>--- a/source4/libcli/smb_composite/sesssetup.c
>+++ b/source4/libcli/smb_composite/sesssetup.c
>@@ -595,6 +595,8 @@ struct composite_context *smb_composite_sesssetup_send(struct smbcli_session *se
> 	struct composite_context *c;
> 	struct sesssetup_state *state;
> 	NTSTATUS status;
>+	enum credentials_use_kerberos krb5_state =
>+		cli_credentials_get_kerberos_state(io->in.credentials);
> 
> 	c = composite_create(session, session->transport->ev);
> 	if (c == NULL) return NULL;
>@@ -609,6 +611,10 @@ struct composite_context *smb_composite_sesssetup_send(struct smbcli_session *se
> 
> 	/* no session setup at all in earliest protocol varients */
> 	if (session->transport->negotiate.protocol < PROTOCOL_LANMAN1) {
>+		if (krb5_state == CRED_MUST_USE_KERBEROS) {
>+			composite_error(c, NT_STATUS_NETWORK_CREDENTIAL_CONFLICT);
>+			return c;
>+		}
> 		ZERO_STRUCT(io->out);
> 		composite_done(c);
> 		return c;
>@@ -616,9 +622,17 @@ struct composite_context *smb_composite_sesssetup_send(struct smbcli_session *se
> 
> 	/* see what session setup interface we will use */
> 	if (session->transport->negotiate.protocol < PROTOCOL_NT1) {
>+		if (krb5_state == CRED_MUST_USE_KERBEROS) {
>+			composite_error(c, NT_STATUS_NETWORK_CREDENTIAL_CONFLICT);
>+			return c;
>+		}
> 		status = session_setup_old(c, session, io, &state->req);
> 	} else if (!session->transport->options.use_spnego ||
> 		   !(io->in.capabilities & CAP_EXTENDED_SECURITY)) {
>+		if (krb5_state == CRED_MUST_USE_KERBEROS) {
>+			composite_error(c, NT_STATUS_NETWORK_CREDENTIAL_CONFLICT);
>+			return c;
>+		}
> 		status = session_setup_nt1(c, session, io, &state->req);
> 	} else {
> 		status = session_setup_spnego(c, session, io, &state->req);
>-- 
>2.31.1
>
>
>From aa44f49eb87720a99c06308f42c9fa42073eb05b Mon Sep 17 00:00:00 2001
>From: Stefan Metzmacher <metze@samba.org>
>Date: Thu, 27 Oct 2016 10:40:28 +0200
>Subject: [PATCH 2/2] CVE-2016-2124: s3:libsmb: don't fallback to non spnego
> authentication if we require kerberos
>
>We should not send NTLM[v2] nor plaintext data on the wire if the user
>asked for kerberos only.
>
>BUG: https://bugzilla.samba.org/show_bug.cgi?id=12444
>
>Signed-off-by: Stefan Metzmacher <metze@samba.org>
>---
> source3/libsmb/cliconnect.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
>diff --git a/source3/libsmb/cliconnect.c b/source3/libsmb/cliconnect.c
>index 7f03e8be26f..3019d524cc5 100644
>--- a/source3/libsmb/cliconnect.c
>+++ b/source3/libsmb/cliconnect.c
>@@ -1458,6 +1458,13 @@ struct tevent_req *cli_session_setup_creds_send(TALLOC_CTX *mem_ctx,
> 		return req;
> 	}
> 
>+	if (krb5_state == CRED_MUST_USE_KERBEROS) {
>+		DBG_WARNING("Kerberos authentication requested, but "
>+			    "the server does not support SPNEGO authentication\n");
>+		tevent_req_nterror(req, NT_STATUS_NETWORK_CREDENTIAL_CONFLICT);
>+		return tevent_req_post(req, ev);
>+	}
>+
> 	if (smbXcli_conn_protocol(cli->conn) < PROTOCOL_LANMAN1) {
> 		/*
> 		 * SessionSetupAndX was introduced by LANMAN 1.0. So we skip
>-- 
>2.31.1
>

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