samba: Security Advisory - CVE-2013-4496

Samba 3.x before 3.6.23, 4.0.x before 4.0.16, and 4.1.x before 4.1.6
does not enforce the password-guessing protection mechanism for all
interfaces, which makes it easier for remote attackers to obtain access
via brute-force ChangePasswordUser2 (1) SAMR or (2) RAP attempts.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-4496

Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
(cherry picked from commit 3d5d8c6d0f21de60dc84610a4d47da2d8c062901)
Signed-off-by: Andreas Oberritter <obi@opendreambox.org>

2 files changed, 967 insertions, 0 deletions

diff --git a/meta-oe/recipes-connectivity/samba/samba/samba-3.6.22-CVE-2013-4496.patch b/meta-oe/recipes-connectivity/samba/samba/samba-3.6.22-CVE-2013-4496.patch
new file mode 100644
index 0000000000..c190a6c507
--- /dev/null
+++ b/meta-oe/recipes-connectivity/samba/samba/samba-3.6.22-CVE-2013-4496.patch
@@ -0,0 +1,966 @@
+Upstream-Status: Backport
+
+From 25066eb31d6608075b5993b0d19b3e0843cdadeb Mon Sep 17 00:00:00 2001
+From: Andrew Bartlett <abartlet@samba.org>
+Date: Fri, 1 Nov 2013 14:55:44 +1300
+Subject: [PATCH 1/3] CVE-2013-4496:s3-samr: Block attempts to crack passwords
+ via repeated password changes
+
+Bug: https://bugzilla.samba.org/show_bug.cgi?id=10245
+
+Signed-off-by: Andrew Bartlett <abartlet@samba.org>
+Signed-off-by: Stefan Metzmacher <metze@samba.org>
+Signed-off-by: Jeremy Allison <jra@samba.org>
+Reviewed-by: Stefan Metzmacher <metze@samba.org>
+Reviewed-by: Jeremy Allison <jra@samba.org>
+Reviewed-by: Andreas Schneider <asn@samba.org>
+---
+ source3/rpc_server/samr/srv_samr_chgpasswd.c |   55 ++++++++++++++++
+ source3/rpc_server/samr/srv_samr_nt.c        |   90 +++++++++++++++++++++-----
+ 2 files changed, 129 insertions(+), 16 deletions(-)
+
+diff --git a/source3/rpc_server/samr/srv_samr_chgpasswd.c b/source3/rpc_server/samr/srv_samr_chgpasswd.c
+index 0b4b25b..59905be 100644
+--- a/source3/rpc_server/samr/srv_samr_chgpasswd.c
++++ b/source3/rpc_server/samr/srv_samr_chgpasswd.c
+@@ -1106,6 +1106,8 @@ NTSTATUS pass_oem_change(char *user, const char *rhost,
+ 	struct samu *sampass = NULL;
+ 	NTSTATUS nt_status;
+ 	bool ret = false;
++	bool updated_badpw = false;
++	NTSTATUS update_login_attempts_status;
+ 
+ 	if (!(sampass = samu_new(NULL))) {
+ 		return NT_STATUS_NO_MEMORY;
+@@ -1121,6 +1123,13 @@ NTSTATUS pass_oem_change(char *user, const char *rhost,
+ 		return NT_STATUS_NO_SUCH_USER;
+ 	}
+ 
++	/* Quit if the account was locked out. */
++	if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
++		DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", user));
++		TALLOC_FREE(sampass);
++		return NT_STATUS_ACCOUNT_LOCKED_OUT;
++	}
++
+ 	nt_status = check_oem_password(user,
+ 				       password_encrypted_with_lm_hash,
+ 				       old_lm_hash_encrypted,
+@@ -1129,6 +1138,52 @@ NTSTATUS pass_oem_change(char *user, const char *rhost,
+ 				       sampass,
+ 				       &new_passwd);
+ 
++	/*
++	 * Notify passdb backend of login success/failure. If not
++	 * NT_STATUS_OK the backend doesn't like the login
++	 */
++	update_login_attempts_status = pdb_update_login_attempts(sampass,
++						NT_STATUS_IS_OK(nt_status));
++
++	if (!NT_STATUS_IS_OK(nt_status)) {
++		bool increment_bad_pw_count = false;
++
++		if (NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) &&
++		    (pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
++		    NT_STATUS_IS_OK(update_login_attempts_status))
++		{
++			increment_bad_pw_count = true;
++		}
++
++		if (increment_bad_pw_count) {
++			pdb_increment_bad_password_count(sampass);
++			updated_badpw = true;
++		} else {
++			pdb_update_bad_password_count(sampass,
++						      &updated_badpw);
++		}
++	} else {
++
++		if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
++		    (pdb_get_bad_password_count(sampass) > 0)){
++			pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
++			pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
++			updated_badpw = true;
++		}
++	}
++
++	if (updated_badpw) {
++		NTSTATUS update_status;
++		become_root();
++		update_status = pdb_update_sam_account(sampass);
++		unbecome_root();
++
++		if (!NT_STATUS_IS_OK(update_status)) {
++			DEBUG(1, ("Failed to modify entry: %s\n",
++				  nt_errstr(update_status)));
++		}
++	}
++
+ 	if (!NT_STATUS_IS_OK(nt_status)) {
+ 		TALLOC_FREE(sampass);
+ 		return nt_status;
+diff --git a/source3/rpc_server/samr/srv_samr_nt.c b/source3/rpc_server/samr/srv_samr_nt.c
+index 78ef1ba..3241b97 100644
+--- a/source3/rpc_server/samr/srv_samr_nt.c
++++ b/source3/rpc_server/samr/srv_samr_nt.c
+@@ -1715,9 +1715,11 @@ NTSTATUS _samr_ChangePasswordUser(struct pipes_struct *p,
+ 	NTSTATUS status;
+ 	bool ret = false;
+ 	struct samr_user_info *uinfo;
+-	struct samu *pwd;
++	struct samu *pwd = NULL;
+ 	struct samr_Password new_lmPwdHash, new_ntPwdHash, checkHash;
+ 	struct samr_Password lm_pwd, nt_pwd;
++	bool updated_badpw = false;
++	NTSTATUS update_login_attempts_status;
+ 
+ 	uinfo = policy_handle_find(p, r->in.user_handle,
+ 				   SAMR_USER_ACCESS_SET_PASSWORD, NULL,
+@@ -1729,6 +1731,15 @@ NTSTATUS _samr_ChangePasswordUser(struct pipes_struct *p,
+ 	DEBUG(5,("_samr_ChangePasswordUser: sid:%s\n",
+ 		  sid_string_dbg(&uinfo->sid)));
+ 
++	/* basic sanity checking on parameters.  Do this before any database ops */
++	if (!r->in.lm_present || !r->in.nt_present ||
++	    !r->in.old_lm_crypted || !r->in.new_lm_crypted ||
++	    !r->in.old_nt_crypted || !r->in.new_nt_crypted) {
++		/* we should really handle a change with lm not
++		   present */
++		return NT_STATUS_INVALID_PARAMETER_MIX;
++	}
++
+ 	if (!(pwd = samu_new(NULL))) {
+ 		return NT_STATUS_NO_MEMORY;
+ 	}
+@@ -1742,6 +1753,14 @@ NTSTATUS _samr_ChangePasswordUser(struct pipes_struct *p,
+ 		return NT_STATUS_WRONG_PASSWORD;
+ 	}
+ 
++	/* Quit if the account was locked out. */
++	if (pdb_get_acct_ctrl(pwd) & ACB_AUTOLOCK) {
++		DEBUG(3, ("Account for user %s was locked out.\n",
++			  pdb_get_username(pwd)));
++		status = NT_STATUS_ACCOUNT_LOCKED_OUT;
++		goto out;
++	}
++
+ 	{
+ 		const uint8_t *lm_pass, *nt_pass;
+ 
+@@ -1750,29 +1769,19 @@ NTSTATUS _samr_ChangePasswordUser(struct pipes_struct *p,
+ 
+ 		if (!lm_pass || !nt_pass) {
+ 			status = NT_STATUS_WRONG_PASSWORD;
+-			goto out;
++			goto update_login;
+ 		}
+ 
+ 		memcpy(&lm_pwd.hash, lm_pass, sizeof(lm_pwd.hash));
+ 		memcpy(&nt_pwd.hash, nt_pass, sizeof(nt_pwd.hash));
+ 	}
+ 
+-	/* basic sanity checking on parameters.  Do this before any database ops */
+-	if (!r->in.lm_present || !r->in.nt_present ||
+-	    !r->in.old_lm_crypted || !r->in.new_lm_crypted ||
+-	    !r->in.old_nt_crypted || !r->in.new_nt_crypted) {
+-		/* we should really handle a change with lm not
+-		   present */
+-		status = NT_STATUS_INVALID_PARAMETER_MIX;
+-		goto out;
+-	}
+-
+ 	/* decrypt and check the new lm hash */
+ 	D_P16(lm_pwd.hash, r->in.new_lm_crypted->hash, new_lmPwdHash.hash);
+ 	D_P16(new_lmPwdHash.hash, r->in.old_lm_crypted->hash, checkHash.hash);
+ 	if (memcmp(checkHash.hash, lm_pwd.hash, 16) != 0) {
+ 		status = NT_STATUS_WRONG_PASSWORD;
+-		goto out;
++		goto update_login;
+ 	}
+ 
+ 	/* decrypt and check the new nt hash */
+@@ -1780,7 +1789,7 @@ NTSTATUS _samr_ChangePasswordUser(struct pipes_struct *p,
+ 	D_P16(new_ntPwdHash.hash, r->in.old_nt_crypted->hash, checkHash.hash);
+ 	if (memcmp(checkHash.hash, nt_pwd.hash, 16) != 0) {
+ 		status = NT_STATUS_WRONG_PASSWORD;
+-		goto out;
++		goto update_login;
+ 	}
+ 
+ 	/* The NT Cross is not required by Win2k3 R2, but if present
+@@ -1789,7 +1798,7 @@ NTSTATUS _samr_ChangePasswordUser(struct pipes_struct *p,
+ 		D_P16(lm_pwd.hash, r->in.nt_cross->hash, checkHash.hash);
+ 		if (memcmp(checkHash.hash, new_ntPwdHash.hash, 16) != 0) {
+ 			status = NT_STATUS_WRONG_PASSWORD;
+-			goto out;
++			goto update_login;
+ 		}
+ 	}
+ 
+@@ -1799,7 +1808,7 @@ NTSTATUS _samr_ChangePasswordUser(struct pipes_struct *p,
+ 		D_P16(nt_pwd.hash, r->in.lm_cross->hash, checkHash.hash);
+ 		if (memcmp(checkHash.hash, new_lmPwdHash.hash, 16) != 0) {
+ 			status = NT_STATUS_WRONG_PASSWORD;
+-			goto out;
++			goto update_login;
+ 		}
+ 	}
+ 
+@@ -1810,6 +1819,55 @@ NTSTATUS _samr_ChangePasswordUser(struct pipes_struct *p,
+ 	}
+ 
+ 	status = pdb_update_sam_account(pwd);
++
++update_login:
++
++	/*
++	 * Notify passdb backend of login success/failure. If not
++	 * NT_STATUS_OK the backend doesn't like the login
++	 */
++	update_login_attempts_status = pdb_update_login_attempts(pwd,
++						NT_STATUS_IS_OK(status));
++
++	if (!NT_STATUS_IS_OK(status)) {
++		bool increment_bad_pw_count = false;
++
++		if (NT_STATUS_EQUAL(status,NT_STATUS_WRONG_PASSWORD) &&
++		    (pdb_get_acct_ctrl(pwd) & ACB_NORMAL) &&
++		    NT_STATUS_IS_OK(update_login_attempts_status))
++		{
++			increment_bad_pw_count = true;
++		}
++
++		if (increment_bad_pw_count) {
++			pdb_increment_bad_password_count(pwd);
++			updated_badpw = true;
++		} else {
++			pdb_update_bad_password_count(pwd,
++						      &updated_badpw);
++		}
++	} else {
++
++		if ((pdb_get_acct_ctrl(pwd) & ACB_NORMAL) &&
++		    (pdb_get_bad_password_count(pwd) > 0)){
++			pdb_set_bad_password_count(pwd, 0, PDB_CHANGED);
++			pdb_set_bad_password_time(pwd, 0, PDB_CHANGED);
++			updated_badpw = true;
++		}
++	}
++
++	if (updated_badpw) {
++		NTSTATUS update_status;
++		become_root();
++		update_status = pdb_update_sam_account(pwd);
++		unbecome_root();
++
++		if (!NT_STATUS_IS_OK(update_status)) {
++			DEBUG(1, ("Failed to modify entry: %s\n",
++				  nt_errstr(update_status)));
++		}
++	}
++
+  out:
+ 	TALLOC_FREE(pwd);
+ 
+-- 
+1.7.9.5
+
+
+From 059da248cf69a3b0ef29836f49367b938fb1cbda Mon Sep 17 00:00:00 2001
+From: Stefan Metzmacher <metze@samba.org>
+Date: Tue, 5 Nov 2013 14:04:20 +0100
+Subject: [PATCH 2/3] CVE-2013-4496:s3:auth: fix memory leak in the
+ ACCOUNT_LOCKED_OUT case.
+
+Bug: https://bugzilla.samba.org/show_bug.cgi?id=10245
+
+Signed-off-by: Stefan Metzmacher <metze@samba.org>
+Reviewed-by: Jeremy Allison <jra@samba.org>
+Signed-off-by: Andrew Bartlett <abartlet@samba.org>
+Reviewed-by: Andreas Schneider <asn@samba.org>
+---
+ source3/auth/check_samsec.c |    1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/source3/auth/check_samsec.c b/source3/auth/check_samsec.c
+index f918dc0..e2c42d6 100644
+--- a/source3/auth/check_samsec.c
++++ b/source3/auth/check_samsec.c
+@@ -408,6 +408,7 @@ NTSTATUS check_sam_security(const DATA_BLOB *challenge,
+ 	/* Quit if the account was locked out. */
+ 	if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
+ 		DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", username));
++		TALLOC_FREE(sampass);
+ 		return NT_STATUS_ACCOUNT_LOCKED_OUT;
+ 	}
+ 
+-- 
+1.7.9.5
+
+
+From 27f982ef33a1238ae48d7a38d608dd23ebde61ae Mon Sep 17 00:00:00 2001
+From: Andrew Bartlett <abartlet@samba.org>
+Date: Tue, 5 Nov 2013 16:16:46 +1300
+Subject: [PATCH 3/3] CVE-2013-4496:samr: Remove ChangePasswordUser
+
+This old password change mechanism does not provide the plaintext to
+validate against password complexity, and it is not used by modern
+clients.
+
+The missing features in both implementations (by design) were:
+
+ - the password complexity checks (no plaintext)
+ - the minimum password length (no plaintext)
+
+Additionally, the source3 version did not check:
+
+ - the minimum password age
+ - pdb_get_pass_can_change() which checks the security
+   descriptor for the 'user cannot change password' setting.
+ - the password history
+ - the output of the 'passwd program' if 'unix passwd sync = yes'.
+
+Finally, the mechanism was almost useless, as it was incorrectly
+only made available to administrative users with permission
+to reset the password.  It is removed here so that it is not
+mistakenly reinstated in the future.
+
+Andrew Bartlett
+
+Bug: https://bugzilla.samba.org/show_bug.cgi?id=10245
+
+Signed-off-by: Andrew Bartlett <abartlet@samba.org>
+Reviewed-by: Andreas Schneider <asn@samba.org>
+Reviewed-by: Stefan Metzmacher <metze@samba.org>
+---
+ source3/rpc_server/samr/srv_samr_nt.c   |  169 +-------------------
+ source3/smbd/lanman.c                   |  254 -------------------------------
+ source4/rpc_server/samr/samr_password.c |  126 +--------------
+ source4/torture/rpc/samr.c              |   12 +-
+ 4 files changed, 24 insertions(+), 537 deletions(-)
+
+diff --git a/source3/rpc_server/samr/srv_samr_nt.c b/source3/rpc_server/samr/srv_samr_nt.c
+index 3241b97..2519a3f 100644
+--- a/source3/rpc_server/samr/srv_samr_nt.c
++++ b/source3/rpc_server/samr/srv_samr_nt.c
+@@ -1706,172 +1706,19 @@ NTSTATUS _samr_LookupNames(struct pipes_struct *p,
+ }
+ 
+ /****************************************************************
+- _samr_ChangePasswordUser
++ _samr_ChangePasswordUser.
++
++ So old it is just not worth implementing
++ because it does not supply a plaintext and so we can't do password
++ complexity checking and cannot update other services that use a
++ plaintext password via passwd chat/pam password change/ldap password
++ sync.
+ ****************************************************************/
+ 
+ NTSTATUS _samr_ChangePasswordUser(struct pipes_struct *p,
+ 				  struct samr_ChangePasswordUser *r)
+ {
+-	NTSTATUS status;
+-	bool ret = false;
+-	struct samr_user_info *uinfo;
+-	struct samu *pwd = NULL;
+-	struct samr_Password new_lmPwdHash, new_ntPwdHash, checkHash;
+-	struct samr_Password lm_pwd, nt_pwd;
+-	bool updated_badpw = false;
+-	NTSTATUS update_login_attempts_status;
+-
+-	uinfo = policy_handle_find(p, r->in.user_handle,
+-				   SAMR_USER_ACCESS_SET_PASSWORD, NULL,
+-				   struct samr_user_info, &status);
+-	if (!NT_STATUS_IS_OK(status)) {
+-		return status;
+-	}
+-
+-	DEBUG(5,("_samr_ChangePasswordUser: sid:%s\n",
+-		  sid_string_dbg(&uinfo->sid)));
+-
+-	/* basic sanity checking on parameters.  Do this before any database ops */
+-	if (!r->in.lm_present || !r->in.nt_present ||
+-	    !r->in.old_lm_crypted || !r->in.new_lm_crypted ||
+-	    !r->in.old_nt_crypted || !r->in.new_nt_crypted) {
+-		/* we should really handle a change with lm not
+-		   present */
+-		return NT_STATUS_INVALID_PARAMETER_MIX;
+-	}
+-
+-	if (!(pwd = samu_new(NULL))) {
+-		return NT_STATUS_NO_MEMORY;
+-	}
+-
+-	become_root();
+-	ret = pdb_getsampwsid(pwd, &uinfo->sid);
+-	unbecome_root();
+-
+-	if (!ret) {
+-		TALLOC_FREE(pwd);
+-		return NT_STATUS_WRONG_PASSWORD;
+-	}
+-
+-	/* Quit if the account was locked out. */
+-	if (pdb_get_acct_ctrl(pwd) & ACB_AUTOLOCK) {
+-		DEBUG(3, ("Account for user %s was locked out.\n",
+-			  pdb_get_username(pwd)));
+-		status = NT_STATUS_ACCOUNT_LOCKED_OUT;
+-		goto out;
+-	}
+-
+-	{
+-		const uint8_t *lm_pass, *nt_pass;
+-
+-		lm_pass = pdb_get_lanman_passwd(pwd);
+-		nt_pass = pdb_get_nt_passwd(pwd);
+-
+-		if (!lm_pass || !nt_pass) {
+-			status = NT_STATUS_WRONG_PASSWORD;
+-			goto update_login;
+-		}
+-
+-		memcpy(&lm_pwd.hash, lm_pass, sizeof(lm_pwd.hash));
+-		memcpy(&nt_pwd.hash, nt_pass, sizeof(nt_pwd.hash));
+-	}
+-
+-	/* decrypt and check the new lm hash */
+-	D_P16(lm_pwd.hash, r->in.new_lm_crypted->hash, new_lmPwdHash.hash);
+-	D_P16(new_lmPwdHash.hash, r->in.old_lm_crypted->hash, checkHash.hash);
+-	if (memcmp(checkHash.hash, lm_pwd.hash, 16) != 0) {
+-		status = NT_STATUS_WRONG_PASSWORD;
+-		goto update_login;
+-	}
+-
+-	/* decrypt and check the new nt hash */
+-	D_P16(nt_pwd.hash, r->in.new_nt_crypted->hash, new_ntPwdHash.hash);
+-	D_P16(new_ntPwdHash.hash, r->in.old_nt_crypted->hash, checkHash.hash);
+-	if (memcmp(checkHash.hash, nt_pwd.hash, 16) != 0) {
+-		status = NT_STATUS_WRONG_PASSWORD;
+-		goto update_login;
+-	}
+-
+-	/* The NT Cross is not required by Win2k3 R2, but if present
+-	   check the nt cross hash */
+-	if (r->in.cross1_present && r->in.nt_cross) {
+-		D_P16(lm_pwd.hash, r->in.nt_cross->hash, checkHash.hash);
+-		if (memcmp(checkHash.hash, new_ntPwdHash.hash, 16) != 0) {
+-			status = NT_STATUS_WRONG_PASSWORD;
+-			goto update_login;
+-		}
+-	}
+-
+-	/* The LM Cross is not required by Win2k3 R2, but if present
+-	   check the lm cross hash */
+-	if (r->in.cross2_present && r->in.lm_cross) {
+-		D_P16(nt_pwd.hash, r->in.lm_cross->hash, checkHash.hash);
+-		if (memcmp(checkHash.hash, new_lmPwdHash.hash, 16) != 0) {
+-			status = NT_STATUS_WRONG_PASSWORD;
+-			goto update_login;
+-		}
+-	}
+-
+-	if (!pdb_set_nt_passwd(pwd, new_ntPwdHash.hash, PDB_CHANGED) ||
+-	    !pdb_set_lanman_passwd(pwd, new_lmPwdHash.hash, PDB_CHANGED)) {
+-		status = NT_STATUS_ACCESS_DENIED;
+-		goto out;
+-	}
+-
+-	status = pdb_update_sam_account(pwd);
+-
+-update_login:
+-
+-	/*
+-	 * Notify passdb backend of login success/failure. If not
+-	 * NT_STATUS_OK the backend doesn't like the login
+-	 */
+-	update_login_attempts_status = pdb_update_login_attempts(pwd,
+-						NT_STATUS_IS_OK(status));
+-
+-	if (!NT_STATUS_IS_OK(status)) {
+-		bool increment_bad_pw_count = false;
+-
+-		if (NT_STATUS_EQUAL(status,NT_STATUS_WRONG_PASSWORD) &&
+-		    (pdb_get_acct_ctrl(pwd) & ACB_NORMAL) &&
+-		    NT_STATUS_IS_OK(update_login_attempts_status))
+-		{
+-			increment_bad_pw_count = true;
+-		}
+-
+-		if (increment_bad_pw_count) {
+-			pdb_increment_bad_password_count(pwd);
+-			updated_badpw = true;
+-		} else {
+-			pdb_update_bad_password_count(pwd,
+-						      &updated_badpw);
+-		}
+-	} else {
+-
+-		if ((pdb_get_acct_ctrl(pwd) & ACB_NORMAL) &&
+-		    (pdb_get_bad_password_count(pwd) > 0)){
+-			pdb_set_bad_password_count(pwd, 0, PDB_CHANGED);
+-			pdb_set_bad_password_time(pwd, 0, PDB_CHANGED);
+-			updated_badpw = true;
+-		}
+-	}
+-
+-	if (updated_badpw) {
+-		NTSTATUS update_status;
+-		become_root();
+-		update_status = pdb_update_sam_account(pwd);
+-		unbecome_root();
+-
+-		if (!NT_STATUS_IS_OK(update_status)) {
+-			DEBUG(1, ("Failed to modify entry: %s\n",
+-				  nt_errstr(update_status)));
+-		}
+-	}
+-
+- out:
+-	TALLOC_FREE(pwd);
+-
+-	return status;
++	return NT_STATUS_NOT_IMPLEMENTED;
+ }
+ 
+ /*******************************************************************
+diff --git a/source3/smbd/lanman.c b/source3/smbd/lanman.c
+index aef12df..3b4ec65 100644
+--- a/source3/smbd/lanman.c
++++ b/source3/smbd/lanman.c
+@@ -2947,259 +2947,6 @@ static bool api_NetRemoteTOD(struct smbd_server_connection *sconn,
+ }
+ 
+ /****************************************************************************
+- Set the user password.
+-*****************************************************************************/
+-
+-static bool api_SetUserPassword(struct smbd_server_connection *sconn,
+-				connection_struct *conn,uint16 vuid,
+-				char *param, int tpscnt,
+-				char *data, int tdscnt,
+-				int mdrcnt,int mprcnt,
+-				char **rdata,char **rparam,
+-				int *rdata_len,int *rparam_len)
+-{
+-	char *np = get_safe_str_ptr(param,tpscnt,param,2);
+-	char *p = NULL;
+-	fstring user;
+-	fstring pass1,pass2;
+-	TALLOC_CTX *mem_ctx = talloc_tos();
+-	NTSTATUS status, result;
+-	struct rpc_pipe_client *cli = NULL;
+-	struct policy_handle connect_handle, domain_handle, user_handle;
+-	struct lsa_String domain_name;
+-	struct dom_sid2 *domain_sid;
+-	struct lsa_String names;
+-	struct samr_Ids rids;
+-	struct samr_Ids types;
+-	struct samr_Password old_lm_hash;
+-	struct samr_Password new_lm_hash;
+-	int errcode = NERR_badpass;
+-	uint32_t rid;
+-	int encrypted;
+-	int min_pwd_length;
+-	struct dcerpc_binding_handle *b = NULL;
+-
+-	/* Skip 2 strings. */
+-	p = skip_string(param,tpscnt,np);
+-	p = skip_string(param,tpscnt,p);
+-
+-	if (!np || !p) {
+-		return False;
+-	}
+-
+-	/* Do we have a string ? */
+-	if (skip_string(param,tpscnt,p) == NULL) {
+-		return False;
+-	}
+-	pull_ascii_fstring(user,p);
+-
+-	p = skip_string(param,tpscnt,p);
+-	if (!p) {
+-		return False;
+-	}
+-
+-	memset(pass1,'\0',sizeof(pass1));
+-	memset(pass2,'\0',sizeof(pass2));
+-	/*
+-	 * We use 31 here not 32 as we're checking
+-	 * the last byte we want to access is safe.
+-	 */
+-	if (!is_offset_safe(param,tpscnt,p,31)) {
+-		return False;
+-	}
+-	memcpy(pass1,p,16);
+-	memcpy(pass2,p+16,16);
+-
+-	encrypted = get_safe_SVAL(param,tpscnt,p+32,0,-1);
+-	if (encrypted == -1) {
+-		errcode = W_ERROR_V(WERR_INVALID_PARAM);
+-		goto out;
+-	}
+-
+-	min_pwd_length = get_safe_SVAL(param,tpscnt,p+34,0,-1);
+-	if (min_pwd_length == -1) {
+-		errcode = W_ERROR_V(WERR_INVALID_PARAM);
+-		goto out;
+-	}
+-
+-	*rparam_len = 4;
+-	*rparam = smb_realloc_limit(*rparam,*rparam_len);
+-	if (!*rparam) {
+-		return False;
+-	}
+-
+-	*rdata_len = 0;
+-
+-	DEBUG(3,("Set password for <%s> (encrypted: %d, min_pwd_length: %d)\n",
+-		user, encrypted, min_pwd_length));
+-
+-	ZERO_STRUCT(connect_handle);
+-	ZERO_STRUCT(domain_handle);
+-	ZERO_STRUCT(user_handle);
+-
+-	status = rpc_pipe_open_interface(mem_ctx, &ndr_table_samr.syntax_id,
+-					conn->session_info,
+-					&conn->sconn->client_id,
+-					conn->sconn->msg_ctx,
+-					&cli);
+-	if (!NT_STATUS_IS_OK(status)) {
+-		DEBUG(0,("api_SetUserPassword: could not connect to samr: %s\n",
+-			  nt_errstr(status)));
+-		errcode = W_ERROR_V(ntstatus_to_werror(status));
+-		goto out;
+-	}
+-
+-	b = cli->binding_handle;
+-
+-	status = dcerpc_samr_Connect2(b, mem_ctx,
+-				      global_myname(),
+-				      SAMR_ACCESS_CONNECT_TO_SERVER |
+-				      SAMR_ACCESS_ENUM_DOMAINS |
+-				      SAMR_ACCESS_LOOKUP_DOMAIN,
+-				      &connect_handle,
+-				      &result);
+-	if (!NT_STATUS_IS_OK(status)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(status));
+-		goto out;
+-	}
+-	if (!NT_STATUS_IS_OK(result)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(result));
+-		goto out;
+-	}
+-
+-	init_lsa_String(&domain_name, get_global_sam_name());
+-
+-	status = dcerpc_samr_LookupDomain(b, mem_ctx,
+-					  &connect_handle,
+-					  &domain_name,
+-					  &domain_sid,
+-					  &result);
+-	if (!NT_STATUS_IS_OK(status)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(status));
+-		goto out;
+-	}
+-	if (!NT_STATUS_IS_OK(result)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(result));
+-		goto out;
+-	}
+-
+-	status = dcerpc_samr_OpenDomain(b, mem_ctx,
+-					&connect_handle,
+-					SAMR_DOMAIN_ACCESS_OPEN_ACCOUNT,
+-					domain_sid,
+-					&domain_handle,
+-					&result);
+-	if (!NT_STATUS_IS_OK(status)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(status));
+-		goto out;
+-	}
+-	if (!NT_STATUS_IS_OK(result)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(result));
+-		goto out;
+-	}
+-
+-	init_lsa_String(&names, user);
+-
+-	status = dcerpc_samr_LookupNames(b, mem_ctx,
+-					 &domain_handle,
+-					 1,
+-					 &names,
+-					 &rids,
+-					 &types,
+-					 &result);
+-	if (!NT_STATUS_IS_OK(status)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(status));
+-		goto out;
+-	}
+-	if (!NT_STATUS_IS_OK(result)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(result));
+-		goto out;
+-	}
+-
+-	if (rids.count != 1) {
+-		errcode = W_ERROR_V(WERR_NO_SUCH_USER);
+-		goto out;
+-	}
+-	if (rids.count != types.count) {
+-		errcode = W_ERROR_V(WERR_INVALID_PARAM);
+-		goto out;
+-	}
+-	if (types.ids[0] != SID_NAME_USER) {
+-		errcode = W_ERROR_V(WERR_INVALID_PARAM);
+-		goto out;
+-	}
+-
+-	rid = rids.ids[0];
+-
+-	status = dcerpc_samr_OpenUser(b, mem_ctx,
+-				      &domain_handle,
+-				      SAMR_USER_ACCESS_CHANGE_PASSWORD,
+-				      rid,
+-				      &user_handle,
+-				      &result);
+-	if (!NT_STATUS_IS_OK(status)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(status));
+-		goto out;
+-	}
+-	if (!NT_STATUS_IS_OK(result)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(result));
+-		goto out;
+-	}
+-
+-	if (encrypted == 0) {
+-		E_deshash(pass1, old_lm_hash.hash);
+-		E_deshash(pass2, new_lm_hash.hash);
+-	} else {
+-		ZERO_STRUCT(old_lm_hash);
+-		ZERO_STRUCT(new_lm_hash);
+-		memcpy(old_lm_hash.hash, pass1, MIN(strlen(pass1), 16));
+-		memcpy(new_lm_hash.hash, pass1, MIN(strlen(pass2), 16));
+-	}
+-
+-	status = dcerpc_samr_ChangePasswordUser(b, mem_ctx,
+-						&user_handle,
+-						true, /* lm_present */
+-						&old_lm_hash,
+-						&new_lm_hash,
+-						false, /* nt_present */
+-						NULL, /* old_nt_crypted */
+-						NULL, /* new_nt_crypted */
+-						false, /* cross1_present */
+-						NULL, /* nt_cross */
+-						false, /* cross2_present */
+-						NULL, /* lm_cross */
+-						&result);
+-	if (!NT_STATUS_IS_OK(status)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(status));
+-		goto out;
+-	}
+-	if (!NT_STATUS_IS_OK(result)) {
+-		errcode = W_ERROR_V(ntstatus_to_werror(result));
+-		goto out;
+-	}
+-
+-	errcode = NERR_Success;
+- out:
+-
+-	if (b && is_valid_policy_hnd(&user_handle)) {
+-		dcerpc_samr_Close(b, mem_ctx, &user_handle, &result);
+-	}
+-	if (b && is_valid_policy_hnd(&domain_handle)) {
+-		dcerpc_samr_Close(b, mem_ctx, &domain_handle, &result);
+-	}
+-	if (b && is_valid_policy_hnd(&connect_handle)) {
+-		dcerpc_samr_Close(b, mem_ctx, &connect_handle, &result);
+-	}
+-
+-	memset((char *)pass1,'\0',sizeof(fstring));
+-	memset((char *)pass2,'\0',sizeof(fstring));
+-
+-	SSVAL(*rparam,0,errcode);
+-	SSVAL(*rparam,2,0);		/* converter word */
+-	return(True);
+-}
+-
+-/****************************************************************************
+   Set the user password (SamOEM version - gets plaintext).
+ ****************************************************************************/
+ 
+@@ -5790,7 +5537,6 @@ static const struct {
+ 	{"NetServerEnum2",	RAP_NetServerEnum2,	api_RNetServerEnum2}, /* anon OK */
+ 	{"NetServerEnum3",	RAP_NetServerEnum3,	api_RNetServerEnum3}, /* anon OK */
+ 	{"WAccessGetUserPerms",RAP_WAccessGetUserPerms,api_WAccessGetUserPerms},
+-	{"SetUserPassword",	RAP_WUserPasswordSet2,	api_SetUserPassword},
+ 	{"WWkstaUserLogon",	RAP_WWkstaUserLogon,	api_WWkstaUserLogon},
+ 	{"PrintJobInfo",	RAP_WPrintJobSetInfo,	api_PrintJobInfo},
+ 	{"WPrintDriverEnum",	RAP_WPrintDriverEnum,	api_WPrintDriverEnum},
+diff --git a/source4/rpc_server/samr/samr_password.c b/source4/rpc_server/samr/samr_password.c
+index ee13a11..e618740 100644
+--- a/source4/rpc_server/samr/samr_password.c
++++ b/source4/rpc_server/samr/samr_password.c
+@@ -32,131 +32,17 @@
+ 
+ /*
+   samr_ChangePasswordUser
++
++  So old it is just not worth implementing
++  because it does not supply a plaintext and so we can't do password
++  complexity checking and cannot update all the other password hashes.
++
+ */
+ NTSTATUS dcesrv_samr_ChangePasswordUser(struct dcesrv_call_state *dce_call,
+ 					TALLOC_CTX *mem_ctx,
+ 					struct samr_ChangePasswordUser *r)
+ {
+-	struct dcesrv_handle *h;
+-	struct samr_account_state *a_state;
+-	struct ldb_context *sam_ctx;
+-	struct ldb_message **res;
+-	int ret;
+-	struct samr_Password new_lmPwdHash, new_ntPwdHash, checkHash;
+-	struct samr_Password *lm_pwd, *nt_pwd;
+-	NTSTATUS status = NT_STATUS_OK;
+-	const char * const attrs[] = { "dBCSPwd", "unicodePwd" , NULL };
+-
+-	DCESRV_PULL_HANDLE(h, r->in.user_handle, SAMR_HANDLE_USER);
+-
+-	a_state = h->data;
+-
+-	/* basic sanity checking on parameters.  Do this before any database ops */
+-	if (!r->in.lm_present || !r->in.nt_present ||
+-	    !r->in.old_lm_crypted || !r->in.new_lm_crypted ||
+-	    !r->in.old_nt_crypted || !r->in.new_nt_crypted) {
+-		/* we should really handle a change with lm not
+-		   present */
+-		return NT_STATUS_INVALID_PARAMETER_MIX;
+-	}
+-
+-	/* Connect to a SAMDB with system privileges for fetching the old pw
+-	 * hashes. */
+-	sam_ctx = samdb_connect(mem_ctx, dce_call->event_ctx,
+-				dce_call->conn->dce_ctx->lp_ctx,
+-				system_session(dce_call->conn->dce_ctx->lp_ctx), 0);
+-	if (sam_ctx == NULL) {
+-		return NT_STATUS_INVALID_SYSTEM_SERVICE;
+-	}
+-
+-	/* fetch the old hashes */
+-	ret = gendb_search_dn(sam_ctx, mem_ctx,
+-			      a_state->account_dn, &res, attrs);
+-	if (ret != 1) {
+-		return NT_STATUS_WRONG_PASSWORD;
+-	}
+-
+-	status = samdb_result_passwords(mem_ctx,
+-					dce_call->conn->dce_ctx->lp_ctx,
+-					res[0], &lm_pwd, &nt_pwd);
+-	if (!NT_STATUS_IS_OK(status) || !nt_pwd) {
+-		return NT_STATUS_WRONG_PASSWORD;
+-	}
+-
+-	/* decrypt and check the new lm hash */
+-	if (lm_pwd) {
+-		D_P16(lm_pwd->hash, r->in.new_lm_crypted->hash, new_lmPwdHash.hash);
+-		D_P16(new_lmPwdHash.hash, r->in.old_lm_crypted->hash, checkHash.hash);
+-		if (memcmp(checkHash.hash, lm_pwd, 16) != 0) {
+-			return NT_STATUS_WRONG_PASSWORD;
+-		}
+-	}
+-
+-	/* decrypt and check the new nt hash */
+-	D_P16(nt_pwd->hash, r->in.new_nt_crypted->hash, new_ntPwdHash.hash);
+-	D_P16(new_ntPwdHash.hash, r->in.old_nt_crypted->hash, checkHash.hash);
+-	if (memcmp(checkHash.hash, nt_pwd, 16) != 0) {
+-		return NT_STATUS_WRONG_PASSWORD;
+-	}
+-
+-	/* The NT Cross is not required by Win2k3 R2, but if present
+-	   check the nt cross hash */
+-	if (r->in.cross1_present && r->in.nt_cross && lm_pwd) {
+-		D_P16(lm_pwd->hash, r->in.nt_cross->hash, checkHash.hash);
+-		if (memcmp(checkHash.hash, new_ntPwdHash.hash, 16) != 0) {
+-			return NT_STATUS_WRONG_PASSWORD;
+-		}
+-	}
+-
+-	/* The LM Cross is not required by Win2k3 R2, but if present
+-	   check the lm cross hash */
+-	if (r->in.cross2_present && r->in.lm_cross && lm_pwd) {
+-		D_P16(nt_pwd->hash, r->in.lm_cross->hash, checkHash.hash);
+-		if (memcmp(checkHash.hash, new_lmPwdHash.hash, 16) != 0) {
+-			return NT_STATUS_WRONG_PASSWORD;
+-		}
+-	}
+-
+-	/* Start a SAM with user privileges for the password change */
+-	sam_ctx = samdb_connect(mem_ctx, dce_call->event_ctx,
+-				dce_call->conn->dce_ctx->lp_ctx,
+-				dce_call->conn->auth_state.session_info, 0);
+-	if (sam_ctx == NULL) {
+-		return NT_STATUS_INVALID_SYSTEM_SERVICE;
+-	}
+-
+-	/* Start transaction */
+-	ret = ldb_transaction_start(sam_ctx);
+-	if (ret != LDB_SUCCESS) {
+-		DEBUG(1, ("Failed to start transaction: %s\n", ldb_errstring(sam_ctx)));
+-		return NT_STATUS_TRANSACTION_ABORTED;
+-	}
+-
+-	/* Performs the password modification. We pass the old hashes read out
+-	 * from the database since they were already checked against the user-
+-	 * provided ones. */
+-	status = samdb_set_password(sam_ctx, mem_ctx,
+-				    a_state->account_dn,
+-				    a_state->domain_state->domain_dn,
+-				    NULL, &new_lmPwdHash, &new_ntPwdHash,
+-				    lm_pwd, nt_pwd, /* this is a user password change */
+-				    NULL,
+-				    NULL);
+-	if (!NT_STATUS_IS_OK(status)) {
+-		ldb_transaction_cancel(sam_ctx);
+-		return status;
+-	}
+-
+-	/* And this confirms it in a transaction commit */
+-	ret = ldb_transaction_commit(sam_ctx);
+-	if (ret != LDB_SUCCESS) {
+-		DEBUG(1,("Failed to commit transaction to change password on %s: %s\n",
+-			 ldb_dn_get_linearized(a_state->account_dn),
+-			 ldb_errstring(sam_ctx)));
+-		return NT_STATUS_TRANSACTION_ABORTED;
+-	}
+-
+-	return NT_STATUS_OK;
++	return NT_STATUS_NOT_IMPLEMENTED;
+ }
+ 
+ /*
+diff --git a/source4/torture/rpc/samr.c b/source4/torture/rpc/samr.c
+index 7d9a1e2..adfc5d4 100644
+--- a/source4/torture/rpc/samr.c
++++ b/source4/torture/rpc/samr.c
+@@ -1728,8 +1728,16 @@ static bool test_ChangePasswordUser(struct dcerpc_binding_handle *b,
+ 
+ 	torture_assert_ntstatus_ok(tctx, dcerpc_samr_ChangePasswordUser_r(b, tctx, &r),
+ 		"ChangePasswordUser failed");
+-	torture_assert_ntstatus_equal(tctx, r.out.result, NT_STATUS_WRONG_PASSWORD,
+-		"ChangePasswordUser failed: expected NT_STATUS_WRONG_PASSWORD because we broke the LM hash");
++
++	/* Do not proceed if this call has been removed */
++	if (NT_STATUS_EQUAL(r.out.result, NT_STATUS_NOT_IMPLEMENTED)) {
++		return true;
++	}
++
++	if (!NT_STATUS_EQUAL(r.out.result, NT_STATUS_PASSWORD_RESTRICTION)) {
++		torture_assert_ntstatus_equal(tctx, r.out.result, NT_STATUS_WRONG_PASSWORD,
++			"ChangePasswordUser failed: expected NT_STATUS_WRONG_PASSWORD because we broke the LM hash");
++	}
+ 
+ 	/* Unbreak the LM hash */
+ 	hash1.hash[0]--;
+-- 
+1.7.9.5
+
diff --git a/meta-oe/recipes-connectivity/samba/samba_3.6.8.bb b/meta-oe/recipes-connectivity/samba/samba_3.6.8.bb
index 20b609de5f..f80e41ed01 100644
--- a/meta-oe/recipes-connectivity/samba/samba_3.6.8.bb
+++ b/meta-oe/recipes-connectivity/samba/samba_3.6.8.bb
@@ -30,6 +30,7 @@ SRC_URI += "\
     file://configure-disable-getaddrinfo-cross.patch;patchdir=.. \
     file://configure-disable-core_pattern-cross-check.patch;patchdir=.. \
     file://configure-libunwind.patch;patchdir=.. \
+    file://samba-3.6.22-CVE-2013-4496.patch;patchdir=.. \
 "
 SRC_URI[md5sum] = "fbb245863eeef2fffe172df779a217be"
 SRC_URI[sha256sum] = "4f5a171a8d902c6b4f822ed875c51eb8339196d9ccf0ecd7f6521c966b3514de"