samba: fix CVE-2023-42669 denial of service

Upstream-Status: Backport from https://www.samba.org/samba/ftp/patches/security/samba-4.17.12-security-2023-10-10.patch

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

2 files changed, 94 insertions, 0 deletions

diff --git a/meta-networking/recipes-connectivity/samba/samba/CVE-2023-42669.patch b/meta-networking/recipes-connectivity/samba/samba/CVE-2023-42669.patch
new file mode 100644
index 000000000..0d1cbe5ad
--- /dev/null
+++ b/meta-networking/recipes-connectivity/samba/samba/CVE-2023-42669.patch
@@ -0,0 +1,93 @@
+From 3f62a590b02bf4c888a995017e2575d3b2ec6ac9 Mon Sep 17 00:00:00 2001
+From: Andrew Bartlett <abartlet@samba.org>
+Date: Tue, 12 Sep 2023 18:59:44 +1200
+Subject: [PATCH] CVE-2023-42669 s4-rpc_server: Disable rpcecho server by
+ default
+
+The rpcecho server is useful in development and testing, but should never
+have been allowed into production, as it includes the facility to
+do a blocking sleep() in the single-threaded rpc worker.
+
+BUG: https://bugzilla.samba.org/show_bug.cgi?id=15474
+
+Signed-off-by: Andrew Bartlett <abartlet@samba.org>
+
+Upstream-Status: Backport [https://www.samba.org/samba/ftp/patches/security/samba-4.17.12-security-2023-10-10.patch]
+CVE: CVE-2023-42669
+Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
+---
+ docs-xml/smbdotconf/protocol/dcerpcendpointservers.xml | 2 +-
+ lib/param/loadparm.c                                   | 2 +-
+ selftest/target/Samba4.pm                              | 2 +-
+ source3/param/loadparm.c                               | 2 +-
+ source4/rpc_server/wscript_build                       | 3 ++-
+ 5 files changed, 6 insertions(+), 5 deletions(-)
+
+diff --git a/docs-xml/smbdotconf/protocol/dcerpcendpointservers.xml b/docs-xml/smbdotconf/protocol/dcerpcendpointservers.xml
+index 8a217cc..c6642b7 100644
+--- a/docs-xml/smbdotconf/protocol/dcerpcendpointservers.xml
++++ b/docs-xml/smbdotconf/protocol/dcerpcendpointservers.xml
+@@ -6,6 +6,6 @@
+        <para>Specifies which DCE/RPC endpoint servers should be run.</para>
+ </description>
+ 
+-<value type="default">epmapper, wkssvc, rpcecho, samr, netlogon, lsarpc, drsuapi, dssetup, unixinfo, browser, eventlog6, backupkey, dnsserver</value>
++<value type="default">epmapper, wkssvc, samr, netlogon, lsarpc, drsuapi, dssetup, unixinfo, browser, eventlog6, backupkey, dnsserver</value>
+ <value type="example">rpcecho</value>
+ </samba:parameter>
+diff --git a/lib/param/loadparm.c b/lib/param/loadparm.c
+index 4c3dfff..db4ae5e 100644
+--- a/lib/param/loadparm.c
++++ b/lib/param/loadparm.c
+@@ -2653,7 +2653,7 @@ struct loadparm_context *loadparm_init(TALLOC_CTX *mem_ctx)
+        lpcfg_do_global_parameter(lp_ctx, "ntvfs handler", "unixuid default");
+        lpcfg_do_global_parameter(lp_ctx, "max connections", "0");
+ 
+-       lpcfg_do_global_parameter(lp_ctx, "dcerpc endpoint servers", "epmapper wkssvc rpcecho samr netlogon lsarpc drsuapi dssetup unixinfo browser eventlog6 backupkey dnsserver");
++       lpcfg_do_global_parameter(lp_ctx, "dcerpc endpoint servers", "epmapper wkssvc samr netlogon lsarpc drsuapi dssetup unixinfo browser eventlog6 backupkey dnsserver");
+        lpcfg_do_global_parameter(lp_ctx, "server services", "s3fs rpc nbt wrepl ldap cldap kdc drepl winbindd ntp_signd kcc dnsupdate dns");
+        lpcfg_do_global_parameter(lp_ctx, "kccsrv:samba_kcc", "true");
+        /* the winbind method for domain controllers is for both RODC
+diff --git a/selftest/target/Samba4.pm b/selftest/target/Samba4.pm
+index a7a6c4c..ffa4b95 100755
+--- a/selftest/target/Samba4.pm
++++ b/selftest/target/Samba4.pm
+@@ -773,7 +773,7 @@ sub provision_raw_step1($$)
+        wins support = yes
+        server role = $ctx->{server_role}
+        server services = +echo $services
+-        dcerpc endpoint servers = +winreg +srvsvc
++        dcerpc endpoint servers = +winreg +srvsvc +rpcecho
+        notify:inotify = false
+        ldb:nosync = true
+        ldap server require strong auth = yes
+diff --git a/source3/param/loadparm.c b/source3/param/loadparm.c
+index 0db44e9..b052d42 100644
+--- a/source3/param/loadparm.c
++++ b/source3/param/loadparm.c
+@@ -877,7 +877,7 @@ static void init_globals(struct loadparm_context *lp_ctx, bool reinit_globals)
+ 
+        Globals.server_services = str_list_make_v3_const(NULL, "s3fs rpc nbt wrepl ldap cldap kdc drepl winbindd ntp_signd kcc dnsupdate dns", NULL);
+ 
+-       Globals.dcerpc_endpoint_servers = str_list_make_v3_const(NULL, "epmapper wkssvc rpcecho samr netlogon lsarpc drsuapi dssetup unixinfo browser eventlog6 backupkey dnsserver", NULL);
++       Globals.dcerpc_endpoint_servers = str_list_make_v3_const(NULL, "epmapper wkssvc samr netlogon lsarpc drsuapi dssetup unixinfo browser eventlog6 backupkey dnsserver", NULL);
+ 
+        Globals.tls_enabled = true;
+        Globals.tls_verify_peer = TLS_VERIFY_PEER_AS_STRICT_AS_POSSIBLE;
+diff --git a/source4/rpc_server/wscript_build b/source4/rpc_server/wscript_build
+index 510335a..a95e070 100644
+--- a/source4/rpc_server/wscript_build
++++ b/source4/rpc_server/wscript_build
+@@ -36,7 +36,8 @@ bld.SAMBA_MODULE('dcerpc_rpcecho',
+        source='echo/rpc_echo.c',
+        subsystem='dcerpc_server',
+        init_function='dcerpc_server_rpcecho_init',
+-       deps='ndr-standard events'
++        deps='ndr-standard events',
++        enabled=bld.CONFIG_GET('ENABLE_SELFTEST')
+        )
+ 
+ 
+-- 
+2.25.1
+
diff --git a/meta-networking/recipes-connectivity/samba/samba_4.10.18.bb b/meta-networking/recipes-connectivity/samba/samba_4.10.18.bb
index d7b586471..3b8da2b1c 100644
--- a/meta-networking/recipes-connectivity/samba/samba_4.10.18.bb
+++ b/meta-networking/recipes-connectivity/samba/samba_4.10.18.bb
@@ -30,6 +30,7 @@ SRC_URI = "${SAMBA_MIRROR}/stable/samba-${PV}.tar.gz \
            file://0001-nsswitch-nsstest.c-Avoid-nss-function-conflicts-with.patch \
            file://CVE-2020-14318.patch \
            file://CVE-2020-14383.patch \
+           file://CVE-2023-42669.patch \
            "
 SRC_URI_append_libc-musl = " \
            file://samba-pam.patch \