[Buildroot] [PATCH 1/1] package/keepalived: fix CVE-2021-44225

[Fabrice Fontaine]

In Keepalived through 2.2.4, the D-Bus policy does not sufficiently
restrict the message destination, allowing any user to inspect and
manipulate any property. This leads to access-control bypass in some
situations in which an unrelated D-Bus system service has a settable
(writable) property

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
---
 ...us-fix-policy-to-not-be-overly-broad.patch | 42 +++++++++++++++++++
 package/keepalived/keepalived.mk              |  3 ++
 2 files changed, 45 insertions(+)
 create mode 100644 package/keepalived/0002-dbus-fix-policy-to-not-be-overly-broad.patch

diff --git a/package/keepalived/0002-dbus-fix-policy-to-not-be-overly-broad.patch b/package/keepalived/0002-dbus-fix-policy-to-not-be-overly-broad.patch
new file mode 100644
index 0000000000..6287d6117d
--- /dev/null
+++ b/package/keepalived/0002-dbus-fix-policy-to-not-be-overly-broad.patch
@@ -0,0 +1,42 @@
+From 7977fec0be89ae6fe87405b3f8da2f0b5e415e3d Mon Sep 17 00:00:00 2001
+From: Vincent Bernat <vincent at bernat.ch>
+Date: Tue, 23 Nov 2021 06:50:59 +0100
+Subject: [PATCH] dbus: fix policy to not be overly broad
+
+The DBus policy did not restrict the message destination, allowing any
+user to inspect and manipulate any property.
+
+Signed-off-by: Vincent Bernat <vincent at bernat.ch>
+
+[Retrieved from:
+https://github.com/acassen/keepalived/commit/7977fec0be89ae6fe87405b3f8da2f0b5e415e3d]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
+---
+ keepalived/dbus/org.keepalived.Vrrp1.conf | 13 ++++++++-----
+ 1 file changed, 8 insertions(+), 5 deletions(-)
+
+diff --git a/keepalived/dbus/org.keepalived.Vrrp1.conf b/keepalived/dbus/org.keepalived.Vrrp1.conf
+index 2b78a575c..b5ced6085 100644
+--- a/keepalived/dbus/org.keepalived.Vrrp1.conf
++++ b/keepalived/dbus/org.keepalived.Vrrp1.conf
+@@ -3,12 +3,15 @@
+  "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+ <busconfig>
+ 	<policy user="root">
+-		<allow own="org.keepalived.Vrrp1"/>
+-		<allow send_destination="org.keepalived.Vrrp1"/>
++		<allow own="org.keepalived.Vrrp1" />
++		<allow send_destination="org.keepalived.Vrrp1" />
+ 	</policy>
+ 	<policy context="default">
+-		<allow send_interface="org.freedesktop.DBus.Introspectable" />
+-		<allow send_interface="org.freedesktop.DBus.Peer" />
+-		<allow send_interface="org.freedesktop.DBus.Properties" />
++		<allow send_destination="org.keepalived.Vrrp1"
++		       send_interface="org.freedesktop.DBus.Introspectable" />
++		<allow send_destination="org.keepalived.Vrrp1"
++		       send_interface="org.freedesktop.DBus.Peer" />
++		<allow send_destination="org.keepalived.Vrrp1"
++		       send_interface="org.freedesktop.DBus.Properties" />
+ 	</policy>
+ </busconfig>
diff --git a/package/keepalived/keepalived.mk b/package/keepalived/keepalived.mk
index 5d42cab741..e31c02dec5 100644
--- a/package/keepalived/keepalived.mk
+++ b/package/keepalived/keepalived.mk
@@ -12,6 +12,9 @@ KEEPALIVED_LICENSE_FILES = COPYING
 KEEPALIVED_CPE_ID_VENDOR = keepalived
 KEEPALIVED_CONF_OPTS = --disable-hardening
 
+# 0002-dbus-fix-policy-to-not-be-overly-broad.patch
+KEEPALIVED_IGNORE_CVES += CVE-2021-44225
+
 ifeq ($(BR2_PACKAGE_JSON_C),y)
 KEEPALIVED_DEPENDENCIES += json-c
 KEEPALIVED_CONF_OPTS += --enable-json
-- 
2.33.0