CIS compliance (sysctl, limits)
* CIS 1.5.1 Ensure core dumps are restricted
* CIS 1.5.3 Ensure address space layout randomization (ASLR) is enabled
* CIS 3.1.2 Ensure packet redirect sending is disabled
* CIS 3.2.1 Ensure source routed packets are not accepted
* CIS 3.2.2 Ensure ICMP redirects are not accepted
* CIS 3.2.3 Ensure secure ICMP redirects are not accepted
* CIS 3.2.4 Ensure suspicious packets are logged
* CIS 3.2.5 Ensure broadcast ICMP requests are ignored
* CIS 3.2.6 Ensure bogus ICMP responses are ignored
* CIS 3.2.7 Ensure Reverse Path Filtering is enabled
* CIS 3.2.8 Ensure TCP SYN Cookies is enabled
All sysctls are valid for Ubuntu 14.04, Ubuntu 16.04.
Change-Id: I48f34c55d97a78c253d4810db46b2a04ff5c0c1a
diff --git a/metadata/service/system/cis/cis-3-2-3.yml b/metadata/service/system/cis/cis-3-2-3.yml
new file mode 100644
index 0000000..fcb90ee
--- /dev/null
+++ b/metadata/service/system/cis/cis-3-2-3.yml
@@ -0,0 +1,45 @@
+# 3.2.3 Ensure secure ICMP redirects are not accepted
+#
+# Description
+# ===========
+# Secure ICMP redirects are the same as ICMP redirects, except they come from
+# gateways listed on the default gateway list. It is assumed that these
+# gateways are known to your system, and that they are likely to be secure.
+#
+# Rationale
+# =========
+# It is still possible for even known gateways to be compromised. Setting
+# net.ipv4.conf.all.secure_redirects to 0 protects the system from routing
+# table updates by possibly compromised known gateways.
+#
+# Audit
+# =====
+#
+# Run the following commands and verify output matches:
+#
+# # sysctl net.ipv4.conf.all.secure_redirects
+# net.ipv4.conf.all.secure_redirects = 0
+# # sysctl net.ipv4.conf.default.secure_redirects
+# net.ipv4.conf.default.secure_redirects = 0
+#
+# Remediation
+# ===========
+#
+# Set the following parameters in the /etc/sysctl.conf file:
+#
+# net.ipv4.conf.all.secure_redirects = 0
+# net.ipv4.conf.default.secure_redirects = 0
+#
+# Run the following commands to set the active kernel parameters:
+#
+# # sysctl -w net.ipv4.conf.all.secure_redirects=0
+# # sysctl -w net.ipv4.conf.default.secure_redirects=0
+# # sysctl -w net.ipv4.route.flush=1
+
+parameters:
+ linux:
+ system:
+ kernel:
+ sysctl:
+ net.ipv4.conf.all.secure_redirects: 0
+ net.ipv4.conf.default.secure_redirects: 0