From 30289c68c24a8aa2ce5f336b79f92cffb7aa98c7 Mon Sep 17 00:00:00 2001
From: madaidan <50278627+madaidan@users.noreply.github.com>
Date: Thu, 5 Dec 2019 20:13:10 +0000
Subject: [PATCH] Enable reverse path filtering

---
 etc/sysctl.d/tcp_hardening.conf | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/etc/sysctl.d/tcp_hardening.conf b/etc/sysctl.d/tcp_hardening.conf
index 699fafb..7174c2d 100644
--- a/etc/sysctl.d/tcp_hardening.conf
+++ b/etc/sysctl.d/tcp_hardening.conf
@@ -33,4 +33,9 @@ net.ipv4.tcp_syncookies=1
 net.ipv4.conf.all.accept_source_route=0
 net.ipv4.conf.default.accept_source_route=0
 
+## Enable reverse path filtering to prevent IP spoofing and
+## mitigate vulnerabilities such as CVE-2019-14899.
+net.ipv4.conf.default.rp_filter=1
+net.ipv4.conf.all.rp_filter=1
+
 #### meta end