From 93861a9714f689e597efb5d11030cbc996148b90 Mon Sep 17 00:00:00 2001 From: Christian Pointner Date: Tue, 18 Jun 2019 22:27:34 +0200 Subject: disable TCP Sack --- roles/base/vars/main.yml | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'roles/base/vars') diff --git a/roles/base/vars/main.yml b/roles/base/vars/main.yml index 557a4a7c..d228b088 100644 --- a/roles/base/vars/main.yml +++ b/roles/base/vars/main.yml @@ -43,3 +43,8 @@ sysctl_config: # Prevent against the common 'syn flood attack' net.ipv4.tcp_syncookies: 1 + + # Disable Selective Acknowledgement (SACK) + # Workaround CVE-2019-11477, CVE-2019-11478, CVE-2019-11479 + # See https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md + net.ipv4.tcp_sack: 0 -- cgit v1.2.3