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Patrick Schleizer 2019-12-06 09:30:05 -05:00
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@ -26,8 +26,9 @@ very useful for kernel exploits.
* The TCP/IP stack is hardened by disabling ICMP redirect acceptance,
ICMP redirect sending and source routing to prevent man-in-the-middle attacks,
ignoring all ICMP requests, enabling TCP syncookies to prevent SYN flood
attacks and enabling RFC1337 to protect against time-wait assassination
attacks.
attacks, enabling RFC1337 to protect against time-wait assassination
attacks and enabling reverse path filtering to prevent IP spoofing and
mitigate vulnerabilities such as CVE-2019-14899.
* Some data spoofing attacks are made harder.
@ -86,6 +87,13 @@ Improve Entropy Collection
* Load jitterentropy_rng kernel module.
/usr/lib/modules-load.d/30_security-misc.conf
* Distrusts the CPU for initial entropy at boot as it is not possible to
audit, may contain weaknesses or a backdoor.
* https://en.wikipedia.org/wiki/RDRAND#Reception
* https://twitter.com/pid_eins/status/1149649806056280069
* For more references, see:
* /etc/default/grub.d/40_distrust_cpu.cfg
Uncommon network protocols are blacklisted:
These are rarely used and may have unknown vulnerabilities.
/etc/modprobe.d/uncommon-network-protocols.conf
@ -111,6 +119,12 @@ The network protocols that are blacklisted are:
user restrictions:
* remount /home, /tmp, /dev/shm and /run with nosuid,nodev (default) and
noexec (opt-in). To disable this, run "sudo touch /etc/remount-disable". To
opt-in noexec, run "sudo touch /etc/noexec" and reboot (easiest).
/lib/systemd/system/remount-secure.service
/usr/lib/security-misc/remount-secure
* A systemd service mounts /proc with hidepid=2 at boot to prevent users from
seeing each other's processes.