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Merge remote-tracking branch 'raja/bad_ipv6_ra' into arraybolt3/trixie

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Aaron Rainbolt 2025-10-15 19:01:08 -05:00
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5
README.md
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@ -124,8 +124,9 @@ configuration file and significant hardening is applied to a myriad of component
- Disable source routing which allows users to redirect network traffic that
can result in man-in-the-middle attacks.
- Do not accept IPv6 router advertisements and solicitations.
- Do not accept IPv6 router advertisements (RAs) and solicitations which can result
in both man-in-the-middle and denial-of-service attacks.
- Optional - Disable SACK and DSACK as they have historically been a known
vector for exploitation.

10
usr/lib/sysctl.d/990-security-misc.conf#security-misc-shared
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@ -521,7 +521,15 @@ net.ipv4.icmp_ignore_bogus_error_responses=1
net.ipv4.conf.*.accept_source_route=0
net.ipv6.conf.*.accept_source_route=0
## Do not accept IPv6 router advertisements and solicitations.
## Do not accept IPv6 router advertisements (RAs) and solicitations.
## RAs are unsecured and unauthenticated and any device on the local link can send and accept them without verification.
## Malicious RAs can activate IPv6 connectivity on dormant hosts leading to unauthorized access.
## Flooding the network with malicious RAs can lead to denial of service attacks.
## Rogue RAs can lead to interception of all network traffic by setting the attacker's system as the default gateway.
##
## https://datatracker.ietf.org/doc/html/rfc6104
## https://datatracker.ietf.org/doc/html/rfc6105
## https://archive.conference.hitb.org/hitbsecconf2012kul/materials/D1T2%20-%20Marc%20Heuse%20-%20IPv6%20Insecurity%20Revolutions.pdf
##
net.ipv6.conf.*.accept_ra=0