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macOS post-exploitation for credential harvesting, DTrace monitoring, TCC bypass, and stealth operations via native tools
Windows userland post-exploitation for credential harvesting, monitoring, AMSI/ETW bypass, and stealth operations
Kubernetes post-exploitation for container escape, secret extraction, RBAC abuse, and cluster persistence
| name | cis-ubuntu2004-v300-3-3-11 |
| description | Ensure ipv6 router advertisements are not accepted |
| category | cis-networking |
| version | 3.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-20.04","kernel-parameter"] |
| cis_id | 3.3.11 |
| cis_benchmark | CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Routers periodically multicast Router Advertisement messages to announce their availability and convey information to neighboring nodes that enable them to be automatically configured on the network.
net.ipv6.conf.all.accept_ra and net.ipv6.conf.default.accept_ra determine the systems ability to accept these advertisements.
It is recommended that systems do not accept router advertisements as they could be tricked into routing traffic to compromised machines. Setting hard routes within the system (usually a single default route to a trusted router) protects the system from bad routes. Setting net.ipv6.conf.all.accept_ra and net.ipv6.conf.default.accept_ra to 0 disables the system's ability to accept IPv6 router advertisements.
None expected.
Run the following script to verify the following kernel parameters are set in the running configuration and correctly loaded from a kernel parameter configuration file:
net.ipv6.conf.all.accept_ra is set to 0net.ipv6.conf.default.accept_ra is set to 0Note:
Audit Result: ** PASS ** with both net.ipv6.conf.all.accept_ra and net.ipv6.conf.default.accept_ra set to 0 (or IPv6 disabled on the system).
IF - IPv6 is enabled on the system:
Set the following parameters in /etc/sysctl.conf or a file in /etc/sysctl.d/ ending in .conf:
net.ipv6.conf.all.accept_ra = 0
net.ipv6.conf.default.accept_ra = 0
Example:
# printf '%s\n' "net.ipv6.conf.all.accept_ra = 0" "net.ipv6.conf.default.accept_ra = 0" >> /etc/sysctl.d/60-
netipv6_sysctl.conf
Run the following script to set the active kernel parameters:
#!/usr/bin/env bash
{
sysctl -w net.ipv6.conf.all.accept_ra=0
sysctl -w net.ipv6.conf.default.accept_ra=0
sysctl -w net.ipv6.route.flush=1
}
Note: If these settings appear in a canonically later file, or later in the same file, these settings will be overwritten.
net.ipv6.conf.all.accept_ra = 1
net.ipv6.conf.default.accept_ra = 1
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software | x | x | |
| v7 | 9.2 Ensure Only Approved Ports, Protocols and Services Are Running | x | x |