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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
Basé sur la classification professionnelle SOC
Affichage de SKILL.md
| name | cis-ubuntu1804-v220-1-1-1-1 |
| description | Ensure mounting of cramfs filesystems is disabled |
| category | cis-storage |
| version | 2.2.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-18.04","filesystem","cramfs","kernel-module"] |
| cis_id | 1.1.1.1 |
| cis_benchmark | CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Level 1 - Server / Level 1 - Workstation, Assessment: Automated
The cramfs filesystem type is a compressed read-only Linux filesystem embedded in small footprint systems. A cramfs image can be used without having to first decompress the image.
Removing support for unneeded filesystem types reduces the local attack surface of the system. If this filesystem type is not needed, disable it.
None noted.
Run the following script to verify the cramfs module is disabled:
#!/usr/bin/env bash
{
l_output="" l_output2="" l_output3="" l_dl="" # Unset output variables
l_mname="cramfs" # set module name
l_mtype="fs" # set module type
l_searchloc="/lib/modprobe.d/*.conf /usr/local/lib/modprobe.d/*.conf /run/modprobe.d/*.conf /etc/modprobe.d/*.conf"
l_mpath="/lib/modules/**/kernel/$l_mtype"
l_mpname="$(tr '-' ' ' <<< "$l_mname")"
l_mndir="$(tr '-' '/' <<< "$l_mname")"
module_loadable_chk()
{
# Check if the module is currently loadable
l_loadable="$(modprobe -n -v "$l_mname")"
[ "$(wc -l <<< "$l_loadable")" -gt "1" ] && l_loadable="$(grep -P -- "(^\h*install|\b$l_mname)\b" <<< )"
grep -Pq -- <<< ;
l_output=
l_output2=
}
()
{
! lsmod | grep > /dev/null 2>&1;
l_output=
l_output2=
}
()
{
l_dl=
modprobe --showconfig | grep -Pq -- ;
l_output=
l_output2=
}
l_mdir ;
[ -d ] && [ -n ];
l_output3=
[ != ] && module_deny_chk
[ = ];
module_loadable_chk
module_loaded_chk
l_output=
[ -n ] && -e
[ -z ];
-e
-e
[ -n ] && -e
}
Run the following script to disable the cramfs module:
#!/usr/bin/env bash
{
l_mname="cramfs" # set module name
l_mtype="fs" # set module type
l_mpath="/lib/modules/**/kernel/$l_mtype"
l_mpname="$(tr '-' ' ' <<< "$l_mname")"
l_mndir="$(tr '-' '/' <<< "$l_mname")"
module_loadable_fix()
{
# If the module is currently loadable, add "install {MODULE_NAME} /bin/false" to a file in "/etc/modprobe.d"
l_loadable="$(modprobe -n -v "$l_mname")"
[ "$(wc -l <<< "$l_loadable")" -gt "1" ] && l_loadable="$(grep -P -- "(^\h*install|\b$l_mname)\b" <<< "$l_loadable")"
if ! grep -Pq -- '^\h*install \/bin\/(true|false)' <<< "$l_loadable"; then
echo -e "\n - setting module: \"$l_mname\" to be not loadable"
echo -e "install $l_mname /bin/false" >> /etc/modprobe.d/"$l_mpname".conf
fi
}
module_loaded_fix()
{
# If the module is currently loaded, unload the module
if lsmod | grep "$l_mname" > /dev/null 2>&1; then
echo -e "\n - unloading module \"$l_mname\""
modprobe -r "$l_mname"
fi
}
module_deny_fix()
{
# If the module isn't deny listed, denylist the module
if ! modprobe --showconfig | grep -Pq -- "^\h*blacklist\h+$l_mpname\b"; then
echo -e "\n - deny listing \"$l_mname\""
echo -e "blacklist $l_mname" >> /etc/modprobe.d/"$l_mpname".conf
fi
}
# Check if the module exists on the system
for l_mdir in $l_mpath; do
if [ -d "$l_mdir/$l_mndir" ] && [ -n "$(ls -A $l_mdir/$l_mndir)" ]; then
echo -e "\n - module: \"$l_mname\" exists in \"$l_mdir\"\n - checking if disabled..."
module_deny_fix
if [ "$l_mdir" = "/lib/modules/$(uname -r)/kernel/$l_mtype" ]; then
module_loadable_fix
module_loaded_fix
fi
else
echo -e "\n - module: \"$l_mname\" doesn't exist in \"$l_mdir\"\n"
fi
done
echo -e "\n - remediation of module: \"$l_mname\" complete\n"
}
Not disabled by default.
v8 - 4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software (IG 2, IG 3) v7 - 9.2 Ensure Only Approved Ports, Protocols and Services Are Running (IG 2, IG 3)
MITRE ATT&CK Mappings: T1005, T1005.000 (TA0005) - M1050