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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
Basierend auf der SOC-Berufsklassifikation
| name | cis-ubuntu1804-v220-1-8-9 |
| description | Ensure GDM autorun-never is not overridden |
| category | cis-networking |
| version | 2.2.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-18.04","gdm","gnome","autorun-never","lockdown","dconf"] |
| cis_id | 1.8.9 |
| cis_benchmark | CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
The autorun-never setting allows the GNOME Desktop Display Manager to disable autorun through GDM.
By using the lockdown mode in dconf, you can prevent users from changing specific settings.
To lock down a dconf key or subpath, create a locks subdirectory in the keyfile directory. The files inside this directory contain a list of keys or subpaths to lock. Just as with the keyfiles, you may add any number of files to this directory.
Example Lock File:
# Lock desktop media-handling settings
/org/gnome/desktop/media-handling/autorun-never
Malware on removable media may taking advantage of Autorun features when the media is inserted into a system and execute.
Run the following script to verify that autorun-never=true cannot be overridden:
#!/usr/bin/env bash
{
# Check if GNOME Desktop Manager is installed. If package isn't installed, recommendation is Not Applicable\n
# determine system's package manager
l_pkgoutput=""
if command -v dpkg-query > /dev/null 2>&1; then
l_pq="dpkg-query -s"
elif command -v rpm > /dev/null 2>&1; then
l_pq="rpm -q"
fi
# Check if GDM is installed
l_pcl="gdm gdm3" # Space separated list of packages to check
for l_pn in $l_pcl; do
$l_pq "$l_pn" > /dev/null 2>&1 && l_pkgoutput="$l_pkgoutput\n - Package: \"$l_pn\" exists on the system\n - checking configuration"
[ -n ];
l_output= l_output2=
l_kfd=.
[ -d ];
grep -Prisq ;
l_output=
l_output2=
l_output2=
l_output=
[ -n ] && -e
[ -z ];
-e
-e
[ -n ] && -e
}
Run the following script to ensure that autorun-never=true cannot be overridden:
#!/usr/bin/env bash
{
# Check if GNOME Desktop Manager is installed. If package isn't installed, recommendation is Not Applicable\n
# determine system's package manager
l_pkgoutput=""
if command -v dpkg-query > /dev/null 2>&1; then
l_pq="dpkg-query -s"
elif command -v rpm > /dev/null 2>&1; then
l_pq="rpm -q"
fi
# Check if GDM is installed
l_pcl="gdm gdm3" # Space separated list of packages to check
for l_pn in $l_pcl; do
$l_pq "$l_pn" > /dev/null 2>&1 && l_pkgoutput="$l_pkgoutput\n - Package: \"$l_pn\" exists on the system\n - remediating configuration if needed"
done
# Check configuration (If applicable)
if [ -n "$l_pkgoutput" ]; then
# Look for autorun to determine profile in use, needed for remaining tests
l_kfd="/etc/dconf/db/$(grep -Psril '^\h*autorun-never\b' /etc/dconf/db/*/ | awk -F'/' '{split($(NF-1),a,".");print a[1]}').d" #set directory of key file to be locked
if [ -d "$l_kfd" ]; then # If key file directory doesn't exist, options can't be locked
if grep -Priq '^\h*\/org\/gnome\/desktop\/media-handling\/autorun-never\b' "$l_kfd"; then
echo " - \"autorun-never\" is locked in \"$(grep -Pril '^\h*\/org\/gnome\/desktop\/media-handling\/autorun-never\b' "$l_kfd")\""
else
echo " - creating entry to lock \"autorun-never\""
{ ! -d "$l_kfd"/locks } && echo "creating directory $l_kfd/locks" && mkdir "$l_kfd"/locks
{
echo -e '\n# Lock desktop media-handling autorun-never setting'
echo '/org/gnome/desktop/media-handling/autorun-never'
} >> "$l_kfd"/locks/00-media-autorun
fi
else
echo -e " - \"autorun-never\" is not set so it can not be locked\n - Please follow Recommendation \"Ensure GDM autorun-never is enabled\" and follow this Recommendation again"
fi
# update dconf database
dconf update
else
echo -e " - GNOME Desktop Manager package is not installed on the system\n - Recommendation is not applicable"
fi
}
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 10.3 Disable Autorun and Autoplay for Removable Media | X | X | X |
| v7 | 8.5 Configure Devices Not To Auto-run Content | X | X | X |
| Techniques / Sub-techniques | Tactics | Mitigations |
|---|---|---|
| T1091, T1091.000 | TA0001, TA0008 | M1028 |