Detections
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1.7.8 Ensure GDM autorun-never is enabled

Warning! Audit Deprecated

This audit has been deprecated and will be removed in a future update.

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Information

The autorun-never setting allows the GNOME Desktop Display Manager to disable autorun through GDM.

Malware on removable media may taking advantage of Autorun features when the media is inserted into a system and execute.

Solution

- IF - GDM is installed:

Run the following script to set autorun-never to true for GDM users:

#!/usr/bin/env bash

{
 l_pkgoutput="" l_output="" l_output2=""
 l_gpname="local" # Set to desired dconf profile name (default is local)
 # Check if GNOME Desktop Manager is installed. If package isn't installed, recommendation is Not Applicable\n
 # determine system's package manager
 if command -v dpkg-query &> /dev/null; then
 l_pq="dpkg-query -s"
 elif command -v rpm &> /dev/null; 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 && l_pkgoutput="$l_pkgoutput\n - Package: \"$l_pn\" exists on the system\n - checking configuration"
 done
 echo -e "$l_pkgoutput"
 # Check configuration (If applicable)
 if [ -n "$l_pkgoutput" ]; then
 echo -e "$l_pkgoutput"
 # Look for existing settings and set variables if they exist
 l_kfile="$(grep -Prils -- '^\h*autorun-never\b' /etc/dconf/db/*.d)"
 # Set profile name based on dconf db directory ({PROFILE_NAME}.d)
 if [ -f "$l_kfile" ]; then
 l_gpname="$(awk -F\/ '{split($(NF-1),a,".");print a[1]}' <<< "$l_kfile")"
 echo " - updating dconf profile name to \"$l_gpname\""
 fi
 [ ! -f "$l_kfile" ] && l_kfile="/etc/dconf/db/$l_gpname.d/00-media-autorun"
 # Check if profile file exists
 if grep -Pq -- "^\h*system-db:$l_gpname\b" /etc/dconf/profile/*; then
 echo -e "\n - dconf database profile exists in: \"$(grep -Pl -- "^\h*system-db:$l_gpname\b" /etc/dconf/profile/*)\""
 else
 [ ! -f "/etc/dconf/profile/user" ] && l_gpfile="/etc/dconf/profile/user" || l_gpfile="/etc/dconf/profile/user2"
 echo -e " - creating dconf database profile"
 {
 echo -e "\nuser-db:user"
 echo "system-db:$l_gpname"
 } >> "$l_gpfile"
 fi
 # create dconf directory if it doesn't exists
 l_gpdir="/etc/dconf/db/$l_gpname.d"
 if [ -d "$l_gpdir" ]; then
 echo " - The dconf database directory \"$l_gpdir\" exists"
 else
 echo " - creating dconf database directory \"$l_gpdir\""
 mkdir "$l_gpdir"
 fi
 # check autorun-never setting
 if grep -Pqs -- '^\h*autorun-never\h*=\h*true\b' "$l_kfile"; then
 echo " - \"autorun-never\" is set to true in: \"$l_kfile\""
 else
 echo " - creating or updating \"autorun-never\" entry in \"$l_kfile\""
 if grep -Psq -- '^\h*autorun-never' "$l_kfile"; then
 sed -ri 's/(^\s*autorun-never\s*=\s*)(\S+)(\s*.*)$/\1true \3/' "$l_kfile"
 else
 ! grep -Psq -- '\^\h*\[org\/gnome\/desktop\/media-handling\]\b' "$l_kfile" && echo '[org/gnome/desktop/media-handling]' >> "$l_kfile"
 sed -ri '/^\s*\[org\/gnome\/desktop\/media-handling\]/a \\nautorun-never=true' "$l_kfile"
 fi
 fi
 else
 echo -e "\n - GNOME Desktop Manager package is not installed on the system\n - Recommendation is not applicable"
 fi
 # update dconf database
 dconf update
}

See Also

https://workbench.cisecurity.org/benchmarks/17074

Item Details

References: CSCv7|8.5

Plugin: Unix

Control ID: 1f6d74612c0ad4aeabc3f92fc32a15c51c342cfa62c5c10fcefcfabfebb82ef1