Container-Optimized OS
TMA-COS-6.2.13
Ensure users' .netrc Files are not group or world accessible
Description
While the system administrator can establish secure permissions for users' .netrc files, the users can easily override these. .netrc files may contain unencrypted passwords that may be used to attack other systems.
Méthode de vérification
Méthode d'audit: Revue manuelle
Run the following script and verify no results are returned: #!/bin/bash grep -E -v '^(root|system-halt|sync|system-shutdown)' /etc/passwd | awk -F: '($7 != "'"$(which nologin)"'" && $7 != "/bin/false") { print $1 " " $6 }' | while read user dir; do if [ ! -d "$dir" ]; then echo "The home directory ($dir) of user $user does not exist." else for file in $dir/.netrc; do if [ ! -h "$file" -a -f "$file" ]; then fileperm=$(ls -ld $file | cut -f1 -d" ") if [ $(echo $fileperm | cut -c5) != "-" ]; then echo "Group Read set on $file" fi if [ $(echo $fileperm | cut -c6) != "-" ]; then echo "Group Write set on $file" fi if [ $(echo $fileperm | cut -c7) != "-" ]; then echo "Group Execute set on $file" fi if [ $(echo $fileperm | cut -c8) != "-" ]; then echo "Other Read set on $file" fi if [ $(echo $fileperm | cut -c9) != "-" ]; then echo "Other Write set on $file" fi if [ $(echo $fileperm | cut -c10) != "-" ]; then echo "Other Execute set on $file" fi fi done fi done
Méthode de correction
Méthode de correction: Recommandation ou correctif d'infrastructure
Making global modifications to users' files without alerting the user community can result in unexpected outages and unhappy users. Therefore, it is recommended that a monitoring policy be established to report user .netrc file permissions and determine the action to be taken in accordance with site policy.
Propriétés
- Systèmes d'exploitation
- Tous
- Étiquettes
- access-controlcontainer-optimized-oscos
- Référence
- CIS Google Container-Optimized OS Benchmark v1.2.0 - 6.2.13 Ensure users' .netrc Files are not group or world accessible