cyberstrikeus Ensure sticky bit is set on all world-writable directories
Description
Setting the sticky bit on world writable directories prevents users from deleting or renaming files in that directory that are not owned by them.
Rationale
This feature prevents the ability to delete or rename files in world writable directories (such as /tmp) that are owned by another user.
Impact
None noted.
Audit Procedure
Command Line
# Run the following command to verify no world writable directories exist without the sticky bit set:
df --local -P | awk '(if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -type d \( -perm -0002 -a ! -perm -1000 \) 2>/dev/null
Expected Result
No output should be returned.
Remediation
Command Line
# Run the following command to set the sticky bit on all world writable directories:
df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -type d \( -perm -0002 -a ! -perm -1000 \) 2>/dev/null | xargs -I '{}' chmod a+t '{}'
Default Value
The sticky bit is set on /tmp by default.
References
- CIS Controls Version 7 - 5.1 Establish Secure Configurations: Maintain documented, standard security configuration standards for all authorized operating systems and software.
Profile
Level 1 - Server / Level 1 - Workstation, Assessment: Automated