The kernel core dump data directory must not have an extended ACL.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000225

SV-64437r2_rule The kernel core dump data directory must not have an extended ACL.

Vulnerability discussion

Kernel core dumps may contain the full contents of system memory at the time of the crash. As the system memory may contain sensitive information, it must be protected accordingly. If there is an extended ACL for the kernel core dump data directory, unauthorized users may be able to view or to modify kernel core dump data files.

Check content

Determine the kernel core dump data directory and check its permissions. Procedure: Verify the location of the kernel core dump data directory: # grep “path” /etc/kdump.conf Note: If this setting is not configured or commented out, the default kernel dump data directory is /var/crash. Check the permissions of the dump data directory: # ls -ld If the permissions include a '+', the directory has an extended ACL. If the directory has an extended ACL and it has not been documented with the IAO, this is a finding.

Fix text

Remove the extended ACL from the directory. # setfacl --remove-all

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