Check: OL6-00-000197
Oracle Linux 6 STIG:
OL6-00-000197
(in versions v2 r7 through v2 r6)
Title
The audit system must be configured to audit failed attempts to access files and programs. (Cat III impact)
Discussion
Unsuccessful attempts to access files could be an indicator of malicious activity on a system. Auditing these events could serve as evidence of potential system compromise. The system call rules are loaded into a matching engine that intercepts each syscall made by all programs on the system. Therefore, it is very important to use syscall rules only when absolutely necessary, since these affect performance. The more rules, the bigger the performance hit. The performance can be helped, however, by combining syscalls into one rule whenever possible.
Check Content
To verify that the audit system collects unauthorized file accesses, run the following commands: # grep EACCES /etc/audit/audit.rules -a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access -a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EACCES -F auid=0 -k access -a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access -a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EACCES -F auid=0 -k access # grep EPERM /etc/audit/audit.rules -a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access -a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EPERM -F auid=0 -k access -a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access -a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EPERM -F auid=0 -k access If the system is 64-bit and does not return rules for both "b32" and "b64" architectures, this is a finding. If the system is not configured to audit "EACCES" and "EPERM" of the "creat", "open", "openat", "truncate", "ftruncate", and "open_by_handle_at" system calls, this is a finding.
Fix Text
At a minimum, the audit system should collect unauthorized file accesses for all users and root. Add the following to "/etc/audit/audit.rules": -a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access -a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access -a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EACCES -F auid=0 -k access -a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EPERM -F auid=0 -k access If the system is 64-bit, then also add the following: -a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access -a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access -a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EACCES -F auid=0 -k access -a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate,open_by_handle_at -F exit=-EPERM -F auid=0 -k access
Additional Identifiers
Rule ID: SV-208906r810471_rule
Vulnerability ID: V-208906
Group Title: SRG-OS-000064
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000172 |
The information system generates audit records for the events defined in AU-2 d. with the content defined in AU-3. |
Controls
Number | Title |
---|---|
AU-12 |
Audit Generation |