Check: SLES-12-020460
SLES 12 STIG:
SLES-12-020460
(in versions v2 r13 through v2 r6)
Title
The SUSE operating system must generate audit records for all uses of the chmod, fchmod, and fchmodat system calls. (Cat II impact)
Discussion
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). 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 is helped, however, by combining syscalls into one rule whenever possible. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000062-GPOS-00031, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215
Check Content
Verify the SUSE operating system generates an audit record for all uses of the "chmod", "fchmod" and "fchmodat" system calls. Verify that the following command call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": > sudo grep chmod /etc/audit/audit.rules -a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=4294967295 -k perm_mod If both the "b32" and "b64" audit rules are not defined for the "chmod", "fchmod", and "fchmodat" syscalls, this is a finding.
Fix Text
Configure the SUSE operating system to generate an audit record for all uses of the "chmod", "fchmod", and "fchmodat" system calls. Add or update the following rules to "/etc/audit/rules.d/audit.rules": -a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=4294967295 -k perm_mod -a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=4294967295 -k perm_mod The audit daemon must be restarted for the changes to take effect. > sudo systemctl restart auditd.service
Additional Identifiers
Rule ID: SV-217227r854126_rule
Vulnerability ID: V-217227
Group Title: SRG-OS-000037-GPOS-00015
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000130 |
The information system generates audit records containing information that establishes what type of event occurred. |
| CCI-000169 |
The information system provides audit record generation capability for the auditable events defined in AU-2 a. at organization-defined information system components. |
| CCI-000172 |
The information system generates audit records for the events defined in AU-2 d. with the content defined in AU-3. |
| CCI-002884 |
The organization audits nonlocal maintenance and diagnostic sessions^ organization-defined audit events. |