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npx skills add https://github.com/CyberStrikeus/CyberStrike --skill cis-ubuntu1804-v220-5-2-3-8命令会保持在同一行。复制前请横向滚动并检查完整内容。
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基于 SOC 职业分类
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| name | cis-ubuntu1804-v220-5-2-3-8 |
| version | 2.2.0 |
| date_published | "2024-01-01T00:00:00.000Z" |
| category | cis-logging |
| description | Ensure events that modify user/group information are collected |
| author | CIS Benchmarks |
| tags | ["cis","ubuntu","linux","ubuntu-18.04","auditing","auditd"] |
| target | {"platform":"linux","version":"18.04"} |
| severity_boost | {} |
Record events affecting the modification of user or group information, including that of passwords and old passwords if in use.
/etc/group - system groups/etc/passwd - system users/etc/gshadow - encrypted password for each group/etc/shadow - system user passwords/etc/security/opasswd - storage of old passwords if the relevant PAM module is in useThe parameters in this section will watch the files to see if they have been opened for write or have had attribute changes (e.g. permissions) and tag them with the identifier "identity" in the audit log file.
Unexpected changes to these files could be an indication that the system has been compromised and that an unauthorized user is attempting to hide their activities or compromise additional accounts.
Run the following command to check the on disk rules:
awk '/^ *-w/ \
&&(/\/etc\/group/ \
||/\/etc\/passwd/ \
||/\/etc\/gshadow/ \
||/\/etc\/shadow/ \
||/\/etc\/security\/opasswd/ ) \
&&/ +-p *wa/ \
&&(/ key= *[!-~]* *$/||/ -k *[!-~]* *$/)/' /etc/audit/rules.d/*.rules
Verify the output matches:
-w /etc/group -p wa -k identity
-w /etc/passwd -p wa -k identity
-w /etc/gshadow -p wa -k identity
-w /etc/shadow -p wa -k identity
-w /etc/security/opasswd -p wa -k identity
Run the following command to check loaded rules:
auditctl -l | awk '/^ *-w/ \
&&(/\/etc\/group/ \
||/\/etc\/passwd/ \
||/\/etc\/gshadow/ \
||/\/etc\/shadow/ \
||/\/etc\/security\/opasswd/ ) \
&&(/ key= *[!-~]* *$/||/ -k *[!-~]* *$/)/'
Verify the output matches:
-w /etc/group -p wa -k identity
-w /etc/passwd -p wa -k identity
-w /etc/gshadow -p wa -k identity
-w /etc/shadow -p wa -k identity
-w /etc/security/opasswd -p wa -k identity
Edit or create a file in the /etc/audit/rules.d/ directory, ending in .rules extension, with the relevant rules to monitor events that modify user/group information.
Example:
printf "
-w /etc/group -p wa -k identity
-w /etc/passwd -p wa -k identity
-w /etc/gshadow -p wa -k identity
-w /etc/shadow -p wa -k identity
-w /etc/security/opasswd -p wa -k identity
" >> /etc/audit/rules.d/50-identity.rules
Merge and load the rules into active configuration:
augenrules --load
Check if reboot is required:
if [[ $(auditctl -s | grep "enabled") =~ "2" ]]; then printf "Reboot required to load rules\n"; fi
| Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 8.5 Collect Detailed Audit Logs | ● | ● | |
| v7 | 4.8 Log and Alert on Changes to Administrative Group Membership | ● | ● |
| Techniques / Sub-techniques | Tactics | Mitigations |
|---|---|---|
| T1562, T1562.006 | TA0004 | M1047 |
Potential reboot required: If the auditing configuration is locked (-e 2), then augenrules will not warn in any way that rules could not be loaded into the running configuration. A system reboot will be required to load the rules into the running configuration.
System call structure: For performance (man 7 audit.rules) reasons it is preferable to have all the system calls on one line. However, your configuration may have them on one line each or some other combination.