القائمة
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اقرأ SKILL.md وأي ملفات مرافقة يعرضها SkillsMP قبل أن تقرر التثبيت.
التثبيت باستخدام Codex أو Claude انسخ هذا Prompt والصقه في Codex أو Claude أو مساعد آخر ليراجع صفحة Skill ويثبّتها لك.
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npx skills add https://github.com/CyberStrikeus/CyberStrike --skill cis-ubuntu1804-v220-5-2-3-11يبقى الأمر في سطر واحد. مرّر أفقيًا لمراجعته كاملًا قبل النسخ.
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استنادا إلى تصنيف SOC المهني
عرض SKILL.md
| name | cis-ubuntu1804-v220-5-2-3-11 |
| version | 2.2.0 |
| date_published | "2024-01-01T00:00:00.000Z" |
| category | cis-logging |
| description | Ensure successful file system mounts are collected |
| author | CIS Benchmarks |
| tags | ["cis","ubuntu","linux","ubuntu-18.04","auditing","auditd"] |
| target | {"platform":"linux","version":"18.04"} |
| severity_boost |
| {} |
Monitor the use of the mount system call. The mount (and umount) system call controls the mounting and unmounting of file systems. The parameters below configure the system to create an audit record when the mount system call is used by a non-privileged user.
It is highly unusual for a non privileged user to mount file systems to the system. While tracking mount commands gives the system administrator evidence that external media may have been mounted (based on a review of the source of the mount and confirming it's an external media type), it does not conclusively indicate that data was exported to the media. System administrators who wish to determine if data were exported, would also have to track successful open, creat and truncate system calls requiring write access to a file under the mount point of the external media file system. This could give a fair indication that a write occurred. The only way to truly prove it, would be to track successful writes to the external media. Tracking write system calls could quickly fill up the audit log and is not recommended. Recommendations on configuration options to track data export to media is beyond the scope of this document.
Run the following command to verify auditd is configured in accordance with site policy.
UID_MIN=$(awk '/^\s*UID_MIN/{print $2}' /etc/login.defs)
[ -n "${UID_MIN}" ] && awk "/^ *-a *always,exit/ \
&&(/ -F *arch=b(32|64)/) \
&&/ -S/ \
&&/mount/ \
&&(/ key= *[!-~]* *$/||/ -k *[!-~]* *$/)/" /etc/audit/rules.d/*.rules \
|| printf "ERROR: Variable 'UID_MIN' is unset.\n"
Verify output includes:
-a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=unset -k mounts
-a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=unset -k mounts
UID_MIN=$(awk '/^\s*UID_MIN/{print $2}' /etc/login.defs)
[ -n "${UID_MIN}" ] && auditctl -l | awk "/^ *-a *always,exit/ \
&&(/ -F *arch=b(32|64)/) \
&&/ -S/ \
&&/mount/ \
&&(/ key= *[!-~]* *$/||/ -k *[!-~]* *$/)/" \
|| printf "ERROR: Variable 'UID_MIN' is unset.\n"
Verify output includes:
-a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=-1 -F key=mounts
-a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=-1 -F key=mounts
Follow the same procedures as for 64 bit systems and ignore any entries with b64.
Edit or create a file in the /etc/audit/rules.d/ directory ending in .rules extension, with the relevant rules to monitor successful file system mounts.
Example:
UID_MIN=$(awk '/^\s*UID_MIN/{print $2}' /etc/login.defs)
[ -n "${UID_MIN}" ] && printf "
-a always,exit -F arch=b32 -S mount -F auid>=%s -F auid!=unset -k mounts
-a always,exit -F arch=b64 -S mount -F auid>=%s -F auid!=unset -k mounts
" "${UID_MIN}" "${UID_MIN}" >> /etc/audit/rules.d/50-mounts.rules || printf "ERROR: Variable 'UID_MIN' is unset.\n"
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
Follow the same procedures as for 64 bit systems and ignore any entries with b64.
| Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 8.5 Collect Detailed Audit Logs | ● | ● | |
| v7 | 5.1 Establish Secure Configurations | ● | ● | ● |
| Techniques / Sub-techniques | Tactics | Mitigations |
|---|---|---|
| T1562, T1562.006 | TA0005 | 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.