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基于 SOC 职业分类
正在显示 SKILL.md
| name | cis-ubuntu2004-v300-6-3-3-6 |
| description | Ensure use of privileged commands are collected |
| category | cis-logging |
| version | 3.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-20.04","auditing","auditd"] |
| cis_id | 6.3.3.6 |
| cis_benchmark | CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Monitor privileged programs, those that have the setuid and/or setgid bit set on execution, to determine if unprivileged users are running these commands.
Execution of privileged commands by non-privileged users could be an indication of someone trying to gain unauthorized access to the system.
Both the audit and remediation section of this recommendation will traverse all mounted file systems that is not mounted with either noexec or nosuid mount options. If there are large file systems without these mount options, such traversal will be significantly detrimental to the performance of the system.
Before running either the audit or remediation section, inspect the output of the following command to determine exactly which file systems will be traversed:
# findmnt -n -l -k -it $(awk '/nodev/ { print $2 }' /proc/filesystems | paste -sd,) | grep -Pv "noexec|nosuid"
To exclude a particular file system due to adverse performance impacts, update the audit and remediation sections by adding a sufficiently unique string to the grep statement. The above command can be used to test the modified exclusions.
On disk configuration - Run the following script to check on disk rules:
#!/usr/bin/env bash
{
for PARTITION in $(findmnt -n -l -k -it $(awk '/nodev/ { print $2 }' /proc/filesystems | paste -sd,) | grep -Pv "noexec|nosuid" | awk '{print $1}'); do
for PRIVILEGED in $(find "${PARTITION}" -xdev -perm /6000 -type f); do
grep -qr "${PRIVILEGED}" /etc/audit/rules.d && printf "OK: '' found in auditing rules.\n" ||
}
Verify that all output is OK.
Running configuration - Run the following script to check loaded rules:
#!/usr/bin/env bash
{
RUNNING=$(auditctl -l)
[ -n "${RUNNING}" ] && for PARTITION in $(findmnt -n -l -k -it $(awk '/nodev/ { print $2 }' /proc/filesystems | paste -sd,) | grep -Pv "noexec|nosuid" | awk '{print $1}'); do
for PRIVILEGED in $(find "${PARTITION}" -xdev -perm /6000 -type f); do
printf -- "${RUNNING}" | grep -q "${PRIVILEGED}" && printf "OK: '${PRIVILEGED}' found in auditing rules.\n" || printf "Warning: '${PRIVILEGED}' not found in running configuration.\n"
done
done \
|| printf "ERROR: Variable 'RUNNING' is unset.\n"
}
Verify that all output is OK.
All privileged commands should be found in auditing rules.
Edit or create a file in the /etc/audit/rules.d/ directory, ending in .rules extension, with the relevant rules to monitor the use of privileged commands.
Example script:
#!/usr/bin/env bash
{
UID_MIN=$(awk '/^\s*UID_MIN/{print $2}' /etc/login.defs)
AUDIT_RULE_FILE="/etc/audit/rules.d/50-privileged.rules"
NEW_DATA=()
for PARTITION in $(findmnt -n -l -k -it $(awk '/nodev/ { print $2 }' /proc/filesystems | paste -sd,) | grep -Pv "noexec|nosuid" | awk '{print $1}'); do
readarray -t DATA < <(find "${PARTITION}" -xdev -perm /6000 -type f | awk -v UID_MIN=${UID_MIN} '{print "-a always,exit -F path=" $1 " -F perm=x -F auid>="UID_MIN" -F auid!=unset -k privileged" }')
for ENTRY in "${DATA[@]}"; do
NEW_DATA+=("${ENTRY}")
done
done
readarray 6> /dev/null -t OLD_DATA < "${AUDIT_RULE_FILE}"
COMBINED_DATA=( "${OLD_DATA[@]}" "${NEW_DATA[@]}" )
printf '%s\n' "${COMBINED_DATA[@]}" | sort -u > "${AUDIT_RULE_FILE}"
}
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
Special mount points: If there are any special mount points that are not visible by default from just scanning /, change the PARTITION variable to the appropriate partition and re-run the remediation.
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 8.5 Collect Detailed Audit Logs | X | X | |
| v7 | 6.2 Activate audit logging | X | X | X |
MITRE ATT&CK Mappings: T1562, T1562.006 / TA0002 / M1026