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macOS post-exploitation for credential harvesting, DTrace monitoring, TCC bypass, and stealth operations via native tools
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Showing SKILL.md
| name | cis-ubuntu1204-v110-13-14 |
| description | Check for Duplicate UIDs |
| category | cis-os-hardening |
| version | 1.1.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu",12.04,"linux","user-management","uid","duplicate","accountability"] |
| cis_id | 13.14 |
| cis_benchmark | CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Although the useradd program will not let you create a duplicate User ID (UID), it is possible for an administrator to manually edit the /etc/passwd file and change the UID field.
Users must be assigned unique UIDs for accountability and to ensure appropriate access protections.
This script checks to make sure all UIDs in the /etc/passwd file are unique.
#!/bin/bash
/bin/cat /etc/passwd | /usr/bin/cut -f3 -d":" | /usr/bin/sort -n | /usr/bin/uniq -c |\
while read x ; do
[ -z "${x}" ] && break
set - $x
if [ $1 -gt 1 ]; then
users=`/usr/bin/awk -F: '($3 == n) { print $1 }' n=$2 \
/etc/passwd | /usr/bin/xargs`
echo "Duplicate UID ($2): ${users}"
fi
done
No output should be returned. Any output indicates duplicate UIDs exist in /etc/passwd.
Based on the results of the script, establish unique UIDs and review all files owned by the shared UID to determine which UID they are supposed to belong to.
The useradd command assigns unique UIDs by default.
Level 1 - Scored