đLinux PrivEsc
Practice your Linux Privilege Escalation skills on an intentionally misconfigured Debian VM with multiple ways to get root! SSH is available. Credentials: user:password321
Room Attributes
Value
Subscription Required
False [Free]
Type
Walkthroughs
Difficulty
Medium
Tags
PrivEsc, Privilege Escalation, Linux, Linux Privilege Escalation
Task 1 Deploy the Vulnerable Debian VM
Deploy the machine and login to the "user" account using SSH.
No answer needed
Run the "id" command. What is the result?
Task 2 Service Exploits
Read and follow along with the above.
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Task 3 Weak File Permissions - Readable /etc/shadow
What is the root user's password hash?
What hashing algorithm was used to produce the root user's password hash?
HINT: john the ripper should automatically identify it when cracking!
What is the root user's password?
Task 4 Weak File Permissions - Writable /etc/shadow
Read and follow along with the above.
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Task 5 Weak File Permissions - Writable /etc/passwd
Run the "id" command as the newroot user. What is the result?
Task 6 Sudo - Shell Escape Sequences
How many programs is "user" allowed to run via sudo?
One program on the list doesn't have a shell escape sequence on GTFOBins. Which is it?
Consider how you might use this program with sudo to gain root privileges without a shell escape sequence.
HINT: Play around with certain options the program has!
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Task 7 Sudo - Environment Variables
Read and follow along with the above.
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Task 8 Cron Jobs - File Permissions
Read and follow along with the above.
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Task 9 Cron Jobs - PATH Environment Variable
What is the value of the PATH variable in /etc/crontab?
Task 10 Cron Jobs - Wildcards
Read and follow along with the above.
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Task 11 SUID / SGID Executables - Known Exploits
Read and follow along with the above.
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Task 12 SUID / SGID Executables - Shared Object Injection
Read and follow along with the above.
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Task 13 SUID / SGID Executables - Environment Variables
Read and follow along with the above.
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Task 14 SUID / SGID Executables - Abusing Shell Features (#1)
Read and follow along with the above.
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Task 15 SUID / SGID Executables - Abusing Shell Features (#2)
Read and follow along with the above.
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Task 16 Passwords & Keys - History Files
What is the full mysql command the user executed?
Task 17 Passwords & Keys - Config Files
What file did you find the root user's credentials in?
Task 18 Passwords & Keys - SSH Keys
Read and follow along with the above.
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Task 19 NFS
What is the name of the option that disables root squashing?
Task 20 Kernel Exploits
Read and follow along with the above.
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Task 21 Privilege Escalation Scripts
Experiment with all three tools, running them with different options. Do all of them identify the techniques used in this room?
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