thinQtankLABS

Detection Engineering & Incident Response: CVE-2025-32463

Respond to a sudo --chroot local-privilege-escalation compromise (CVE-2025-32463). Reconstruct the timeline from the sudo auth and activity logs, see how --chroot loaded an attacker nsswitch.conf as root, find the SUID-root backdoor persistence, engineer a detection rule for the chroot option, then contain, eradicate, upgrade, verify and report.

Intermediate 20 guided steps 6 tasks About 75 minutes Runs in your browser

Skills you will practice

  • Log analysis
  • detection and IR; Incident-handling lifecycle; Privilege escalation and IOCs; Security Operations and host security

Certifications this lab maps to

This lab builds hands-on skills that appear on these certification exams. thinQtank Learning runs instructor-led training camps for each — click one to see upcoming classes.

CompTIA CySA+ CS0-003 Log analysis, detection and IR Training at thinQtank Learning EC-Council Certified Incident Handler E|CIH Incident-handling lifecycle Training at thinQtank Learning EC-Council Certified Ethical Hacker CEH Privilege escalation and IOCs Training at thinQtank Learning ISC2 CISSP CISSP Security Operations and host security Training at thinQtank Learning
Part of these certification lab packages: CySA+ CS0-003 Linux+ XK0-005 CISSP Certified Ethical Hacker (CEH) CEH Certified Incident Handler (E|CIH) E|CIH GCIH GCIH GCIA GCIA

The scenario

A shared host (CVE-2025-32463 open) logged local user "jdoe" running sudo with --chroot pointed at their own directory, then a root shell and a SUID-root file. You are the responder. Classify it.

What you will do

  1. Open and classify the incident4 steps

    Open the incident · Read the alert · Read the ticket · Classify it

  2. Reconstruct the timeline3 steps

    Pull the attacker’s sudo calls · Correlate the activity log · What caused the escalation?

  3. Impact and persistence3 steps

    Inspect the SUID backdoor · What persistence? · Record IOCs

  4. Engineer a detection rule4 steps

    Study the sample · Write a rule · Test and tune · Why key on --chroot?

  5. Contain, eradicate, verify4 steps

    Eradicate the SUID backdoor · Upgrade sudo · Verify the host · Confirm detection holds

  6. Report2 steps

    Write the report · What else must be assumed?

How this lab works

A real Linux-style console. Commands run against real files, so hashes, hex dumps and comparisons give real results.

A file browser where you can place evidence into the lab, either the file provided or one of your own.

Reset a single step, a whole task or the entire lab. The environment is rebuilt so you can try again cleanly.

Progress saves after every step. Close the tab and come back later; your files and answers are waiting.