Root-Cause & Secure-Code Remediation: SSTI
Fix Server-Side Template Injection (SSTI) (CWE-1336) at the source. Read the vulnerable handler, see the sink, reject a denylist, apply the real fix, record defense-in-depth hardening, and verify with audit and vulnscan.
Skills you will practice
- Secure software design
- safe templating; Server-Side Template Injection root cause and remediation; Secure architecture and defense in depth
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.
The scenario
Triage locked down the config; IR handled the breach. You are the engineer who has to fix the code and record the hardening. Start at the source.
What you will do
- Understand the root cause4 steps
Open the source · Read the root-cause note · Read the vulnerable code · What is the sink?
- Audit and reject the weak fix4 steps
Audit the vulnerable file · Read the proposed fix · Audit the weak fix · Why is the weak fix insufficient?
- Apply the fix and harden8 steps
Read the correct fix · Audit the correct fix · What makes it safe? · Deploy the fix · …
- Reason and document4 steps
Verify the deployed code · Two layers · Write the PR note · The principle
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.