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Introduction:
Modern external reconnaissance forces security professionals to juggle a dozen browser tabs—Shodan, crt.sh, MXToolbox, VirusTotal, and more—wasting precious time on context switching. The newly released free tool “wtfis.exposed” consolidates over 20 real-time security checks into a single paste, scanning IPs, domains, or emails for open ports, CDN bypasses, secret leaks, and cloud exposures without any setup or paid APIs.
Learning Objectives:
- Perform rapid external reconnaissance on any target using a unified OSINT dashboard
- Identify critical misconfigurations including WAF bypass vectors, dangling CNAMEs, and open cloud buckets
- Validate email spoofing risk via SPF/DMARC/DKIM and detect CORS vulnerabilities that enable session theft
You Should Know:
1. One-Paste Reconnaissance – How to Use wtfis.exposed
The tool runs entirely in your browser at https://wtfis-exposed.vercel.app (shortened: https://lnkd.in/dpQtQabT). No installation, no API keys, no data logging. Simply paste an IP address, domain name, or email address and watch results stream live as each of the 20+ checks completes.
Step‑by‑step guide:
- Navigate to the provided URL using any modern browser (Chrome, Firefox, Edge).
- In the input field, enter a target. Example: `example.com` or `8.8.8.8` or
[email protected]. - Click the “Scan” button (or equivalent). The interface will progressively display results for Shodan InternetDB, CDN detection, IPv6 WAF bypass, JS secret scanner, subdomain takeover, cloud bucket exposure, DNS records, SSL expiry, security headers, DNSBL, certificate transparency, reverse IP, Wayback Machine history, Google Safe Browsing, Tor exit node status, BGP/ASN info, WHOIS, and more.
- Hover over or click each result for an explanation. Since no data is stored, you can refresh and rescan as needed.
Manual verification – Linux / macOS:
Check DNS records manually dig example.com A AAAA MX TXT NS CAA Check SPF, DMARC, DKIM dig TXT example.com | grep "v=spf1" dig TXT _dmarc.example.com dig TXT selector._domainkey.example.com Check SSL expiry echo | openssl s_client -servername example.com -connect example.com:443 2>/dev/null | openssl x509 -noout -dates
Windows (PowerShell):
Resolve-DnsName example.com -Type A
Resolve-DnsName example.com -Type TXT
SSL expiry
(Get-Date) - (New-Object System.Net.Sockets.TcpClient("example.com", 443)).GetStream().Close()
For full SSL check, use: openssl.exe s_client -connect example.com:443
2. Detecting CDN and IPv6 WAF Bypasses
Many penetration testers miss that a WAF (Cloudflare, Akamai) may protect only IPv4 while the origin’s IPv6 address is exposed. wtfis.exposed automatically checks for this, potentially revealing the real backend IP.
Step‑by‑step guide to replicate manually:
- Obtain the target’s A and AAAA records: `dig example.com A +short` and
dig example.com AAAA +short. - If AAAA records point to different IPs than the CDN’s ranges, try accessing the IPv6 address directly: `curl -6 http://[2001:db8::1]/`.
- To identify CDN providers, query `whois` on the IP or use
curl -I https://example.com | grep -i "server\|cf-ray\|akamai\|cloudfront".
Mitigation: Configure IPv6 firewall rules and ensure origin servers do not respond directly to IPv6 requests. Use CDN‑provided origin shields and restrict inbound traffic to CDN IP ranges only.
3. JavaScript Secret Scanner – Exposing Hardcoded Credentials
Modern web apps leak AWS keys, Stripe tokens, Firebase configs, and internal endpoints inside publicly accessible JavaScript files. The tool automatically fetches and scans all JS files linked from the target domain.
Manual approach using Linux:
Download all JS files from a domain
curl -s https://example.com | grep -Eo 'src="[^"].js"' | cut -d'"' -f2 | while read js; do curl -s "$js" >> all_js.txt; done
Search for secrets
grep -E "AKIA[0-9A-Z]{16}|sk_live_[0-9a-zA-Z]{24}|AIza[0-9A-Za-z-_]{35}" all_js.txt
Windows (PowerShell with curl):
$jsUrls = Invoke-WebRequest -Uri "https://example.com" -UseBasicParsing | Select-String -Pattern 'src="([^"].js)"' -AllMatches
$jsUrls.Matches | ForEach-Object { Invoke-WebRequest -Uri $<em>.Groups[bash].Value -UseBasicParsing } | Out-File -FilePath all_js.txt
Select-String -Path all_js.txt -Pattern "AKIA[0-9A-Z]{16}|sk_live</em>[0-9a-zA-Z]{24}|AIza[0-9A-Za-z-_]{35}"
If a secret is found, revoke it immediately and rotate credentials. Never hardcode secrets in client‑side assets.
4. Subdomain Takeover & Cloud Bucket Exposure
A dangling CNAME record pointing to a decommissioned service (GitHub Pages, Heroku, S3 bucket) allows an attacker to claim that subdomain. The tool checks 20+ cloud services for takeover opportunities and also scans for open S3, GCS, or Azure Blob containers.
Step‑by‑step manual check:
- Enumerate subdomains via certificate transparency: `curl -s “https://crt.sh/?q=%.example.com&output=json” | jq -r ‘.[].name_value’ | sort -u`
– For each subdomain, check CNAME: `dig cname sub.example.com +short`
– Test if the target service is unclaimed: e.g., for an S3 bucket CNAME, runaws s3 ls s3://bucket-name --no-sign-request. If it returns “NoSuchBucket” but the CNAME exists, it’s vulnerable.
Prevention: Remove DNS records when cloud resources are decommissioned. Enable bucket policies that deny public listing.
5. Email Spoofing Readiness – SPF, DMARC, DKIM
Attackers can impersonate your domain if email authentication is misconfigured. The tool displays SPF, DMARC, and DKIM records and indicates whether the domain can be spoofed right now.
Manual validation:
SPF – should end with ~all (softfail) or -all (hardfail) dig TXT example.com | grep "v=spf1" DMARC – policy of p=quarantine or p=reject is secure dig TXT _dmarc.example.com DKIM – check selector presence dig TXT default._domainkey.example.com
If SPF is missing or uses +all, or DMARC is absent, spoofing is trivial. Hardening steps:
– Publish SPF record with `-all`
– Set DMARC policy to `p=reject` and `rua=mailto:[email protected]`
– Implement DKIM signing on your mail server
6. CORS Misconfiguration – Reflected Origin with Credentials
A CORS misconfiguration allowing `Access-Control-Allow-Origin: ` and `Access-Control-Allow-Credentials: true` together enables any website to steal authenticated user data. The tool tests for reflected origin headers.
Manual test using curl:
curl -H "Origin: https://evil.com" -I https://api.example.com/endpoint | grep -i "access-control-allow-origin"
If the response echoes https://evil.com` and includesAccess-Control-Allow-Credentials: true`, the API is vulnerable.
Mitigation: Never echo arbitrary origins. Whitelist specific domains and avoid `Allow-Credentials: true` when using wildcard.
7. DNSBL & Threat Intelligence Checks
The tool queries 9 DNS blocklists (DNSBL) in parallel to see if the target IP is listed as a spam source or malware host. It also checks Google Safe Browsing and Tor exit node status.
Manual check using a Linux command:
Check against Spamhaus ZEN (replace IP octets reversed) dig +short 2.0.0.127.zen.spamhaus.org
If the result is `127.0.0.2` or higher, the IP is blacklisted. To delist, follow each blocklist’s removal process. Regularly monitor your outbound email IPs.
What Undercode Say:
- One consolidated interface dramatically reduces reconnaissance friction, letting analysts focus on findings instead of tool juggling.
- The tool’s inclusion of IPv6 WAF bypass detection and JS secret scanning goes beyond typical free OSINT platforms, offering red team–grade checks.
- Zero data storage and no API keys make it safe for use against any target, including internal assets, without compliance concerns.
- Manual validation remains essential; automated scans may miss nuanced logic flaws or require deeper inspection via commands like `dig` and
curl. - Cloud bucket exposure and subdomain takeover remain two of the most exploited misconfigurations in bug bounties – this tool surfaces them instantly.
- CORS misconfiguration testing with reflected origin credentials is a standout feature rarely found in free tools.
- The parallel DNSBL check saves time for incident responders checking IP reputation.
- As offensive security shifts toward automation, lightweight web‑based recon tools lower the barrier for beginners while empowering experts.
- No single tool replaces a methodology, but wtfis.exposed serves as an excellent first pass before deeper enumeration with Burp, Nmap, or custom scripts.
- Always verify results: false positives exist, especially with secret scanning – but a positive is worth immediate investigation.
Prediction:
Free, all‑in‑one recon tools like wtfis.exposed will accelerate the democratization of security testing, reducing entry barriers for junior testers and bug bounty hunters. However, defenders will respond by increasing reliance on obfuscation and perimeterless architectures (SASE, ZTNA), rendering simple exposure checks less effective. Expect future iterations to integrate AI‑driven prioritization of findings and real‑time exploitation proof‑of‑concepts, shifting the cat‑and‑mouse game toward continuous automated red teaming. Meanwhile, misconfigurations will remain the leading cause of breaches – tools that simplify their detection will become mandatory in every tester’s arsenal.
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Reported By: Nagendratiwari01 Cybersecurity – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
