Sec-88
  • 🧑Whoami
  • 🕸️Web-AppSec
    • Features Abuse
      • 2FA
      • Ban Feature
      • CAPTCHA
      • Commenting
      • Contact us
      • File-Upload
      • Inviting Feature
      • Messaging Features
      • Money-Related Features
      • Newsletter
      • Profile - Settings
      • Registration
      • Reset Password
      • Review
      • Rich Editor/Text
      • Social Sharing
      • Billing-Shipping Address Management
      • Integrations - Webhooks
      • API Key Management
    • Reconnaissance
      • Attacking Organizations with big scopes
    • Subdomain Enumeration
    • Fingerprinting
    • Dorking
    • XSS-HTML Injection
    • Improper Authentication
      • JWT Security
    • OAUTH Misconfigurations
      • OAuth 2.0 Basics
      • OAUTH Misconfigurations
    • Auth0 Misconfigurations
    • Broken Access Control
      • Insecure Direct Object References (IDOR)
      • 403 Bypass
    • Broken Link Injection
    • Command Injection
    • CORS
    • CRLF
    • CSRF
    • Host Header Attacks
    • HTTP request smuggling
    • JSON Request Testing
    • LFI
      • LFI to RCE
    • No Rate Limit
    • Parameters Manual Testing
    • Open Redirect
    • Registration & Takeover Bugs
    • Remote Code Execution (RCE)
    • Session Fixation
    • SQL Injection
      • SQL To RCE
    • SSRF
    • SSTI
    • Subdomain Takeover
    • Web Caching Vulnerabilities
    • WebSockets
    • XXE
      • XXE to RCE
    • Cookie Based Attacks
    • CMS
      • AEM [Adobe CMS]
    • XSSI (Cross Site Script Inclusion)
    • NoSQL injection
    • Local VS Remote Session Fixation
    • Protection
      • Security Mechanisms for Websites
      • Cookie Flags
      • SameSite Cookie Restrictions
      • Same-origin policy (SOP)
      • CSP
    • Hacking IIS Applications
    • Dependency Confusion
    • Attacking Secondary Context
    • Hacking Web Sockets
    • IDN Homograph Attack
    • DNS Rebinding Attack
    • LLM Hacking Checklist
    • Bypass URL Filtration
    • Cross-Site Path Traversal (CSPT)
    • PostMessage Security
    • Prototype Pollution
      • Client-Side Prototype Pollution
      • Server-Side prototype pollution
    • Tools-Extensions-Bookmarks
    • WAF Bypassing Techniques
    • SSL/TLS Certificate Lifecycle
    • Serialization in .NET
    • Client-Side Attacks
      • JavaScript Analysis
    • Bug Bounty Platforms/Programs
    • DNS Dangling / NS Takeover
  • ✉️API-Sec
    • GraphQL API Security Testing
      • The Basics
      • GraphQL Communication
      • Setting Up a Vulnerable GraphQL Server
      • GraphQL Hacking Tools
      • GraphQL Attack Surface
      • RECONNAISSANCE
      • GraphQL DOS
      • Information Disclosure
      • AUTHENTICATION AND AUTHORIZATION BYPASSES
      • Injection Vulnerabilities in GraphQL
      • REQUEST FORGERY AND HIJACKING
      • VULNERABILITIES, REPORTS AND EXPLOITS
      • GraphQL Hacking Checklist
    • API Recon
    • API Token Attacks
    • Broken Object Level Authorization (BOLA)
    • Broken Authentication
    • Evasive Maneuvers
    • Improper Assets Management
    • Mass Assignment Attacks
    • SSRF
    • Injection Vulnerabilities
    • Excessive Data Exposure
    • OWASP API TOP 10 MindMap
    • Scanning APIs with OWASP ZAP
  • 📱Android-AppSec
    • Setup Android App Pentesting environment on Arch
    • Setup Android App Pentesting environment on Mac M4
    • Setup Android Pentesting Environment on Debian Linux
    • Android App Fundamentals
      • Android Architecture
      • Android Security Model
      • Android App Components
        • Intents
        • Pending Intents
    • Android App Components Security Cheatsheet
    • Android App Pentesting Checklist
    • How To Get APK file for application
    • ADB Commands
    • APK structure
    • Android Permissions
    • Exported Activity Hacking
    • BroadcastReceiver Hacking
    • Content Provider Hacking
    • Signing the APK
    • Reverse Engineering APK
    • Deep Links Hacking
    • Drozer Cheat Sheet
    • SMALI
      • SMALI Cheat Sheet
      • Smali Code Patching Guide
    • Intent Redirection Vulnerability
    • Janus Vulnerability (CVE-2017-13156)
    • Task Hijacking
    • Hacking Labs
      • Injured Android
      • Hacking the VulnWebView Lab
      • Hacking InsecureBankv2 App
    • Frida Cheat Sheet
  • 📶Network-Sec
    • Networking Fundamentals
    • Open Ports Security Testing
    • Vulnerability Scanning
    • Client Side Attacks
    • Port Redirection and Tunneling
    • Password Attacks
    • Privilege Escalation [PrevEsc]
      • Linux Privilege Escalation
    • Buffer Overflow (BOF)
      • VulnServer
      • Sync Breez Enterprize
      • Crashed CTF
      • BOF for Linux
    • AV Evasion
    • Post Exploitation
      • File Transfer
      • Maintaining Access
      • Pivoting
      • Clean Up
    • Active Directory
      • Basic AD Pentesting
  • 💻Desktop AppSec
    • Thin Client vs. Thick Client
  • ☁️Cloud Sec
    • Salesforce Hacking
      • Basics
      • Salesforce SAAS Apps Hacking
    • Firebase
    • S3 Buckets Misconfigurations
    • Amazon Cognito Misconfiguraitons
  • 👨‍💻Programming
    • HTML
    • JavaScript (JS)
      • window.location object
    • Python
      • Python Tips
      • Set
        • SetMethods
    • JAVA
      • Java Essentials
      • Java Essentials Code Notes
      • Java OOP1
      • JAVA OOP Principles
        • Inheritance
        • Method Overriding
        • Abstract Class
        • Interface
        • polymorphism
        • Encapsulation
        • Composition
      • Java OOP Challenges
      • Exception Handling
    • Go
      • Go Syntax Tutorial in one file
      • Methods and Interfaces
      • Go Slices
      • Go Maps
      • Go Functions
      • Concurrency
      • Read Files
      • Write Files
      • Package
        • How to make personal Package
        • regexp Packages
        • Json
        • bufio
        • Time
      • Signals-Exit
      • Unit Testing
  • 🖥️Operating Systems
    • Linux
      • Linux Commands
      • Tools
      • Linux File System
      • Bash Scripting guide
      • tmux
      • Git
      • Install Go tools from private repositories using GitHub PAT
    • VPS
    • Burp Suite
  • ✍️Write-Ups
    • Hunting Methodology
    • API BAC leads to PII Data Disclosure
    • Misconfigured OATUH leads to Pre-Account Takeover
    • Automating Bug Bounty with GitHub Actions
    • From Recon to Reward: My Bug Bounty Methodology when Hunting on Public Bug Bounty Programs
    • Exploring Subdomains: From Enumeration to Takeover Victory
    • 0-Click Account Takeover via Insecure Password Reset Feature
    • How a Simple Click Can Lead to Account Takeover: An OAuth Insecure Implementation Vulnerability
    • The Power Of IDOR even if it is unpredictable IDs
    • Unlocking the Weak Spot: Exploiting Insecure Password Reset Tokens
    • AI Under Siege: Discovering and Exploiting Vulnerabilities
    • Inside the Classroom: How We Hacked Our Way Past Authorization on a Leading EdTech Platform
    • How We Secured Our Client’s Platform Against Interaction-Free Account Thefts
    • Unchecked Privileges: The Hidden Risk of Role Escalation in Collaborative Platforms
    • Decoding Server Behavior: The Key to Mass Account Takeover
    • Exploiting JSON-Based CSRF: The Hidden Threat in Profile Management
    • How We Turned a Medium XSS into a High Bounty by Bypassing HttpOnly Cookie
  • IOS-AppSec
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  • Static Analysis
  • Dynamic Analysis

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  1. Web-AppSec
  2. Client-Side Attacks

JavaScript Analysis

PreviousClient-Side AttacksNextBug Bounty Platforms/Programs

Last updated 7 months ago

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Static Analysis

  1. Gather JavaScript Files

1. Filter Proxy HTTP history to only show files with the js extension:
2. Within Burp Suite's Proxy HTTP history, click the Filter bar at the top of the GUI.
Burp Suite’s proxy history
3. Mark the resulting list of JavaScript files and Copy URLs
4. Save the URLs to a text file `js.txt`
5. Use `wget -i js.txt` to download them
6. Alternatively, you can use the developer tools of your browser, 
    to download files one by one:
  1. Identify Endpoints

python linkfinder.py -i 'js/*' -o result.html
python linkfinder.py -i 'js/*' -o cli
  • Bookmark this js code to extract all paths from js files

javascript:(function(){var scripts=document.getElementsByTagName("script"),regex=/(?<=(\\"|\\'|\\`))\\/[a-zA-Z0-9_?&=\\/\\-\\#\\.]*(?=(\\"|\\'|\\`))/g;const%20results=new%20Set;for(var%20i=0;i<scripts.length;i++){var%20t=scripts[i].src;""!=t&&fetch(t).then(function(t){return%20t.text()}).then(function(t){var%20e=t.matchAll(regex);for(let%20r%20of%20e)results.add(r[0])}).catch(function(t){console.log("An%20error%20occurred:%20",t)})}var%20pageContent=document.documentElement.outerHTML,matches=pageContent.matchAll(regex);for(const%20match%20of%20matches)results.add(match[0]);function%20writeResults(){results.forEach(function(t){document.write(t+"<br>")})}setTimeout(writeResults,3e3);})();
  • This OneLiner extracts all API endpoints from AngularJS & Angular JavaScript files

curl -s URL |grep-Po "(\\)(?:[a-zA-Z\\-_\\:\\.0-9\\(\\]+))(V)*(?:[a-zA-Z\\-1:\\.0-9\\(\\]+))(\\)((?:[a-zA-Z\\-_\\1:1.0-9\\(\\+)" I sort -u
  1. Detect Secrets

  • With truffelhog tool

./trufflehog filesystem ~/Downloads/js --no-verification --include-detectors="all"
  • With Burp

// BChecks
https://github.com/PortSwigger/BChecks/blob/main/other/tokens/Certain-leaks-checker.bcheck
https://github.com/PortSwigger/BChecks

// Extention
JSMiner
  • Manually Extract Endpoints and Paths

- Identify all JS files by browsing the target’s functionalities and interacting with buttons and forms.
Extract JS Files in Burp Suite

- Use Burp Suite's HTTP history to filter and save in-scope JavaScript files (without Base64 encoding).
Identify Unique Endpoints

- Select at least 10 endpoints, focusing on those with variables (like IDs).
Pattern Recognition with Regex

- Observe endpoint patterns in JS files; create regex to match these patterns and automate discovery.
Automated Extraction Tools

- Use tools like jsluice, endext, or xnLinkFinder to assist with endpoint extraction.
Spot Endpoint Patterns

- Identify naming conventions (e.g., get or update) and explore modifications to discover hidden endpoints.
Prioritize Critical Endpoints

- Focus on sensitive areas (e.g., payments, admin) and use regex to search for secrets in these endpoints.
Advanced Fuzzing

- Extract strings within double quotes ("") and use them to fuzz for additional paths and endpoints.

Dynamic Analysis

  • Function Monitoring

monitor(FUNCTION);

// If Function Sends Json Objects function hook
var old = FUNCTION;
FUNCTION = function (ar ) {
    console.log("FUCNCTION called with arguments: " + JSON.stringify(ar));
    return old(ar);
}

// monitor Getter and Setter
monitor(location.__lookupGetter__("hash"));
monitor(location.__lookupSetter__("hash"));
debug(location.__lookupGetter__("hash"));
debug(location.__lookupSetter__("hash"));

// Find Function
$("").datepicker();
  • Break Points on modifications

- Write click on the tag or attribute 
- select Break on
- Choose between options (attripute modification or asubtree modification)

Detect Outdated Liberaries with retire JS

Search for their exploit in

🕸️
Javascript Analysis
JavaScript Analysis for Pentesters
https://chromewebstore.google.com/detail/retirejs/moibopkbhjceeedibkbkbchbjnkadmom?hl=en
https://security.snyk.io/
How to expand your attack surface and avoid duplicatesMedium
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