Security Knowledge Framework
  • Introduction
  • Auth Bypass
    • Python - Auth Bypass
    • NodeJS - Auth Bypass
  • Auth Bypass - 1
    • Python - Auth Bypass - 1
    • NodeJS - Auth Bypass - 1
    • Java - Auth Bypass - 1
  • Auth Bypass - 2
    • Python - Auth Bypass - 2
    • NodeJS - Auth Bypass - 2
    • Java - Auth Bypass - 2
  • Auth-bypass - 3
    • Python - Auth-bypass - 3
    • NodeJS - Auth-bypass - 3
    • Java - Auth-bypass - 3
  • Auth-bypass - Simple
    • Python - Auth-bypass - Simple
    • NodeJS - Auth-bypass - Simple
    • Java - Auth-bypass - Simple
  • Client Side Restriction Bypass
    • Python - Client Side Restriction Bypass
    • NodeJS - Client Side Restriction Bypass
    • Java - Client Side Restriction Bypass
  • Client Side Restriction Bypass - Harder
    • Python - Client Side Restriction Bypass - Harder
    • NodeJS - Client Side Restriction Bypass - Harder
    • Java - Client Side Restriction Bypass - Harder
  • Client Side Template Injection (CSTI)
    • Python - Client Side Template Injection (CSTI)
    • NodeJS - Client Side Template Injection (CSTI)
    • Java - Client Side Template Injection (CSTI)
  • Command Injection (CMD)
    • Python - Command Injection (CMD)
    • NodeJS - Command Injection (CMD)
    • Java - Command Injection (CMD)
  • Command Injection 2 (CMD-2)
    • Python - Command Injection 2 (CMD-2)
    • NodeJS - Command Injection 2 (CMD-2)
    • Java - Command Injection 2 (CMD-2)
  • Command Injection 3 (CMD-3)
    • Python - Command Injection 3 (CMD-3)
    • Java - Command Injection 3 (CMD-3)
  • Command Injection 4 (CMD-4)
    • Python - Command Injection 4 (CMD-4)
    • NodeJS - Command Injection 4 (CMD-4)
    • Java - Command Injection 4 (CMD-4)
  • Command Injection Blind (CMD-Blind)
    • Python - Command Injection Blind (CMD-Blind)
    • NodeJS - Command Injection Blind (CMD-Blind)
    • Java - Command Injection Blind (CMD-Blind)
  • Content-Security-Policy (CSP)
    • Python - Content-Security-Policy (CSP)
    • NodeJS - Content-Security-Policy (CSP)
    • Java - Content-Security-Policy (CSP)
  • CORS exploitation
    • Python - CORS exploitation
    • Java - CORS exploitation
  • Credentials Guessing
    • Python - Credentials Guessing
    • NodeJS - Credentials Guessing
    • Java - Credentials Guessing
  • Credentials Guessing - 2
    • Python - Credentials Guessing - 2
    • NodeJS - Credentials Guessing - 2
    • Java - Credentials Guessing - 2
  • Cross Site Scripting (XSS)
    • Python - XSS
    • NodeJS - XSS
    • Java - XSS
  • Cross Site Scripting - Attribute (XSS-Attribute)
    • Python - XSS-Attribute
    • NodeJS - XSS-Attribute
  • Cross Site Scripting - href (XSS-href)
    • Python - XSS-href
    • NodeJS - XSS-href
    • Java - XSS-href
  • Cross Site Scripting - DOM (XSS-DOM)
    • Python - XSS-DOM
    • NodeJS - XSS-DOM
    • Java - XSS-DOM
  • Cross Site Scripting - DOM-2 (XSS-DOM-2)
    • Python - XSS-DOM-2
    • NodeJS - XSS-DOM-2
    • Java - XSS-DOM-2
  • Cross Site Scripting - Stored (XSS-Stored)
    • Java - XSS-Stored
  • CSRF
    • Python - CSRF
    • NodeJS - CSRF
    • Java - CSRF
  • CSRF - Samesite
    • Python - CSRF-SameSite
    • NodeJS - CSRF-SameSite
    • Java - CSRF-SameSite
  • CSRF - Weak
    • Python - CSRF-Weak
    • NodeJS - CSRF-Weak
    • Java - CSRF-Weak
  • CSS Injection (CSSI)
    • Python - CSS Injection (CSSI)
    • NodeJS - CSS Injection (CSSI)
    • Java - CSS Injection (CSSI)
  • Deserialisation Java (DES-Java)
    • Java - Deserialisation Java (DES-Java)
  • Deserialisation Yaml (DES-Yaml)
    • Python - Deserialisation Yaml (DES-Yaml)
  • Deserialisation Pickle (DES-Pickle)
    • Python - Deserialisation Pickle (DES-Pickle)
  • Deserialisation Pickle 2 (DES-Pickle-2)
    • Python - Deserialisation Pickle 2 (DES-Pickle-2)
  • DoS Regex
    • Python - DoS Regex
    • NodeJS - DoS Regex
    • Java - DoS Regex
  • File upload
    • Python - File-Upload
    • NodeJS - File-Upload
    • Java - File-Upload
  • Formula Injection
    • Python - Formula Injection
    • NodeJS - Formula Injection
    • Java - Formula Injection
  • GraphQL DOS
    • Python - GraphQL DOS
  • GraphQL IDOR
    • Python - GraphQL IDOR
    • NodeJS - GraphQL IDOR
    • Java - GraphQL IDOR
  • GraphQL Injections
    • Python - GraphQL Injections
    • NodeJS - GraphQL Injections
    • Java - GraphQL Injections
  • GraphQL Introspection
    • Python - GraphQL Introspection
    • NodeJS - GraphQL Introspection
    • Java - GraphQL Introspection
  • GraphQL Mutations
    • Python - GraphQL Mutations
    • NodeJS - GraphQL Mutations
    • Java - GraphQL Mutations
  • Host Header Injection (Authentication Bypass)
    • Python - HttpOnly Session Hijacking XSS
  • HttpOnly Session Hijacking XSS
    • Python - HttpOnly Session Hijacking XSS
    • NodeJS - HttpOnly Session Hijacking XSS
    • Java - HttpOnly Session Hijacking XSS
  • Information Leakeage in Comments
    • Python - Information Leakeage in Comments
    • NodeJS - Information Leakeage in Comments
    • Java - Information Leakeage in Comments
  • Information Leakeage in Metadata
    • Python - Information Leakeage in Metadata
    • NodeJS - Information Leakeage in Metadata
    • Java - Information Leakeage in Metadata
  • Insecure Direct Object References (IDOR)
    • Python - Insecure Direct Object References (IDOR)
    • NodeJS - Insecure Direct Object References (IDOR)
    • Java - Insecure Direct Object References (IDOR)
  • JWT Null
    • Python - JWT Null
    • NodeJS - JWT Null
    • Java - JWT Null
  • JWT Secret
    • Python - JWT Secret
    • NodeJS - JWT Secret
    • Java - JWT Secret
  • Ldap Injection
    • Python - Ldap Injection
    • NodeJS - Ldap Injection
    • Java - Ldap Injection
  • Ldap Injection - harder
    • Python - Ldap Injection - harder
    • NodeJS - Ldap Injection - harder
    • Java - Ldap Injection - harder
  • Local File Inclusion 1 (LFI-1)
    • Python - Local File Inclusion 1 (LFI-1)
    • NodeJS - Local File Inclusion 1 (LFI-1)
    • Java - Local File Inclusion 1 (LFI-1)
  • Local File Inclusion 2 (LFI-2)
    • Python - Local File Inclusion 2 (LFI-2)
    • NodeJS - Local File Inclusion 2 (LFI-2)
    • Java - Local File Inclusion 2 (LFI-2)
  • Local File Inclusion 3 (LFI-3)
    • Python - Local File Inclusion 3 (LFI-3)
    • NodeJS - Local File Inclusion 3 (LFI-3)
    • Java - Local File Inclusion 3 (LFI-3)
  • Parameter Binding
    • Ruby - Parameter Binding
    • NodeJS - Parameter Binding
    • Java - Parameter Binding
  • Prototype Pollution
    • NodeJS - Prototype Pollution
  • Race Condition
    • Python - Race Condition
    • NodeJS - Race Condition
    • Java - Race Condition
  • Race Condition File-Write
    • Python - Race Condition File-Write
    • NodeJS - Race Condition File-Write
    • Java - Race Condition File-Write
  • Ratelimiting (Brute-force login)
    • Python - Ratelimiting
    • NodeJS - Ratelimiting
    • Java - Ratelimiting
  • Remote File Inclusion (RFI)
    • Python - Remote File Inclusion (RFI)
    • NodeJS - Remote File Inclusion (RFI)
    • Java - Remote File Inclusion (RFI)
  • Right To Left Override (RTLO)
    • Python - Right To Left Override (RTLO)
    • NodeJS - Right To Left Override (RTLO)
    • Java - Right To Left Override (RTLO)
  • Server Side Request Forgery (SSRF)
    • Python - Server Side Request Forgery (SSRF)
    • NodeJS - Server Side Request Forgery (SSRF)
  • Server Side Template Injection (SSTI)
    • Python - Server Side Template Injection (SSTI)
    • Java - Server Side Template Injection (SSTI)
  • Session Hijacking XSS
  • Session Puzzling
    • Python - Session Puzzling
    • NodeJS - Session Puzzling
    • Java - Session Puzzling
  • Session Management 1
    • Python - Session Management 1
  • SQLI (Union)
    • Python - SQLI (Union)
    • NodeJS - SQLI (Union)
    • Java - SQLI (Union)
  • SQLI Login Bypass
    • Python - Login Bypass
  • SQLI (Like)
    • Python - SQLI (Like)
    • NodeJS - SQLI (Like)
    • Java - SQLI (Like)
  • SQLI (Blind)
    • Python - SQLI (Blind)
    • NodeJS - SQLI (Blind)
    • Java - SQLI (Blind)
  • TLS Downgrade
    • Python - TLS Downgrade
  • Untrusted Sources (XSSI)
    • Python - Untrusted Sources (XSSI)
    • NodeJS - Untrusted Sources (XSSI)
    • Java - Untrusted Sources (XSSI)
  • URL Redirection
    • Python - URL Redirection
    • NodeJS - URL Redirection
    • Java - URL Redirection
  • URL Redirection - Harder
    • Python - URL Redirection - Harder
    • NodeJS - URL Redirection - Harder
    • Java - URL Redirection - Harder
  • URL Redirection - Harder-2
    • Python - URL Redirection - Harder-2
    • NodeJS - URL Redirection - Harder-2
    • Java - URL Redirection - Harder-2
  • WebSocket Message Manipulation
    • Python - WebSocket Message Manipulation
  • XML External Entity (XXE)
    • Python - XXE
    • NodeJS - XXE
    • Java - XXE
  • Exposed docker daemon
    • Python - Exposed docker daemon
  • Insecure Random
    • Python - Insecure Random
  • template item
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On this page
  • Running the app on Docker
  • Reconnaissance
  • Exploitation
  • Additional sources

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  1. Auth Bypass - 1

Java - Auth Bypass - 1

PreviousNodeJS - Auth Bypass - 1NextAuth Bypass - 2

Last updated 2 years ago

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Running the app on Docker

$ sudo docker pull blabla1337/owasp-skf-lab:java-auth-bypass1
$ sudo docker run -ti -p 127.0.0.1:5000:5000 blabla1337/owasp-skf-lab:java-auth-bypass1

Now that the app is running let's go hacking!

Reconnaissance

While most applications require authentication to gain access to private information or to execute tasks, not every authentication method is able to provide adequate security. Negligence, ignorance, or simple understatement of security threats often result in authentication schemes that can be bypassed by simply skipping the log in page and directly calling an internal page that is supposed to be accessed only after authentication has been performed.

In addition, it is often possible to bypass authentication measures by tampering with requests and tricking the application into thinking that the user is already authenticated. This can be accomplished either by modifying the given URL parameter, by manipulating the form, or by counterfeiting sessions.

Obviously, an attacker can tamper with the URL, the form or the session cookie in order to get logged in as a user without knowing the actual credentials.

The goal of this lab is to get logged in as an administrator without knowing his/her credentials

Lets start the application and register a new user

Please note that (for convenience) your password will be reset if the user already exists. Also note that the password is case sensitive.

Now that we have valid credentials, we can login:

Exploitation

We can capture the login in the burpsuite proxy and send it to the repeater. We notice that with every login, the session cookie stays the same. It is high likely that this sessionid is related to our user name:

If we quickly google for this sessionid, we find that the sessionID seems to be corresponding to 'user':

We can check whether it is a hash at https://www.tunnelsup.com/hash-analyzer/:

it seems to be a sha1...

Ok, let's lookup the hash of 'admin' at https://passwordsgenerator.net/sha1-hash-generator/

-> d033e22ae348aeb5660fc2140aec35850c4da997

Now we can set our sessionID to the sha1 hash of admin:

-> if you don't have a browser cookie manager plugin, you can go to the next step and intercept the request in burp and replace the sessionID there.

Click 'proceed' to go to the authenticated section of the application:

Additional sources

OWASP Top Ten 2017 | A5:2017-Broken Access Control | OWASP Foundation
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WSTG - Latest | OWASP Foundation
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