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yabb.txt

yabb.txt
Posted Sep 13, 2000
Authored by Kostas Petrakis | Site synnergy.net

Yabb 9.1.2000 and prior for Windows and Unix is a web based BBS system which has a vulnerability in YaBB.pl which allows remote attackers to view any file on the system.

tags | exploit, remote, web
systems | windows, unix
SHA-256 | b2141b021a48b28bf0bb81210dfbaa6fe7aae1817ab3d9c84bb3511551d57e91

yabb.txt

Change Mirror Download

*************************************************
+ YaBB 9.1.2000 Multiple Vulnerabilities +
*************************************************
# Advisory by pestilence #
# www.synnergy.net #
|===============================================|



Affected program: YABB 9.1.2000 (previous ?)
System : Linux, UNIX, Windows
Problem : Problem located in all scripts that handle
files.
Discovery : pestilence@synnergy.net

Discussion
----------
YaBB is the internet's second Open Source Bulletin Board system. A
Bulletin Board is software to add interactivity to your site. Someone
can post a question, which other visitors can answer. A bulletin board
keeps your visitors coming back
This product can be downloaded from http://www.yabb.org


Vulnerability
-------------
1) When YaBB.pl is called with the variable $display and $num (this is

the variable that handles the file) it opens a file without any security

check for reading, allthough the script that is responsible for handling

the file, appends a .txt extension, a user is able to force the script
to
open any file he wants by adding %00 to the end of the request, thus
forcing the script to ommit the .txt extension.
The problem is located within the Display.pl script:

sub Display {
$viewnum = $INFO{'num'};
open(FILE, "$vardir/membergroups.txt");
&lock(FILE);
@membergroups = <FILE>;
&unlock(FILE);
close(FILE);
open(FILE, "$datadir/$viewnum.txt") || &fatal_error("$txt{'23'}

Note that the program is subject to more Vulnerabities as most of the
scripts that handle user input don't do any security checks (even the
basic ones).


For instance:
http://www.my_target.com/cgi-bin/YaBB.pl?board=news&action=display&num=../../../../../../../../etc/passwd%00

. will open the passwd file.

Solution
--------

The vendors have been informed of the bug.

Wait for the next patched version of YaBB to be released.

----------------------------------------
WEB: http://www.synnergy.net
email: pestilence@synnergy.net
Kostas Petrakis aka Pestilence
----------------------------------------
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