Script Name: JAB Guest Book
Authors: [EMAIL PROTECTED]
Website: James Barnsley
Bug Report: NetJackal (nj[AT]hackerz[DOT]ir & nima_501[AT]yahoo[DOT]com)
Status: Patch not released
First i should apologize for my bad english.
Intro:
JAB Guest Book is a free guest book written in PHP, it works using flat
files
to store data which means no database is needed. Features include easy
installation
and customisation into your existing website. An administration panel which
allows
you to delete posts and ban users, additional administration configuration to
un-ban
users and to use the bad word filter. Ability for users to post messages with
topic,
email and comments including emotions (smilies). The main guest book works
completely
using only one file.
Bugs Description:
look at pbguestbook.php at line 425:
function invalideregtest($input)
{
$checkcount = 0;
//$exinput = str_split($input);
$countname = count($exinput);
for($i=0; $i<$countname; $i++)
{
if(!ereg("[A-Za-z0-9]", $input[$i]) == 1)
{
$checkcount++;
}
}
if($checkcount != 0)
{
$input = "no";
}
else
{
$input = "yes";
}
return($input);
}
$check1 = invalideregtest($topic);
script just check $topic by invalideregtest function. so what's happen
if we put some thing lile
<SCRIPT SRC=http://Hacler/EVIL.js></script> in $author? yes true answer xss
happens
Solution:
Edit the code and check other inputs by invalideregtest function or
simply remove html tags by
strip_tags function (PHP built-in function)
