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PBLang Information Disclosure, Privileges Escalation and Cross Site
Scripting
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SUMMARY
" <http://pblang.drmartinus.de/> PBLang is a powerful flatfile Bulletin
Board System. It combines many features of a professional board, but does
not even require SQL support. It is completely based on text-file."
PBLang has been discovered to contain multiple vulnerabilities, these
vulnerabilities allow a remote attacker to disclose sensitive information,
to escalate his privileges and to cause cross side scripting.
DETAILS
Vulnerable Systems:
* PBLang version 4.65 and prior
Information Disclosure Vulnerability:
sendpm.php contains a flaw that allows a registered user to view other
users' password hashes, as well as their PM's and other files in the forum
(and outside of the forum directory too).
Exploit:
By using the following URL:
http://example.com/pblang/sendpm.php?to=[username]&subj=[doesnt
matter]&num=1&orig=/home/public_html/pblang/db/members/[username]
It will load [username]'s entire account information including the MD5'ed
password hash and maybe hidden email information. It will be shown in web
page's source code, not in the page itself, so right click and view page
source. This method allows accessing any file in the system using web
server's privileges, including /etc/passwd.
Privilege Escalation Vulnerability:
Flaws in delpm.php allow any registered user to delete anyone else's PM's
as long as their logged in (doesn't need to be privileged). This could
allow unprivileged users to harass other users.
Exploit:
The following URL can be used to test your system for the mentioned
vulnerability:
http://localhost/pblang/delpm.php?id=[PMID]&a=[Target user name]
Cross Side Scripting:
The module pmpshow.php shows the PMs a user has received, however, the
body of the received PM is not checked for any harmful characters like < >
and ".
Exploit:
Type in the body of the PM your going to send a victim.
"<script language="javascript">alert("XSS");</script>"
An alert box saying "XSS" should pop up.
In addition, the modules pm.php and search.php are also vulnerable to
cross side scripting.
ADDITIONAL INFORMATION
The information has been provided by <mailto:raven@tgs-security.com>
Raven.
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In no event shall we be liable for any damages whatsoever including direct,
indirect, incidental, consequential, loss of business profits or special
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