[UNIX] PBLang Information Disclosure, Privileges Escalation and Cross Site Scripting

From: SecuriTeam (support_at_securiteam.com)
Date: 03/15/05

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Date: 15 Mar 2005 15:50:41 +0200

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      PBLang Information Disclosure, Privileges Escalation and Cross Site
    Scripting
    ------------------------------------------------------------------------

    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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