[UNIX] JSBoard Arbitrary File Reading

From: SecuriTeam (support_at_securiteam.com)
Date: 01/23/05

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Date: 23 Jan 2005 16:07:40 +0200

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      JSBoard Arbitrary File Reading
    ------------------------------------------------------------------------

    SUMMARY

     <http://kldp.net/projects/jsboard/> JSBoard is "one of most widely used
    web BBS applications in Korea".

    Due to improper input filtering by JSBoard a remote attacker can include
    arbitrary local files in the response the server returns, thus disclosing
    them.

    DETAILS

    Vulnerable Systems:
     * JSBoard version 2.0.9 and prior

    Immune Systems:
     * JSBoard version 2.0.10 or newer

    PHP has a feature that will discard any input values containing NULL
    characters whenever the item magic_quotes_gpc has been set to off. Because
    JSBoard session.php doesn't sanitize the $table variable, a malicious
    attacker can use it read arbitrary files.

    Vulnerable code:
    include_once "include/print.php";
    parse_query_str();
    $opt = $table ? "&table=$table" : "";
    $opts = $table ? "?table=$table" : "";
    ..snip...

    Proof of Concept:
    http://[victim]/session.php?logins=true&m=logout&table=../../../../../../etc/passwd%00

    Solution:
    Upgrade to JSBoard version 2.0.10 or newer, available from:
    <http://kldp.net/frs/download.php/1729/jsboard-2.0.10.tar.gz>
    http://kldp.net/frs/download.php/1729/jsboard-2.0.10.tar.gz

    Disclosure Timeline:
    2004-12-31 Vulnerability found.
    2004-12-31 JSBoard developer notified.
    2005-01-02 Developer confirmed.
    2005-01-02 Update version released.
    2005-01-20 Official release.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:advisory@stgsecurity.com>
    SSR Team.

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