[NEWS] 4D WebSTAR Multiple Vulnerabilities

From: SecuriTeam (support_at_securiteam.com)
Date: 07/14/04

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Date: 14 Jul 2004 10:24:59 +0200

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      4D WebSTAR Multiple Vulnerabilities
    ------------------------------------------------------------------------

    SUMMARY

    4D WebSTAR is a software product that provides Web, FTP, and Mail services
    for Mac OS X. There are numerous vulnerabilities that allow for an
    attacker to escalate privileges or obtain access to protected resources.

    DETAILS

    Vulnerable Systems:
     * WebSTAR version 5.3.2 and prior

    Immune Systems:
     * WebSTAR version 5.3.3

    Issue #1: Remotely Exploitable Pre-Authentication FTP overflow
    There is a stack based buffer overflow within the FTP service. An attacker
    can take advantage of this overflow by sending in a long FTP command. This
    can happen prior to authentication. A long FTP command will trigger a
    stack based memory trespass. Upon successful exploitation, an attacker
    will have the privileges of the 'webstar' user and group id 'wheel'. An
    attacker can gain administrative privileges by taking advantage of Issue
    #4.

    Issue #2: Directory Indexing of Any Directory on Host
    One of the sample scripts included with WebSTAR
    (/cgi-bin/ShellExample.cgi) can be used to gain a directory listing of any
    directory on the server. This is done by sending in a path to the
    directory followed by an asterisk ("*") as the query string. Issue

    #3: File Disclosure of PHP.INI
    There is a vulnerability within the WebServer that allows an attacker to
    download the php.ini files located within the /cgi-bin and /fcgi-bin
    directories. This can contain sensitive information about the WebServer
    and the Database Server, potentially including the account and password
    used by PHP to communicate with the database.

    Issue #4: Local Privilege Escalation and File Overwrite Via Symbolic Links
    WebSTAR will attempt to open up files via a relative path from the current
    working directory. An attacker can use this vulnerability to overwrite
    files with the private key of the WebServer. Due to a default umask that
    creates files with global read and write privileges, an attacker create
    files related to the cron subsystem that will allow a local attacker to
    obtain administrative privileges.

    Disclosure Timeline:
    Vendor notified: 04/05/2004
    Fix available: 07/08/2004
    Advisory released: 07/13/2004

    Vendor Response:
    4D has released an upgrade for 4D WebSTAR. Download WebSTAR 5.3.3:
     <ftp://ftp.4d.com/products/webstar/current/4d_webstar_v/4d_webstar_v.sit>
    ftp://ftp.4d.com/products/webstar/current/4d_webstar_v/4d_webstar_v.sit

    Bug Fix information [URL wraps]:
     
    <ftp://ftp.4d.com/ACI_PRODUCT_REFERENCE_LIBRARY/4D_PRODUCT_DOCUMENTATION/PDF_Docs_by_4D_Product_A-Z/4D_WebSTAR/Software_Change_History.txt> ftp://ftp.4d.com/ACI_PRODUCT_REFERENCE_LIBRARY/4D_PRODUCT_DOCUMENTATION/PDF_Docs_by_4D_Product_A-Z/4D_WebSTAR/Software_Change_History.txt

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:advisories@atstake.com>
    @Stake Advisories.
    The original article can be found at:
    <http://www.atstake.com/research/advisories/2004/a071302-1.txt>
    http://www.atstake.com/research/advisories/2004/a071302-1.txt

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