@stake advisory: 4D WebSTAR Multiple Vulnerabilities

["Advisories" <advisories () atstake com>]

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                                @stake, Inc.
                              www.atstake.com
                             Security Advisory
Advisory Name: WebSTAR 5.3.2 Multiple Vulnerabilities 
 Release Date: 07/13/2004
  Application: WebSTAR 5.3.2 and below
     Platform: MacOS X 10.3.3 and below
     Severity: A remote attacker can obtain root privileges
               A remote attacker can get directory listings of 
               any directory
               A remote attacker can obtain copies of the PHP 
               configuration file  
               A local attacker can obtain root privileges
       Author: Dave G. <daveg () atstake com>
Vendor Status: Upgrade with fix available
CVE Candidate: Candidate number applied for
    Reference: www.atstake.com/research/advisories/2004/a071302-1.txt

Overview: 
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: 
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
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

@stake Recommendation:  
Upgrade to WebSTAR 5.3.3.

Common Vulnerabilities and Exposures (CVE) Information:
The Common Vulnerabilities and Exposures (CVE) project has assigned 
the following names to these issues.  These are candidates for 
inclusion in the CVE list (http://cve.mitre.org), which standardizes 
names for security problems.
  Candidate number applied for.
@stake Vulnerability Reporting Policy: 
http://www.atstake.com/research/policy/
@stake Advisory Archive: 
http://www.atstake.com/research/advisories/
PGP Key:
http://www.atstake.com/research/pgp_key.asc

Copyright 2004 @stake, Inc. All rights reserved.
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