[ISN] RSI.0009.09-08-98.ALL.OMNIBACK

From: mea culpa (jerichoat_private)
Date: Tue Sep 08 1998 - 17:40:34 PDT

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                       Repent Security Incorporated, RSI
                           [ http://www.repsec.com ]
    		       *** RSI ALERT ADVISORY ***
    --- [CREDIT] --------------------------------------------------------------
    'Bermuda Brian': Research and development
    Mark Zielinski : Author of advisory
    --- [SUMMARY] -------------------------------------------------------------
    Announced:     August 18, 1998
    Report code:   RSI.0009.09-08-98.HP-UX.OMNIBACK
    Report title:  Omniback
    Vulnerability: Several vulnerabilities have been discovered
                   which can allow an attacker to execute remote commands,
                   impersonate another user, and overwrite any file
                   on the server.
    Vendor status: Hewlett Packard contacted on August 18, 1998  
    Patch status:  Patches are being developed by Hewlett Packard
    Platforms:     Any platform with the Omniback package installed
    Reference:     http://www.repsec.com/advisories.html
    Impact:        If exploited, users can execute commands and
                   gain root access remotely, and overwrite any file
                   on the system locally.
    Special Note:  Although Omniback is not known to be shipped with
                   any operating system, many platforms are supported 
                   by the Omniback software package according to 
                   Installation of Omniback on any system could
                   potentially leave you vulnerable.
    --- [DETAILS] -------------------------------------------------------------
    Problem:       Three problems are covered in this advisory:
                     The first issue allows an attacker to remotely
                     execute commands on the server by sending arbitrary
                     data with a ";" after commands such as "CELL" 
                     or "INFO".
                     The second issue also allows remote execution of commands
                     by impersonating a valid user and Omniback server.
                     The third issue allows for any file on the system
                     to be overwritten locally via a /tmp symlink problem.
                   These problems are present in the 2.1, and 2.5
                   Omniback Cell servers, disk agents, and media agents.
                   The Omniback protocol is vulnerable to spoofing attacks
                   which introduces these vulnerabilities:
                   Vulnerability #1:  Omniback allows commands to be executed
                                      with root access since it requires full
                                      access to the local filesystem.
                                      By sending arbitrary data to the Omniback
                                      server containing commands such as
                                      "CELL;command" or "INFO;command", 
                                      an attacker can execute commands as root.
                   Vulnerability #2:  Omniback also allows remote commands to 
                                      be executed through a second process.
                                      Any user that can impersonate the
                                      Omniback Cell server can start a
                                      job on the remote system and potentially
                                      execute commands as root.
                   Vulnerability #3:  Omniback allows an arbitrary local user
                                      overwrite any file on the filesystem.
                                      By symlinking /tmp/util.tmp to
                                      the file you want to create/overwrite
                                      and sending the Omniback server an
                                      UNSECURE command, you can potentially
                                      create/overwrite that file.
                   This software has also been ported to a number of other
                   platforms which are currently untested, but may
                   be subject to the same vulnerabilities:
                     SGI IRIX 5.3
                     SNI Sinix 5.4.2
                     IBM AIX 3.2.5, 4.1
                     Hewlett Packard HP-UX 9.0, 10.0, 10.20, 11.0               
                     Sun Microsystems SunOS 4.1.3, 4.1.4, 5.3, 5.4, 5.5, 5.6
                     Novell Netware 3.11, 3.12, 4.01, 4.1
                     Microsoft Windows NT Server & Workstation 3.51, 4.0
                     Further platforms can be included via NFS and shared disks
    --- [FIX] -----------------------------------------------------------------
    Solution:      The following temporary solutions exist to help deal with the
                   above issues, however each solution may not be best suited
                   for your network or adequately deal with the problems.
                   Adding access controls to 'inetd.sec' could potentially 
                   limit the scope of a network attack, but would not be 
                   considered a complete or failsafe solution.
                   Blocking port 5555 at the external router of your network
                   will defend against most Internet based attacks, but could
                   potentially interfere with other applications that may use
                   port 5555 such as 'personal-agent'. Current IANA port 
                   assignments include a note (in comments) that HP Omniback
                   also uses this port, but does not specifically assign it
                   to the Omniback service. This solution will not protect you 
                   from internal/Intranet attacks.
                   The last solution is to disable Omniback until a patch
                   is provided by your vendor.
    --- [PATCH] ---------------------------------------------------------------
    Solution:      HP has informed us that patches are in process to address 
                   issues #1 and #3.
    Repent Security Incorporated (RSI)
    13610 N. Scottsdale Rd.
    Suite #10-326
    Scottsdale, AZ 85254
    E-Mail: adviseat_private
    FTP: ftp://ftp.repsec.com
    WWW: http://www.repsec.com
    Version: 2.6.2
    Copyright September 1998  RepSec, Inc.
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