[NEWS] RPC-3 Telnet Host Authentication Bypassing

From: SecuriTeam (support_at_securiteam.com)
Date: 04/05/05

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    Date: 5 Apr 2005 13:26:49 +0200
    
    

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      RPC-3 Telnet Host Authentication Bypassing
    ------------------------------------------------------------------------

    SUMMARY

    Bay Technical Associates'
    <http://www.baytechdcd.com/products/rpcseries.shtml> RPC-3 Telnet Host is
    a telnet daemon, used by many hardware appliances, mostly for power
    supplies solutions.

    When a user logs into RPC-3 Telnet Host he can bypass authentication
    mechanism and gain full control over the device by sending it a malformed
    username.

    DETAILS

    Vulnerable Systems:
     * RPC-3 Telnet Host - Revision F3.05

    When a user logs into this telnet daemon he is able to gain full control
    of the device (in this example a power supply). This vulnerability could
    allow an unauthorized user to login to a power supply, and disable power
    to a machine, thereby completely shutting down and disabling the
    aforementioned machine (or anything else connected to such a power
    supply).

    To carry out this exploit an attacker simply needs to telnet to the RPC-3
    Telnet daemon on the standard telnet port, and when prompted for the
    username hit the escape key, and then enter. The attacker will then be
    logged into the Telnet Daemon.

    Example:
    RPC-3 Telnet Host
    Revision F 3.05, (C) 1998
    Bay Technical Associates
    Unit ID: RPC3

    Enter username> [escape key] [enter]
    Login successful.

    Available RPC3 Outlets
    For command summary, enter HELP

    Circuit Breaker: On

    Selection Outlet Outlet Power
    Number Name Number Status

    ADDITIONAL INFORMATION

    The information has been provided by Flare@CiSO.

    ========================================

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