[NT] Microsoft Windows LPC Heap Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 01/11/05

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Date: 11 Jan 2005 14:06:07 +0200

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      Microsoft Windows LPC Heap Overflow
    ------------------------------------------------------------------------

    SUMMARY

    A local privilege elevation vulnerability exists on the Windows operating
    systems' LPC mechanism. This vulnerability allows any user to take
    complete control over the system and affects Windows NT, Windows 2000,
    Windows XP, and Windows 2003 (all service packs).

    DETAILS

    The LPC (Local Procedure Call) mechanism is a type of interprocess
    communication used by the Windows operating systems. LPC is used to
    communicate between processes running on the same system while RPC (Remote
    Procedure Call) is used to communicate between processes on remote
    systems.

    When a client process communicates with a server using LPC, the kernel
    fails to check that the server process has allocated enough memory before
    copying data sent by the client process. The native API used to connect to
    the LPC port is NtConnectPort. A parameter of the NtConnectPort API allows
    a buffer of up 260 bytes. When using this function the buffer is copied by
    the kernel from the client process to the server process memory ignoring
    the buffer size restriction which the server process set when calling
    NtCreatePort (the native API used to create LPC ports). This causes a heap
    corruption in the server process allowing arbitrary memory to be
    overwritten and can lead to arbitrary
    code execution.

    Solution:
    See solution provided at:
    <http://www.microsoft.com/technet/security/bulletin/MS04-044.mspx>
    http://www.microsoft.com/technet/security/bulletin/MS04-044.mspx

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:vrathod@appsecinc.com> Team
    SHATTER (Application Security, Inc.).
    The original article can be found at:
    <http://www.appsecinc.com/resources/alerts/general/07-0001.html>
    http://www.appsecinc.com/resources/alerts/general/07-0001.html

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