Document Title:
===============
Lenovo SU v5.07 - Buffer Overflow & Code Execution Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2131

Lenovo Security ID: LEN-19625

https://nvd.nist.gov/vuln/detail/CVE-2018-9063
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-9063

Acknowledgements: https://support.lenovo.com/us/fr/solutions/len-19625

News & Press References:
https://www.securityweek.com/lenovo-patches-secure-boot-vulnerability-servers
https://securityaffairs.co/wordpress/72335/security/lenovo-security-updates.html

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-9063

CVE-ID:
=======
CVE-2018-9063


Release Date:
=============
2018-07-12


Vulnerability Laboratory ID (VL-ID):
====================================
2131


Common Vulnerability Scoring System:
====================================
7.8


Vulnerability Class:
====================
Buffer Overflow


Current Estimated Price:
========================
4.000a! - 5.000a!


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a local
buffer overflow vulnerability in the official Lenovo SU v5.7.x & v5.6.x.
software.


Vulnerability Disclosure Timeline:
==================================
2018-05-03: Release Date (Lenovo)
2018-07-12: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
Lenovo
Product: SU (MapDrv - mapdrv.exe) 5.7.19, 5.6.34, 5.6.0.28 & 5.6.0.27


Exploitation Technique:
=======================
Local


Severity Level:
===============
High


Authentication Type:
====================
Restricted authentication (user/moderator) - User privileges


User Interaction:
=================
No User Interaction


Disclosure Type:
================
Responsible Disclosure Program


Technical Details & Description:
================================
A local buffer overflow and arbitrary code exeuction has been discovered
in the official Lenovo SU v5.7.x & v5.6.x. software.
The vulnerability allows to overwrite the active registers of the
process to compromise the affected software by gaining
higher system access privileges.

MapDrv (C:Program FilesLenovoSystem Update mapdrv.exe) contains a local
vulnerability where an attacker entering very large user ID
or password can overrun the programas buffer, causing undefined
behaviors, such as execution of arbitrary code. No additional privilege is
granted to the attacker beyond what is already possessed to run MapDrv.
The flaw could be exploited by local attackers for different kind
of attacks, include the execution of arbitrary code on the target machine.

Exploitation of the local buffer overflow vulnerability requires no user
interaction and system user process privileges of the driver.
Successful exploitation of the buffer overflow vulnerability results in
a compromise of the local system process or affected computer system.

Vulnerable Driver:
[+] MapDrv

Affected Process:
[+] mapdrv.exe


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by local attackers with system
process privileges and without user interaction.
For security demonstration or to reproduce the vulnerability follow the
provided information and steps below.


--- Debug Error Exception Session Log (Exception) ---
(d8c.1988): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=029ab7a0 ebx=0031fe05 ecx=00000041 edx=fd974860 esi=029a9d70
edi=0031fd04
eip=00a256b3 esp=0031e54c ebp=0031fc70 iopl=0         nv up ei pl nz na
pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000
efl=00210206
*** ERROR: Module load completed but symbols could not be loaded for
image00a20000
image00a20000+0x56b3:
00a256b3 66890c02        mov     word ptr [edx+eax],cx
ds:0023:00320000=0000

--- Debug Session Log [Exception Analysis] ---
FAULTING_IP:
image00a20000+56b3
00a256b3 66890c02        mov     word ptr [edx+eax],cx

EXCEPTION_RECORD:  ffffffff -- (.exr ffffffffffffffff)
ExceptionAddress: 00a256b3 (image00a20000+0x000056b3)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000001
   Parameter[1]: 00320000
Attempt to write to address 00320000

FAULTING_THREAD:  00001988
PROCESS_NAME:  image00a20000
FAULTING_MODULE: 77ab0000 ntdll
DEBUG_FLR_IMAGE_TIMESTAMP:  594b6578
ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx
referenced memory at 0x%08lx. The memory could not be %s.
WRITE_ADDRESS:  00320000
BUGCHECK_STR:  ACCESS_VIOLATION

IP_ON_HEAP:  00410041
The fault address in not in any loaded module, please check your build's
rebase
log at <releasedir>binbuild_logstimebuildntrebase.log for module which may
contain the address if it were loaded.

DEFAULT_BUCKET_ID:  WRONG_SYMBOLS
FRAME ONE INVALID: 1800200000000a
LAST_CONTROL_TRANSFER:  from 00410041 to 00a256b3

STACK_TEXT:
WARNING: Stack unwind information not available. Following frames may be
wrong.
0031fc70 00410041 00410041 00410041 00410041 image00a20000+0x56b3
0031fc74 00410041 00410041 00410041 00410041 0x410041
0031fc78 00410041 00410041 00410041 00410041 0x410041
0031fc7c 00410041 00410041 00410041 00410041 0x410041
0031fc80 00410041 00410041 00410041 00410041 0x410041
0031fc84 00410041 00410041 00410041 00410041 0x410041
0031fc88 00410041 00410041 00410041 00410041 0x410041
0031fc8c 00410041 00410041 00410041 00410041 0x410041
0031fc90 00410041 00410041 00410041 00410041 0x410041
0031fc94 00410041 00410041 00410041 00410041 0x410041
0031fc98 00410041 00410041 00410041 00410041 0x410041
0031fc9c 00410041 00410041 00410041 00410041 0x410041
0031fca0 00410041 00410041 00410041 00410041 0x410041
0031fca4 00410041 00410041 00410041 00410041 0x410041
0031fca8 00410041 00410041 00410041 00410041 0x410041
0031fcac 00410041 00410041 00410041 00410041 0x410041
0031fcb0 00410041 00410041 00410041 00410041 0x410041
0031fcb4 00410041 00410041 00410041 00410041 0x410041
0031fcb8 00410041 00410041 00410041 00410041 0x410041
0031fcbc 00410041 00410041 00410041 00410041 0x410041
0031fcc0 00410041 00410041 00410041 00410041 0x410041
0031fcc4 00410041 00410041 00410041 00410041 0x410041
0031fcc8 00410041 00410041 00410041 00410041 0x410041
0031fccc 00410041 00410041 00410041 00410041 0x410041
0031fcd0 00410041 00410041 00410041 00410041 0x410041
0031fcd4 00410041 00410041 00410041 00410041 0x410041
0031fcd8 00410041 00410041 00410041 00410041 0x410041
0031fcdc 00410041 00410041 00410041 00410041 0x410041
0031fce0 00410041 00410041 00410041 00410041 0x410041
0031fce4 00410041 00410041 00410041 00410041 0x410041
0031fce8 00410041 00410041 00410041 00410041 0x410041
0031fcec 00410041 00410041 00410041 00410041 0x410041
0031fcf0 00410041 00410041 00410041 00410041 0x410041
0031fcf4 00410041 00410041 00410041 00410041 0x410041
0031fcf8 00410041 00410041 00410041 00410041 0x410041
0031fcfc 00410041 00410041 00410041 00410041 0x410041
0031fd00 00410041 00410041 00410041 00410041 0x410041
0031fd04 00410041 00410041 00410041 00410041 0x410041
0031fd08 00410041 00410041 00410041 00410041 0x410041
0031fd0c 00410041 00410041 00410041 00410041 0x410041
0031fd10 00410041 00410041 00410041 00410041 0x410041
0031fd14 00410041 00410041 00410041 00410041 0x410041
0031fd18 00410041 00410041 00410041 00410041 0x410041
0031fd1c 00410041 00410041 00410041 00410041 0x410041
0031fd20 00410041 00410041 00410041 00410041 0x410041
0031fd24 00410041 00410041 00410041 00410041 0x410041
0031fd28 00410041 00410041 00410041 00410041 0x410041
0031fd2c 00410041 00410041 00410041 00410041 0x410041
0031fd30 00410041 00410041 00410041 00410041 0x410041
0031fd34 00410041 00410041 00410041 00410041 0x410041
0031fd38 00410041 00410041 00410041 00410041 0x410041
0031fd3c 00410041 00410041 00410041 00410041 0x410041
0031fd40 00410041 00410041 00410041 00410041 0x410041
0031fd44 00410041 00410041 00410041 00410041 0x410041
0031fd48 00410041 00410041 00410041 00410041 0x410041
0031fd4c 00410041 00410041 00410041 00410041 0x410041
0031fd50 00410041 00410041 00410041 00410041 0x410041
0031fd54 00410041 00410041 00410041 00410041 0x410041
0031fd58 00410041 00410041 00410041 00410041 0x410041
0031fd5c 00410041 00410041 00410041 00410041 0x410041
0031fd60 00410041 00410041 00410041 00410041 0x410041
0031fd64 00410041 00410041 00410041 00410041 0x410041
0031fd68 00410041 00410041 00410041 00410041 0x410041
0031fd6c 00410041 00410041 00410041 00410041 0x410041
0031fd70 00410041 00410041 00410041 00410041 0x410041
0031fd74 00410041 00410041 00410041 00410041 0x410041
0031fd78 00410041 00410041 00410041 00410041 0x410041
0031fd7c 00410041 00410041 00410041 00410041 0x410041
0031fd80 00410041 00410041 00410041 00410041 0x410041
0031fd84 00410041 00410041 00410041 00410041 0x410041
0031fd88 00410041 00410041 00410041 00410041 0x410041
0031fd8c 00410041 00410041 00410041 00410041 0x410041
0031fd90 00410041 00410041 00410041 00410041 0x410041
0031fd94 00410041 00410041 00410041 00410041 0x410041
0031fd98 00410041 00410041 00410041 00410041 0x410041

PRIMARY_PROBLEM_CLASS:  STACK_CORRUPTION

FOLLOWUP_IP:
image00a20000+56b3
00a256b3 66890c02        mov     word ptr [edx+eax],cx

SYMBOL_STACK_INDEX:  0
FOLLOWUP_NAME:  MachineOwner
MODULE_NAME: image00a20000
IMAGE_NAME:  image00a20000
SYMBOL_NAME:  image00a20000+56b3
STACK_COMMAND:  ~0s ; kb
BUCKET_ID:  WRONG_SYMBOLS

Followup: MachineOwner
---------
0:000> lmvm image00a20000
start    end        module name
00a20000 00bd2000   image00a20000   (no symbols)
    Loaded symbol image file: C:Program FilesLenovoSystem Updatemapdrv.exe
    Image path: image00a20000
    Image name: image00a20000
    Timestamp:        Wed Jun 21 23:36:40 2017 (594B6578)
    CheckSum:         001BA113
    ImageSize:        001B2000
    File version:     1.0.0.1
    Product version:  1.0.0.1
    File flags:       0 (Mask 3F)
    File OS:          4 Unknown Win32
    File type:        1.0 App
    File date:        00000000.00000000
    Translations:     0409.04b0
    ProductName:      Map Network Drive
    InternalName:     mapdrv
    OriginalFilename: mapdrv.exe
    ProductVersion:   1, 0, 0, 1
    FileVersion:      1, 0, 0, 1
    FileDescription:  Map Network Drive Application
    LegalCopyright:   Copyright Lenovo 2005, 2006, all rights reserved.
Copyright IBM Corporation 1996-2005, all rights reserved.


Solution - Fix & Patch:
=======================
Update Lenovo System Update to version 5.07.0072 or later. You can
determine the currently installed version by
opening Lenovo System Update, clicking on the green question mark in the
top right corner and then selecting aAbout.a

Lenovo System Update can be updated by choosing either of the following
methods:

Lenovo System Update automatically checks for a later version whenever
the application is run.
Click OK when prompted that a new version is available.
To manually update, download the latest version from the following URL:
https://support.lenovo.com/en/documents/ht080136


Security Risk:
==============
The security risk of the buffer overflow and arbitrary code execution
vulnerability is estimated as high.


Credits & Authors:
==================
S.AbenMassaoud -
https://www.vulnerability-lab.com/show.php?user=S.AbenMassaoud


Disclaimer & Information:
=========================
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