Title: Delta Industrial Automation DCISoft 1.12.09 Stack Buffer Overflow Exploit
Advisory ID: ZSL-2016-5305
Type: Local/Remote
Impact: System Access, DoS
Risk: (4/5)
Release Date: 14.02.2016

Summary

DCISoft is a integrated configuration tool of Delta network modules (DVPEN01-SL, RTU-EN01, IFD9506, IFD9507, DVPSCM12-SL, DVPSCM52-SL) for WINDOWS operation system.

Description

The vulnerability is caused due to a boundary error in the processing of a project file, which can be exploited to cause a stack based buffer overflow when a user opens e.g. a specially crafted .DCI file. Successful exploitation allows execution of arbitrary code on the affected machine.

--------------------------------------------------------------------------------

(1554.1830): Access violation - code c0000005 (!!! second chance !!!)
eax=00000001 ebx=0018f684 ecx=44444444 edx=777a4a20 esi=0018f65c edi=777a4a20
eip=73d34b64 esp=0018cdd8 ebp=0018cdec iopl=0 nv up ei pl nz na po nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010202
MFC42!Ordinal2740+0x88:
73d34b64 8b01 mov eax,dword ptr [ecx] ds:002b:44444444=????????
0:000> d esp
0018cdd8 1c f6 18 00 a8 a5 47 00-01 00 00 00 01 00 00 00 ......G.........
0018cde8 5c f6 18 00 fc cd 18 00-a4 59 41 00 e1 b5 85 88 \........YA.....
0018cdf8 5c f6 18 00 d8 f8 18 00-fa 38 41 00 84 f6 18 00 \........8A.....
0018ce08 c8 8f 74 02 e8 1f 7c 02-04 ce 18 00 c8 8f 74 02 ..t...|.......t.
0018ce18 04 ce 18 00 44 44 44 44-44 44 44 44 44 44 44 44 ....DDDDDDDDDDDD
0018ce28 44 44 44 44 44 44 44 44-44 44 44 44 44 44 44 44 DDDDDDDDDDDDDDDD
0018ce38 44 44 44 44 44 44 44 44-44 44 44 44 44 44 44 44 DDDDDDDDDDDDDDDD
0018ce48 44 44 44 44 44 44 44 44-44 44 44 44 44 44 44 44 DDDDDDDDDDDDDDDD
--
(11bc.1394): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
Defaulted to export symbols for C:\Program Files (x86)\Delta Industrial Automation\Communication\DCISoft 1.12\MFC42.DLL -
eax=0018cdfc ebx=0018f684 ecx=0018cdec edx=ce085164 esi=0018f65c edi=31f7ae9c
eip=43434343 esp=0018cdcc ebp=0018cdec iopl=0 nv up ei pl nz ac pe cy
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210217
43434343 ?? ???

--------------------------------------------------------------------------------

Vendor

Delta Electronics, Inc. - http://www.delta.com.tw

Affected Version

1.12.09 (Build 12102014)

Tested On

Microsoft Windows 7 Professional SP1 (EN)
Microsoft Windows 7 Ultimate SP1 (EN)

Vendor Status

[13.11.2015] Vulnerability discovered.
[15.11.2015] Contact with the vendor.
[16.11.2015] Vendor responds asking more details.
[17.11.2015] Sent details to the vendor.
[20.11.2015] Asked vendor for status update.
[20.11.2015] Vendor forwards details to developers.
[05.12.2015] Asked vendor for status update.
[09.12.2015] Vendor responds, working on the issue.
[16.01.2016] Asked vendor for status update.
[11.02.2016] No response from the vendor.
[12.02.2016] Asked vendor for status update.
[14.02.2016] No response from the vendor.
[14.02.2016] Public security advisory released.

PoC

dcisoft_bof.py

Credits

Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>

References

[1] https://packetstormsecurity.com/files/135745
[2] https://cxsecurity.com/issue/WLB-2016020133
[3] https://www.exploit-db.com/exploits/39443/
[4] https://exchange.xforce.ibmcloud.com/vulnerabilities/110589

Changelog

[14.02.2016] - Initial release
[15.02.2016] - Added reference [3]
[16.02.2016] - Added reference [4]

Contact

Zero Science Lab

Web: http://www.zeroscience.mk
e-mail: lab@zeroscience.mk