Crouzet em4 soft 1.1.04 Integer Division By Zero
Vendor: Crouzet Automatismes SAS
Product web page: http://www.crouzet-automation.com
Affected version: 1.1.04 and 1.1.03.01
Summary: em4 is more than just a nano-PLC. It is a leading
edge device supported by best-in-class tools that enables
you to create and implement the smartest automation applications.
Desc: em4 soft suffers from a division by zero attack when handling
Crouzet Logic Software Document '.pm4' files, resulting in denial
of service vulnerability and possibly loss of data.
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(187c.1534): Integer divide-by-zero - code c0000094 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
*** WARNING: Unable to verify checksum for image013b0000
*** ERROR: Module load completed but symbols could not be loaded for image013b0000
eax=00000000 ebx=00000000 ecx=55c37c10 edx=00000000 esi=0105b13c edi=0110bb18
eip=013ea575 esp=0064d8b8 ebp=0064d8f4 iopl=0 nv up ei pl nz na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210206
image013b0000+0x3a575:
013ea575 f7bf18010000 idiv eax,dword ptr [edi+118h] ds:002b:0110bc30=00000000
0:000> u
image013b0000+0x3a575:
013ea575 f7bf18010000 idiv eax,dword ptr [edi+118h]
013ea57b 8d4de0 lea ecx,[ebp-20h]
013ea57e c745fc00000000 mov dword ptr [ebp-4],0
013ea585 50 push eax
013ea586 6808505b01 push offset image013b0000+0x205008 (015b5008)
013ea58b 51 push ecx
013ea58c ff15b0575a01 call dword ptr [image013b0000+0x1f57b0 (015a57b0)]
013ea592 8b870c010000 mov eax,dword ptr [edi+10Ch]
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Tested on: Microsoft Windows 7 Professional SP1 (EN)
Microsoft Windows 7 Ultimate SP1 (EN)
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience
Advisory ID: ZSL-2016-5309
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5309.php
25.01.2016
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PoC:
http://zeroscience.mk/codes/poc5309.pm4.zip
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39509.zip
