ed0e1e4d44
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116 lines
No EOL
4 KiB
Text
116 lines
No EOL
4 KiB
Text
Source: http://aluigi.org/adv/msreader_4-adv.txt
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#######################################################################
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Luigi Auriemma
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Application: Microsoft Reader
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http://www.microsoft.com/reader
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Versions: <= 2.1.1.3143 (PC version)
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<= 2.6.1.7169 (Origami version)
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the non-PC versions have not been tested
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Platforms: Windows, Windows Mobile, Tablet PC and UMPC devices
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Bug: array overflow
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Date: 11 Apr 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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Microsoft Reader is a software needed to read and catalog the ebooks in
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LIT format and the Audible audio books bought via internet, indeed the
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homepage acts also as online store for these protected contents.
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#######################################################################
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======
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2) Bug
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======
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Array overflow in the AOLL chunk caused by the usage of more sections
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than those available:
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0107F59B |. 8B43 14 MOV EAX,DWORD PTR DS:[EBX+14] ; our number
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0107F59E |. 8BF1 MOV ESI,ECX
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0107F5A0 |. 8BF8 MOV EDI,EAX
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0107F5A2 |. 8B8E A4000000 MOV ECX,DWORD PTR DS:[ESI+A4]
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0107F5A8 |. C1E7 02 SHL EDI,2
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0107F5AB |. 833C39 00 CMP DWORD PTR DS:[ECX+EDI],0 ; check the array, must be != 0
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0107F5AF 75 0C JNZ SHORT msreader.0107F5BD
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0107F5B1 |. 50 PUSH EAX
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0107F5B2 |. 8BCE MOV ECX,ESI
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0107F5B4 |. E8 36F5FFFF CALL msreader.0107EAEF ; alternative memory corruption
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0107F5B9 |. 85C0 TEST EAX,EAX
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0107F5BB |. 7C 34 JL SHORT msreader.0107F5F1
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0107F5BD |> 8B86 A4000000 MOV EAX,DWORD PTR DS:[ESI+A4]
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0107F5C3 |. 8B3C38 MOV EDI,DWORD PTR DS:[EAX+EDI]
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0107F5C6 |. 8D43 20 LEA EAX,DWORD PTR DS:[EBX+20]
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0107F5C9 |. 57 PUSH EDI
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0107F5CA |. 50 PUSH EAX
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0107F5CB |. E8 EAC9FEFF CALL msreader.0106BFBA
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...
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0106BFBA /$ 8B4424 08 MOV EAX,DWORD PTR SS:[ESP+8]
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0106BFBE |. FF70 04 PUSH DWORD PTR DS:[EAX+4] ; must point to our data
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0106BFC1 |. FF7424 08 PUSH DWORD PTR SS:[ESP+8]
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0106BFC5 |. E8 36E8FFFF CALL msreader.0106A800
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...
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0106A800 /$ 56 PUSH ESI
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0106A801 |. 8B7424 0C MOV ESI,DWORD PTR SS:[ESP+C]
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0106A805 |> 85F6 /TEST ESI,ESI
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0106A807 |. 74 21 |JE SHORT msreader.0106A82A ; must be a valid memory address
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0106A809 |. FF76 20 |PUSH DWORD PTR DS:[ESI+20]
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0106A80C |. FF7424 0C |PUSH DWORD PTR SS:[ESP+C]
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0106A810 |. E8 75180100 |CALL msreader.0107C08A
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0106A815 |. 59 |POP ECX
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0106A816 |. 85C0 |TEST EAX,EAX
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0106A818 |. 59 |POP ECX
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0106A819 |. 74 05 |JE SHORT msreader.0106A820 ; EAX must be 0
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0106A81B |. 8B76 10 |MOV ESI,DWORD PTR DS:[ESI+10]
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0106A81E |.^EB E5 \JMP SHORT msreader.0106A805
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0106A820 |> 8B06 MOV EAX,DWORD PTR DS:[ESI]
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0106A822 |. 56 PUSH ESI
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0106A823 |. FF50 04 CALL DWORD PTR DS:[EAX+4] ; code execution
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Modified bytes in the proof-of-concept:
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00000744 03 0A ; dynamic 64bit number, any value >= 4 (for this PoC) exploits the bug
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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/poc/msreader_4.zip
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/17163.zip
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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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####################################################################### |