ed0e1e4d44
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95 lines
No EOL
2.5 KiB
Text
95 lines
No EOL
2.5 KiB
Text
Source: http://aluigi.org/adv/fxscover_1-adv.txt
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#######################################################################
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Luigi Auriemma
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Application: Microsoft Fax Cover Page Editor
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http://windows.microsoft.com/en-US/windows-vista/Create-or-edit-a-fax-cover-page
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Versions: <= 5.2.3790.3959
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Platforms: Windows
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Bug: double free
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Exploitation: local
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Date: 19 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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Fax Cover Page Editor is a program for the viewing and editing of
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various formats of fax cover files.
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#######################################################################
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======
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2) Bug
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======
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fxscover.exe is available on Windows after the installation of the Fax
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Service.
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The various "Text" elements have a 16bit field that seems used to index
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them and by default it has a negative value like 0x8001.
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By using a positive value major than 0 and lower than the total number
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of elements is possible to cause a problem during the freeing of the
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allocated object.
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The provided proof-of-concept demonstrates the possibility of executing
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code immediately after the acknoledgement of the initial message box
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when is called FXSCOVER!CDrawDoc::Remove by
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FXSCOVER!CDrawDoc::DeleteContents.
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Modifications:
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00005098 FE CC // code execution starts from here
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000093F5 01 04 // 16bit in little endian
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000093F6 80 00
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Alternatively is also possible to exploit the bug when the program gets
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closed or another file is opened by modifying the 16 bit at offset
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0x94a5 instead of the one at 0x93f5, so that the file will be
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considered valid.
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#######################################################################
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===========
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3) The Code
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===========
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DoS:
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http://aluigi.org/poc/fxscover_1.cov
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/16024-fxscover_1.cov
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Bind Shell:
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/fxscover_1_bind28876.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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####################################################################### |