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I am searching for security vulnerabilities in the firmware of this router, its architecture is mips. I have successfully unpacked the file system. I would like to disassemble the http daemon, located at /usr/sbin/httpd. How can I disassemble this program and run it in spim?

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3 Answers 3

You can give a try to radare2. It has a pretty complete support for MIPS, and provides a lot functionalities to help during the reversing process.

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Can you please tell me how? I'm new to reversing. –  caffinatedmonkey Apr 8 at 19:39
    
I have been attempting to use radare2 for MIPS, and it was pretty dodgy (not analysing MIPSEL code, etc.) until I submitted several patches, so use a recent github version –  6EQUJ5 Jun 4 at 5:42
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Are you sure that you need spim ?

I'd suggest to use qemu instead of spim for emulation, radare2 for disassembly as @jvoisin mentioned and

retargetable decompiler for decompilation if you really need it.

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I would like to second the suggestion of QEMU.

Craig has a post describing how to debug a MIPS binary running in QEMU using IDA:

http://www.devttys0.com/2011/09/exploiting-embedded-systems-part-3/

(you can also use GDB or another debugger speaking the GDB protocol)

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All of these are such good answers I don't know which one to accept! Thank you all for helping me out :D –  caffinatedmonkey Apr 9 at 13:50
    
That's the best answer because it contains link to tutorial. –  w s Apr 9 at 14:38
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