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2013.Március 26.(K) 16:56 időpontban Javier Juan Martínez Cabezón ezt írta: |
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> On 26/03/13 16:45, Javier Juan Martínez Cabezón wrote: |
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>> On 26/03/13 16:11, "Tóth Attila" wrote: |
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>> |
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>>> |
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>>> I wonder how these ROP techniques can theoretically perform in a |
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>>> java virtual machine? What are the possbile target vectors for |
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>>> Python or Ruby? What about JIT code? |
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>> |
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>> http://www.grant-olson.net/python/pyasm |
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> I'm not sure if I understood you wrongly, do you want mean how can |
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> someone do ROP in python? or how a python script could be objetive of a |
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> ROP attack? |
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|
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I ment: how to do ROP in python and how a compiled python script can be an |
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objective of a ROP attack? If the attacker carefuly studies the way how |
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exactly the script becomes executable code in memory, it gains control on |
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a mechanism to plant the necessary pre-designed snippets needed for the |
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actual exploit. |
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We saw the exploit hardening software of the guy in the presentation |
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video. If they can succesfully analyse given language like java or python, |
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they could find a way to pre-create the code fragments they need. There |
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could be an additional phase for designing and implanting these. If the |
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runtime environment has a flaw, they may gain full or partial control over |
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the location as well. So that means less probing would be necessary and |
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the mechanism would be much faster. |
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|
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> Python is linked against libc too, and finally it finish being executed |
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> in machine (assembler) code, the main difference is that C for example |
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> needs compilation, python scripts "are compiled" on the fly. |
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I could also mention other languages, like python. Those who deal with |
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scripts or partially compiled interim formats. I don't have internal |
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information about these. But I suspect that address randomization of the |
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run-time generated code was not considered as a focus of interest. There |
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can be numerous weaknesses (even by design) in such languages. If the |
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attacker figures out the way to get through the execution process, there |
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will be endless victims out there to exploit. |
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I'm not a professional computer scientist, so I'm sorry if I use some tech |
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words inappropriately. |
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-- |
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dr Tóth Attila, Radiológus, 06-20-825-8057 |
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Attila Toth MD, Radiologist, +36-20-825-8057 |
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