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Old 07-19-2020, 16:34
Windoze Windoze is offline
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Alternate Approach to FlexLM Brute-Force

Hello,

I was looking through the old leaked FlexLM v9.2 source and had an idea...

What we want is LM_SEED1 - 3 but they are nowhere in the shipped files.
But we can get ENCRYPTION_SEED1 and ENCRYPTION_SEED2 from the target.
They are directly generated from the LM_SEEDS via a FIPS186 random generator.
The algorithm used in this RNG is SHA1. This should be much faster to brute force than the elliptic curve crypto.

Did anyone try this approach before? Do you think this is possible?

- Windoze
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Old 08-17-2020, 19:44
Vladimir Vladimir is offline
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Yes, surely it seems be any approach to solve problem.

I had a similar project on my desk that uses Flexlm 11.x, I tried doing Brute-F but when I got the estimated time , the numbers were jaw dropping.

I had IDA sig along with til for major of Flexlm function(which i planned to release on exetools very soon if every thing goes well.)
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  #3  
Old 08-20-2020, 22:06
nathan nathan is offline
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Did you actually give it a try or it is just an high level idea so far ?
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Old 08-20-2020, 22:08
nathan nathan is offline
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And may be this could be a good starting point https://forum.exetools.com/showthread.php?t=19605
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Old 08-21-2020, 00:46
Windoze Windoze is offline
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Quote:
Originally Posted by nathan View Post
Did you actually give it a try or it is just an high level idea so far ?
It's just an idea at the moment
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