Flexlm ECC alternate patching methods
 

After the v8.01 release, I know only 2 ways to bypass ECC protection in Flexlm license manager:
1) a binary patch to force "the good guy" at the end of of _lm_pubverify
2) a binary patch that forces the license manager to use the no ECC option for checking out licenses

I want to state that has been quite a while since I worked on that, however, I was wondering if anyone has ever considered to build patches based on the obsucated signature that you can find inside the binary.

For instance I analize the vendor_struc and I can fish out the obfuscated signature used for the handshaking between the client and daemon. The interesting part of it is that the signature is unique for any product and it could be easily found by hex searching.

I was wondering if it would be possible to write a personalized daemon with the correct seed1-2 and our own ECC and inject the personalized ECC sig inside the binary and generate licenses accordingly.

Any thoughs ? Am I missing somting fundamental here ?

Thnx,

nathan

Does (2) still work after V10.5?. I was told it had been defeated.

Git

It may be the case ... I haven't tested it ... however, what do you think about the injection idea ?

I don't know enough about ECC to comment, sorry.

Git

I think the inject idea can work fine.
I try this in Synplicity's software.

You need found the init section and patch it to your ECC init code.

in this way, only the static data session would be changed...

I beat the feature check on 11.4. It loads the any features with any number of licenses and and expiration date regardless of checksum.

MrGneissGuy's

Can you elaborate a little on which method you used?

(Patch 1 or 2, or the suggested injection of the personalized ECC code?)

Regards,

RCER

Try this little toy by Mammoth/ZWT :)

MIME-Version: 1.0
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Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="patch.exe"

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@nathan
the idea you mentioned is possible to work. actually i did it in another way but i got same result. i made a daemon which work ok. by finding correct infos and set in lm_code.h you can compile a daemon with different ecc seeds which work same as original daemon. it was for long time ago, but as i remember a special kind of license needed too. in this way even if program itself check ecc signature rather than daemon, verification still will return true.

@toro: yes the idea can work indeed ... plus it's quite useful to build a database of ECC signatures which help the patch right away. I've been out for quite a long time but I'm back to exercise now XD

patch the pubkey data is another method.
and as far as i know, patch ECDSA data is the most powerful method. this can defeat any platform and any version FlexLM in second.

@swlepus:how ro patch ecdsa?

Search in the forum, "arlequim" has made a good patcher for vendors v10.5--11.9...
But in some cases doesn't work.. You need to find manually the flexlm ECC routine inside the vendor/exe/dll.....

still ok£¬£¬