28 Jul '15, 2pm

Disclosure by @pwuille: a Bitcoin consensus bug that was indirectly solved by BIP66

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello all, I'd like to disclose a vulnerability I discovered in September 2014, which became unexploitable when BIP66's 95% threshold was reached earlier this month. ## Short description: A specially-crafted transaction could have forked the blockchain between nodes: * using OpenSSL on a 32-bit systems and on 64-bit Windows systems * using OpenSSL on non-Windows 64-bit systems (Linux, OSX, ...) * using some non-OpenSSL codebases for parsing signatures ## Upgrade instructions: None. Transactions that could trigger this problem have become invalid on the network since BIP66's deployment of version 3 blocks reached 95% on July 4th, 2015. ## Long description: The problem is related to the signature encoding rules. Bitcoin's signatures are ASN.1 BER encoded. BER is a complex standard that allows many different encodings for the same...

Full article: http://lists.linuxfoundation.org/pipermail/bitcoin-dev/20...

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