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This document contains information regarding the response to a critical vulnerability applicable to miners of Bitcoin Cash using Bitcoin-ABC 0.17.0. Appropriate action has been taken to mitigate the impact of this vulnerability. This document is provided for information purposes only.
Bitcoin ABC 0.17.1 fixes this problem.
On 26APR2016 Bitcoin-ABC developers were notified by unknown person(s) of the vulnerability. If exploited the flaw would have caused an unintended split in the Bitcoin Cash network.
## Description
An attacker may construct a malicious transaction which would be accepted by Bitcoin-ABC 0.17.0 and mined into a block. This block would be rejected by all other versions of Bitcoin Cash compliant implementations.
## Impact
BUCash and versions of Bitcoin-ABC prior to 0.17.0 could be split from
the majority Bitcoin Cash blockchain. Only Bitcoin ABC and BUCash nodes were included in the analysis of this vulnerability.
## Mitigation
After analysis of the vulnerability and possible responses, Bitcoin-ABC developers prepared a patch for the vulnerability, and a private release, to distribute directly to mining pool operators. Due to the decentralized nature of the mining community it was not possible to reach everyone directly. This release was provided to verified Bitcoin Cash miners to forward to additional miners once they had upgraded.
We advise any Bitcoin ABC 0.17.0 users to upgrade to the latest version as soon as possible.
## Follow-up
Bitcoin ABC will be taking several actions in order to prevent such an event from occurring again, as well
