New releases remediate reminiscence exhaustion vulnerability in Zcash

Releases 5.3.3 and 5.4.2 harden zcashd code and remediate vulnerabilities inherited from Bitcoin Core which will have affected greater than 280 chains, in response to blockchain safety agency Halborn.

We’ve no proof that an exploit has occurred on the Zcash community, and these bugs don’t compromise person privateness or influence Zcash provide. As at all times, when you discover any uncommon exercise in your node, please report it to [email protected]

All Zcash node operators on 5.3.1 or 5.3.2 ought to replace to five.3.3 instantly, and all Zcash node operators on 5.4.0 or 5.4.1 ought to replace to five.4.2 instantly. Prebuilt binaries and Debian packages shall be out there within the subsequent few hours.

The vulnerabilities, found by Halborn in a 2022 audit of Dogecoin, have been first disclosed to ECC and contributors to different affected networks on Feb. 14, and extra particulars have been relayed in a Feb. 17 name. ECC initiated our safety course of instantly and started coordinating with ZecSec.com, the impartial Zcash-community-funded safety staff, and with Zcash Basis, who analyzed the influence on zebrad, its personal implementation of a Zcash node. We additionally reached out to Horizen, Komodo, and different groups with whom we have now disclosure agreements.

Inside days, we had zcashd patches prepared for third-party testing, however the public releases have been delayed to permit different initiatives time to finish their very own remediations and to permit for coordinated comms, given the delicate nature.

Halborn discovered that the bugs might enable an attacker to make the most of peer-to-peer community messages to fill the reminiscence of a node and crash it. By crashing different individuals’s mining nodes, an attacker might probably cut back, by round one half, the quantity of hashpower they would wish to mount a 51% assault on the Zcash community. A profitable 51% assault might probably be used to execute a double-spend assault, which might end in customers who obtained transactions from the attackers shedding their funds. We’ve no motive to consider that the Zcash community is at present susceptible to a 51% assault — with or with out the “one half low cost” on the assault price — however out of an abundance of warning, we’ve hardened the zcashd nodes in order that they can’t be crashed utilizing this bug.

ECC has a report of quick, coordinated responses to incidents like this and is well-known for delivering secure and safe know-how for Zcash customers and different privacy-minded initiatives. For our newest information and product updates, please observe @electriccoinco on Twitter.