The developer spoke about the vulnerability of Wumbo channels in the Bitcoin Lightning Network
The developer Yust Jager, who specializes in the Bitcoin scaling solution Lightning Network, said that the recent addition of the so-called Wumbo channels to the network has opened a new vulnerability in it. According to him, the attack does not require a lot of effort or allocation of a large amount..
Support for Wumbo Channels was introduced to the Lightning Network in August. They remove the restrictions originally set by the developers on the bandwidth, which allows transferring larger amounts of bitcoin on the second level of the network.
The bug that Yager discovered in Wumbo channels is that they are unable to store more than 483 hashes and time-locked contracts (HTLCs) at the same time, despite the higher bandwidth. Thus, an attacker can send 483 micropayments to his own address and use up the available resources to block the channel for up to two weeks..
In an experiment, Yager found that by using the maximum path length and repetitive payments, you can achieve your goal very quickly. “If the creator of the script is lucky, he will only need to send 54 payments. One tiny channel is removing double-digit amounts in bitcoin from circulation, ”he writes..
Jager has already started developing the fix, but so far he cannot boast of the results. “If we talk about how big this vulnerability is, then there are other attacks, because of which you can lose money. They seem more serious. But this vulnerability is one of the biggest in the sense that we do not know how to fix it, “he wrote..
Bitfinex announced the addition of support for Wumbo channels on Tuesday.
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