Scammers are using a “zero-value transfer” programming loophole to deceive users into sending them crypto.
Data from Etherscan shows that some crypto scammers are targeting users with a new trick that allows them to confirm a transaction from the victim’s wallet, but without having the victim’s private key. The attack can only be performed for transactions of 0 value. However, it may cause some users to accidentally send tokens to the attacker as a result of cutting and pasting from a hijacked transaction history.the new technique in December and revealed it in a blog post.
For example, if the victim sent 100 coins to an exchange deposit address, the attacker may send zero coins from the victim’s wallet to an address that looks similar but that is, in fact, under the control of the attacker. The victim may see this transaction in their transaction history and conclude that the address shown is the correct deposit address. As a result, they may send their coins directly to the attacker.
However, there is a loophole in this restriction. The allowed amount is defined as a number , which means it is interpreted as zero unless it is specifically set to some other number. This can be seen in the “allowance” function.
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