Researchers found that Tron checks signatures rather than verifying the uniqueness of the signers. The oversight creates the possibility for signers to sign twice, leading to potential security issues.
As its name suggests, multisignature wallets require multiple signers defined in an account to approve transactions and move funds, allowing the creation of joint accounts in crypto. Each signer of the account holds their own keys and the account requires a certain threshold for approving transactions.
According to the research team, the vulnerability with Tron’s multisig allows generating many valid signatures. They wrote: “We can bypass the multisig verification process by signing the same message with non-deterministic nonces of our choice. By doing so, we will be able to generate many valid different signatures for the same message by the same private key.”
According to the cybersecurity team, Tron makes sure that the signatures are unique instead of checking if the signers are unique. Because of this, signers can potentially"double vote" or sign twice. Omer Sadika, who works with dWallets, said that the fix was simple — verify the address instead of the number of signatures.The researchers noted that the vulnerability was reported to Tron back in February and was already fixed days after being reported.
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