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  • Smart Contracts Security
    • Code 4 Rena
      • High Risk Findings
        • Anyone Can Pass Any Proposal
        • Arithmetic Rounding
        • Can Vote Multiple Times By Transferring NFT In Same Block As Proposal
        • Never Ending Proposal
        • Reusing Signatures
        • Signature Verification Can Be Bypass With Zero Address
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      • Low Risk Non Critical
        • Dont Check If Some Entity Actually Exists
      • Medium Risk Findings
        • Bypass Signature Validity Check
        • Copy Of Lack Of Verification In Hashes
        • Function May Run Out Of Gas Leading To Loss
        • Incorrect Initialization Of Smart Contracts With Access Control Issue
        • Invalid Signature Lead To Access Control
        • Lack Of Checks If One Entity Get Hacked
        • Lack Of Verification In Hashes
        • Missing Upper Limit
        • Missing Zero Address Checks
        • Possible Dos Because Unbounded Loop Can Run Out Of Gas
        • Too Much Trust To Certain Roles
        • Unreversable Actions
        • Useless Nft
  • T.I.L.
    • 16 09 22
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  • Summary:
  • Mitigation:
  1. Smart Contracts Security
  2. Code 4 Rena
  3. Medium Risk Findings

Bypass Signature Validity Check

Submitted by (3) cryptphi, also found by 0x1f8b and defsec

Summary:

https://code4rena.com/reports/2022-08-rigor/#m-03-signature-checks-could-be-passed-when-signaturedecoderrecoverkey-returns-0

It is possible to pass Signature Validity check with an SignatureDecoder.recoverKey() returns 0 whenever the builder and /or contractor have an existing approved hash for a data.

Mitigation:

There should be a require check for _recoveredSignature != 0 in checkSignatureValidity().

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Last updated 1 year ago