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[PNM-002] The expiry of the parent node can be smaller than the one of a child node, violating the guarantee policy

🗓️ 19 Jul 2022 00:00:00Reported by Code4renaType 
code423n4
 code423n4🔗 github.com👁 11 Views

The expiry of the parent node can be smaller than the one of a child node, violating the guarantee policy. To setSubnodeOwner / setSubnodeRecord, the new expiry can only be extended up to the current one. The problem occurs when unwrapping a node, the oldExpiry becomes zero, and there is no constraint on the expiry of the sub-domain. The hacker can then re-wrap the sub-domain with a smaller expiry, relaxing the constraint

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27 Jul 2022 00:00Current
7High risk
Vulners AI Score7
parent nodechild nodeexpiryguarantee policyenssub-domainconstraintunwrappinghackerroot causepocattack scenariofixnamewrappersolidityethereumdns-packethardhat
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