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The buyer of an option can overpay #234

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code423n4 opened this issue May 14, 2022 · 1 comment
Closed

The buyer of an option can overpay #234

code423n4 opened this issue May 14, 2022 · 1 comment
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2 (Med Risk) Assets not at direct risk, but function/availability of the protocol could be impacted or leak value bug Something isn't working duplicate This issue or pull request already exists sponsor confirmed Sponsor agrees this is a problem and intends to fix it (OK to use w/ "disagree with severity")

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@code423n4
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Lines of code

https://github.com/code-423n4/2022-05-cally/blob/1849f9ee12434038aa80753266ce6a2f2b082c59/contracts/src/Cally.sol#L224

Vulnerability details

Impact

Buyers can lose funds if they overpay for an option

Proof of Concept

The code verifies msg.value >= price. The verification should be msg.value == price to ensure buyers don't overpay for their option.
https://github.com/code-423n4/2022-05-cally/blob/1849f9ee12434038aa80753266ce6a2f2b082c59/contracts/src/Cally.sol#L224

Recommended Mitigation Steps

Change >= for ==
@code423n4 code423n4 added 2 (Med Risk) Assets not at direct risk, but function/availability of the protocol could be impacted or leak value bug Something isn't working labels May 14, 2022
code423n4 added a commit that referenced this issue May 14, 2022
@code423n4
pedroais issue #234
d6d2329
@outdoteth outdoteth added the sponsor confirmed Sponsor agrees this is a problem and intends to fix it (OK to use w/ "disagree with severity") label May 15, 2022
@outdoteth
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reference issue: #84

@outdoteth outdoteth added the duplicate This issue or pull request already exists label May 15, 2022
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2 (Med Risk) Assets not at direct risk, but function/availability of the protocol could be impacted or leak value bug Something isn't working duplicate This issue or pull request already exists sponsor confirmed Sponsor agrees this is a problem and intends to fix it (OK to use w/ "disagree with severity")
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@outdoteth @code423n4