SingleNativeTokenExitV2 doesn't take input deadline to consideration

[code423n4]

Handle

kenzo

Vulnerability details

SingleNativeTokenExitV2 takes as input from the user a deadline for the trades.
However, it does not use this input for the actual trade but sets the deadline to be block.timestamp.

Impact

Trades will not work as expected. User might set a deadline for the trade but his trade will get executed regardless.

Duplicate issue?

This issue is present in a few contracts in the repo - SingleNativeTokenExitV2, SingleTokenJoinV2.
If I submit both in one issue, but the judge will decide to reward them separately, he would not be able to do so for me as I submitted them all in one issue.
So this is why I am submitting them in separate issues.
If it is will be rewarded only as one issue, the judge will close the duplicate. Thank you.

Proof of Concept

We can see the input struct has deadline as a parameter, however, _exit passes as deadline block.timestamp, and not the input deadline.

Recommended Mitigation Steps

Send to the router _exitTokenStruct.deadline instead of block.timestamp. (Code ref)

[loki-sama]

duplicate #112

[0xleastwood]

Duplicate of #47