In the ERC20 contract used to define the interface for tranche tokens the permit function uses ecrecover to verify a signature submitted by the token owner to approve an address to spend its tranche tokens. However there is a well known issue related to signature malleability where if the r and s values are observed they can be used to craft another valid signature on the other side of the elliptic curve (1).
This would allow any attacker that observers a permit call to a LiquidityPoolβs share token, as is done in requestRedeemWithPermit to be able to create a new valid signature approving a malicious address which they can use to transfer the tokens to themselves before the redemption request is executed on the centrifuge chain.
Manual review
Implement the OpenZeppelin ECDSA library in order to restrict signatures to one side of the elliptic curve.
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