CVE-2023-26557: Observable Discrepancy

April 21, 2023 (updated November 7, 2023)

io.finnet tss-lib before 2.0.0 can leak the lambda value of a private key via a timing side-channel attack because it relies on Go big.Int, which is not constant time for Cmp, modular exponentiation, or modular inverse. An example leak is in crypto/paillier/paillier.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)

References

github.com/IoFinnet/tss-lib/releases/tag/v2.0.0
github.com/bnb-chain/tss-lib/tree/v1.3.5
gitlab.com/thorchain/tss/tss-lib/-/tags/v0.1.3
medium.com/@iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b
nvd.nist.gov/vuln/detail/CVE-2023-26557

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