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CVE-2023-26557

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Date: April 21, 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.)

Language: Go

Severity Score

Related Resources (7)

https://medium.com/@iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b
https://github.com/bnb-chain/tss-lib/tree/v1.3.5
https://nvd.nist.gov/vuln/detail/CVE-2023-26557
https://github.com/IoFinnet/tss-lib/releases/tag/v2.0.0
https://medium.com/%40iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b
https://gitlab.com/thorchain/tss/tss-lib/-/tags/v0.1.3
https://www.mend.io/vulnerability-database/CVE-2023-26557

Severity Score

Weakness Type (CWE)

Observable Discrepancy

CWE-203

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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