CVE-2023-26556

CVSS 9.1 CRITICALEPSS 0.9%CWE-203

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.1EPSS 0.9%KEV nãoPoC —Patch —

Lifecycle

21 Apr 2023Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

io.finnet tss-lib before 2.0.0 can leak a secret key via a timing side-channel attack because it relies on the scalar-multiplication implementation in Go crypto/elliptic, which is not constant time (there is an if statement in a loop). One leak is in ecdsa/keygen/round_2.go. (bnb-chain/tss-lib and thorchain/tss are also affected.)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

n/a · n/a

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References

https://github.com/bnb-chain/tss-lib/tree/v1.3.5 https://github.com/IoFinnet/tss-lib/releases/tag/v2.0.0 https://gitlab.com/thorchain/tss/tss-lib/-/tags/v0.1.3 https://medium.com/%40iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b