CVE-2023-26556
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).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.86%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.86% probability · 57th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-203
- Affected
- iofinnet/tss-lib
- Source
- cve@mitre.org
References
- https://github.com/IoFinnet/tss-lib/releases/tag/v2.0.0Release Notes
- https://github.com/bnb-chain/tss-lib/tree/v1.3.5Product
- https://gitlab.com/thorchain/tss/tss-lib/-/tags/v0.1.3Release Notes
- https://medium.com/%40iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b
- https://github.com/IoFinnet/tss-lib/releases/tag/v2.0.0Release Notes
- https://github.com/bnb-chain/tss-lib/tree/v1.3.5Product
- https://gitlab.com/thorchain/tss/tss-lib/-/tags/v0.1.3Release Notes
- https://medium.com/%40iofinnet/security-disclosure-for-ecdsa-and-eddsa-threshold-signature-schemes-4e969af7155b
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.