CVE-2023-26556

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.)

Category

9.1
CVSS
Severity: Critical
CVSS 3.1 •
EPSS 0.30%
Affected: n/a n/a
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2023-26556?
CVE-2023-26556 has been scored as a critical severity vulnerability.
How to fix CVE-2023-26556?
To fix CVE-2023-26556, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-26556 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-26556 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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