GHSA-p53j-g8pw-4w5f

Ed25519 Signature Malleability in ed25519-java Due to Missing Scalar Range Check

Source: GitHub Advisory Database (reviewed) Moderate CVE-2020-36843

Packages

Ecosystem	Package	Affected	Fixed in
Maven	net.i2p.crypto:eddsa	<= 0.3.0	no fix listed
Maven	net.i2p:i2p	< 0.9.39	0.9.39

Details

As written in the advisory (Markdown source, shown as plain text).

The implementation of EdDSA in EdDSA-Java (aka ed25519-java) through 0.3.0 exhibits signature malleability and does not satisfy the SUF-CMA (Strong Existential Unforgeability under Chosen Message Attacks) property. This allows attackers to create new valid signatures different from previous signatures for a known message.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2020-36843 advisory
https://github.com/str4d/ed25519-java/issues/82#issue-727629226 web
https://github.com/i2p/i2p.i2p/commit/d7d1dcb5399c61cf2916ccc45aa25b0209c88712#diff-658f7b1aa34b58d27796fccdb8b756c72702d64ae44703374960f1cb… web
https://eprint.iacr.org/2020/1244 web
https://github.com/str4d/ed25519-java package