MEDIUM4.3

GHSA-p53j-g8pw-4w5f

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

Quick fix

GHSA-p53j-g8pw-4w5f — net.i2p:i2p: upgrade to the fixed version with the command below.

# pom.xml: bump <version>0.9.39</version> for net.i2p:i2p

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

Maven/net.i2p.crypto:eddsa

Introduced in: 0

No fixed version published yet for net.i2p.crypto:eddsa (maven). Pin to a known-safe version or switch to an alternative.

Maven/net.i2p:i2p

Introduced in: 0Fixed in: 0.9.39

Fix# pom.xml: bump <version>0.9.39</version> for net.i2p:i2p

References

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-658f7b1aa34b58d27796fccdb8b756c72702d64ae44703374960f1cb89a5a5c3[WEB]
https://eprint.iacr.org/2020/1244[WEB]
https://github.com/str4d/ed25519-java[PACKAGE]