github - ghsa-w5vr-6qhr-36cc

ghsa-w5vr-6qhr-36cc

Vulnerability from github

Published

2023-08-14 21:10

Modified

2025-07-28 15:53

Severity ?

5.9 (Medium) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Summary

`ed25519-dalek` Double Public Key Signing Function Oracle Attack

Details

Versions of ed25519-dalek prior to v2.0 model private and public keys as separate types which can be assembled into a Keypair, and also provide APIs for serializing and deserializing 64-byte private/public keypairs.

Such APIs and serializations are inherently unsafe as the public key is one of the inputs used in the deterministic computation of the S part of the signature, but not in the R value. An adversary could somehow use the signing function as an oracle that allows arbitrary public keys as input can obtain two signatures for the same message sharing the same R and only differ on the S part.

Unfortunately, when this happens, one can easily extract the private key.

Revised public APIs in v2.0 of ed25519-dalek do NOT allow a decoupled private/public keypair as signing input, except as part of specially labeled "hazmat" APIs which are clearly labeled as being dangerous if misused.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "ed25519-dalek"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-50237"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-497"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-08-14T21:10:29Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "Versions of `ed25519-dalek` prior to v2.0 model private and public keys as separate types which can be assembled into a `Keypair`, and also provide APIs for serializing and deserializing 64-byte private/public keypairs.\n\nSuch APIs and serializations are inherently unsafe as the public key is one of the inputs used in the deterministic computation of the `S` part of the signature, but not in the `R` value. An adversary could somehow use the signing function as an oracle that allows arbitrary public keys as input can obtain two signatures for the same message sharing the same `R` and only differ on the `S` part.\n\nUnfortunately, when this happens, one can easily extract the private key.\n\nRevised public APIs in v2.0 of `ed25519-dalek` do NOT allow a decoupled private/public keypair as signing input, except as part of specially labeled \"hazmat\" APIs which are clearly labeled as being dangerous if misused.",
  "id": "GHSA-w5vr-6qhr-36cc",
  "modified": "2025-07-28T15:53:32Z",
  "published": "2023-08-14T21:10:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50237"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MystenLabs/ed25519-unsafe-libs"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dalek-cryptography/ed25519-dalek"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2022-0093.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "`ed25519-dalek` Double Public Key Signing Function Oracle Attack"
}

CVE-2022-50237 (GCVE-0-2022-50237)

Vulnerability from cvelistv5

Published

2025-07-28 00:00

Modified

2025-07-28 13:56

Severity ?

5.9 (Medium) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

CWE

CWE-497 - Exposure of Sensitive System Information to an Unauthorized Control Sphere

Summary

The ed25519-dalek crate before 2 for Rust allows a double public key signing function oracle attack. The Keypair implementation leads to a simple computation for extracting a private key.

References

▼	URL	Tags
	https://rustsec.org/advisories/RUSTSEC-2022-0093.html
	https://github.com/MystenLabs/ed25519-unsafe-libs
	https://crates.io/crates/ed25519-dalek

Impacted products

	Vendor	Product	Version
	dalek-cryptography	ed25519-dalek	Version: 0 < 2

Show details on NVD website

JSON

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                "role": "CISA Coordinator",
                "timestamp": "2025-07-28T13:56:03.251889Z",
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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