Vulnerability-Lookup

GHSA-4GRX-2X9W-596C

Vulnerability from github – Published: 2023-11-28 23:28 – Updated: 2023-12-14 22:50

Summary

Marvin Attack: potential key recovery through timing sidechannels

Details

The Marvin Attack is a timing sidechannel vulnerability which allows performing RSA decryption and signing operations as an attacker with the ability to observe only the time of the decryption operation performed withthe private key.

A recent survey of RSA implementations found that the Rust rsa crate is one of many implementations vulnerable to this attack.

No fixed version is available at this time.

Severity ?

5.9 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "rsa"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.9.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-385"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-11-28T23:28:25Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "The [Marvin Attack] is a timing sidechannel vulnerability which allows performing RSA decryption and signing operations as an attacker with the ability to observe only the time of the decryption operation performed withthe private key.\n\nA recent survey of RSA implementations found that the Rust `rsa` crate is one of many implementations vulnerable to this attack.\n\nNo fixed version is available at this time.\n\n[Marvin Attack]: https://people.redhat.com/~hkario/marvin/",
  "id": "GHSA-4grx-2x9w-596c",
  "modified": "2023-12-14T22:50:57Z",
  "published": "2023-11-28T23:28:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/RustCrypto/RSA/security/advisories/GHSA-c38w-74pg-36hr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/RustCrypto/RSA/issues/19#issuecomment-1822995643"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/RustCrypto/RSA"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2023-0071.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Marvin Attack: potential key recovery through timing sidechannels"
}

ghsa-4grx-2x9w-596c

Vulnerability from osv_rustsec

Published

2023-11-22 12:00

Modified

2023-12-15 14:57

Summary

Marvin Attack: potential key recovery through timing sidechannels

Details

Impact

Due to a non-constant-time implementation, information about the private key is leaked through timing information which is observable over the network. An attacker may be able to use that information to recover the key.

Patches

No patch is yet available, however work is underway to migrate to a fully constant-time implementation.

Workarounds

The only currently available workaround is to avoid using the rsa crate in settings where attackers are able to observe timing information, e.g. local use on a non-compromised computer is fine.

References

This vulnerability was discovered as part of the "Marvin Attack", which revealed several implementations of RSA including OpenSSL had not properly mitigated timing sidechannel attacks.

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "crypto-failure"
        ],
        "cvss": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "rsa",
        "purl": "pkg:cargo/rsa"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2023-49092",
    "GHSA-c38w-74pg-36hr",
    "GHSA-4grx-2x9w-596c"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "### Impact\nDue to a non-constant-time implementation, information about the private key is leaked through timing information which is observable over the network. An attacker may be able to use that information to recover the key.\n\n### Patches\nNo patch is yet available, however work is underway to migrate to a fully constant-time implementation.\n\n### Workarounds\nThe only currently available workaround is to avoid using the `rsa` crate in settings where attackers are able to observe timing information, e.g. local use on a non-compromised computer is fine.\n\n### References\nThis vulnerability was discovered as part of the \"[Marvin Attack]\", which revealed several implementations of RSA including OpenSSL had not properly mitigated timing sidechannel attacks.\n\n[Marvin Attack]: https://people.redhat.com/~hkario/marvin/",
  "id": "RUSTSEC-2023-0071",
  "modified": "2023-12-15T14:57:06Z",
  "published": "2023-11-22T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/rsa"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2023-0071.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/RustCrypto/RSA/issues/19#issuecomment-1822995643"
    },
    {
      "type": "WEB",
      "url": "https://people.redhat.com/~hkario/marvin/"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Marvin Attack: potential key recovery through timing sidechannels"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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