cvelistv5 - cve-2024-45337

cve-2024-45337

Vulnerability from cvelistv5

Published

2024-12-11 18:55

Modified

2024-12-12 01:30

Severity ?

Summary

Misuse of ServerConfig.PublicKeyCallback may cause authorization bypass in golang.org/x/crypto

References

▼	URL	Tags
	security@golang.org	https://github.com/golang/crypto/commit/b4f1988a35dee11ec3e05d6bf3e90b695fbd8909
	security@golang.org	https://go.dev/cl/635315
	security@golang.org	https://go.dev/issue/70779
	security@golang.org	https://groups.google.com/g/golang-announce/c/-nPEi39gI4Q/m/cGVPJCqdAQAJ
	security@golang.org	https://pkg.go.dev/vuln/GO-2024-3321
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2024/12/11/2

Impacted products

Vendor

Product

Version

▼

golang.org/x/crypto

golang.org/x/crypto/ssh

Version: 0 ≤

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-12-12T01:30:22.551Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2024/12/11/2"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/crypto/ssh",
          "product": "golang.org/x/crypto/ssh",
          "programRoutines": [
            {
              "name": "ServerConfig.PublicKeyCallback"
            }
          ],
          "vendor": "golang.org/x/crypto",
          "versions": [
            {
              "lessThan": "0.31.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Damien Tournoud (Platform.sh / Upsun)"
        },
        {
          "lang": "en",
          "value": "Patrick Dawkins (Platform.sh / Upsun)"
        },
        {
          "lang": "en",
          "value": "Vince Parker (Platform.sh / Upsun)"
        },
        {
          "lang": "en",
          "value": "Jules Duvivier (Platform.sh / Upsun)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Applications and libraries which misuse the ServerConfig.PublicKeyCallback callback may be susceptible to an authorization bypass."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-1108: Excessive Reliance on Global Variables",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-11T18:55:58.506Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/issue/70779"
        },
        {
          "url": "https://go.dev/cl/635315"
        },
        {
          "url": "https://github.com/golang/crypto/commit/b4f1988a35dee11ec3e05d6bf3e90b695fbd8909"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/-nPEi39gI4Q/m/cGVPJCqdAQAJ"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2024-3321"
        }
      ],
      "title": "Misuse of ServerConfig.PublicKeyCallback may cause authorization bypass in golang.org/x/crypto"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2024-45337",
    "datePublished": "2024-12-11T18:55:58.506Z",
    "dateReserved": "2024-08-27T19:41:58.555Z",
    "dateUpdated": "2024-12-12T01:30:22.551Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-45337\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2024-12-12T02:02:07.970\",\"lastModified\":\"2024-12-12T02:15:24.673\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Applications and libraries which misuse the ServerConfig.PublicKeyCallback callback may be susceptible to an authorization bypass.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://github.com/golang/crypto/commit/b4f1988a35dee11ec3e05d6bf3e90b695fbd8909\",\"source\":\"security@golang.org\"},{\"url\":\"https://go.dev/cl/635315\",\"source\":\"security@golang.org\"},{\"url\":\"https://go.dev/issue/70779\",\"source\":\"security@golang.org\"},{\"url\":\"https://groups.google.com/g/golang-announce/c/-nPEi39gI4Q/m/cGVPJCqdAQAJ\",\"source\":\"security@golang.org\"},{\"url\":\"https://pkg.go.dev/vuln/GO-2024-3321\",\"source\":\"security@golang.org\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2024/12/11/2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}

ghsa-v778-237x-gjrc

Vulnerability from github

Published

2024-12-11 22:03

Modified

2024-12-11 22:03

Summary

Misuse of ServerConfig.PublicKeyCallback may cause authorization bypass in golang.org/x/crypto

Details

Applications and libraries which misuse the ServerConfig.PublicKeyCallback callback may be susceptible to an authorization bypass.

The documentation for ServerConfig.PublicKeyCallback says that "A call to this function does not guarantee that the key offered is in fact used to authenticate." Specifically, the SSH protocol allows clients to inquire about whether a public key is acceptable before proving control of the corresponding private key. PublicKeyCallback may be called with multiple keys, and the order in which the keys were provided cannot be used to infer which key the client successfully authenticated with, if any. Some applications, which store the key(s) passed to PublicKeyCallback (or derived information) and make security relevant determinations based on it once the connection is established, may make incorrect assumptions.

For example, an attacker may send public keys A and B, and then authenticate with A. PublicKeyCallback would be called only twice, first with A and then with B. A vulnerable application may then make authorization decisions based on key B for which the attacker does not actually control the private key.

Since this API is widely misused, as a partial mitigation golang.org/x/cry...@v0.31.0 enforces the property that, when successfully authenticating via public key, the last key passed to ServerConfig.PublicKeyCallback will be the key used to authenticate the connection. PublicKeyCallback will now be called multiple times with the same key, if necessary. Note that the client may still not control the last key passed to PublicKeyCallback if the connection is then authenticated with a different method, such as PasswordCallback, KeyboardInteractiveCallback, or NoClientAuth.

Users should be using the Extensions field of the Permissions return value from the various authentication callbacks to record data associated with the authentication attempt instead of referencing external state. Once the connection is established the state corresponding to the successful authentication attempt can be retrieved via the ServerConn.Permissions field. Note that some third-party libraries misuse the Permissions type by sharing it across authentication attempts; users of third-party libraries should refer to the relevant projects for guidance.

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "golang.org/x/crypto"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.31.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-45337"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-285"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-12-11T22:03:04Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "Applications and libraries which misuse the ServerConfig.PublicKeyCallback callback may be susceptible to an authorization bypass.\n\nThe documentation for ServerConfig.PublicKeyCallback says that \"A call to this function does not guarantee that the key offered is in fact used to authenticate.\" Specifically, the SSH protocol allows clients to inquire about whether a public key is acceptable before proving control of the corresponding private key. PublicKeyCallback may be called with multiple keys, and the order in which the keys were provided cannot be used to infer which key the client successfully authenticated with, if any. Some applications, which store the key(s) passed to PublicKeyCallback (or derived information) and make security relevant determinations based on it once the connection is established, may make incorrect assumptions.\n\nFor example, an attacker may send public keys A and B, and then authenticate with A. PublicKeyCallback would be called only twice, first with A and then with B. A vulnerable application may then make authorization decisions based on key B for which the attacker does not actually control the private key.\n\nSince this API is widely misused, as a partial mitigation golang.org/x/cry...@v0.31.0 enforces the property that, when successfully authenticating via public key, the last key passed to ServerConfig.PublicKeyCallback will be the key used to authenticate the connection. PublicKeyCallback will now be called multiple times with the same key, if necessary. Note that the client may still not control the last key passed to PublicKeyCallback if the connection is then authenticated with a different method, such as PasswordCallback, KeyboardInteractiveCallback, or NoClientAuth.\n\nUsers should be using the Extensions field of the Permissions return value from the various authentication callbacks to record data associated with the authentication attempt instead of referencing external state. Once the connection is established the state corresponding to the successful authentication attempt can be retrieved via the ServerConn.Permissions field. Note that some third-party libraries misuse the Permissions type by sharing it across authentication attempts; users of third-party libraries should refer to the relevant projects for guidance.",
  "id": "GHSA-v778-237x-gjrc",
  "modified": "2024-12-11T22:03:04Z",
  "published": "2024-12-11T22:03:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/golang/crypto/commit/b4f1988a35dee11ec3e05d6bf3e90b695fbd8909"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/golang/crypto"
    },
    {
      "type": "WEB",
      "url": "https://go.dev/cl/635315"
    },
    {
      "type": "WEB",
      "url": "https://go.dev/issue/70779"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/golang-announce/c/-nPEi39gI4Q/m/cGVPJCqdAQAJ"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2024-3321"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "Misuse of ServerConfig.PublicKeyCallback may cause authorization bypass in golang.org/x/crypto"
}

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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