Vulnerability-Lookup

CVE-2024-23656 (GCVE-0-2024-23656)

Vulnerability from cvelistv5 – Published: 2024-01-25 19:45 – Updated: 2025-06-03 18:20

Title

Dex 2.37.0 is discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers

Summary

Dex is an identity service that uses OpenID Connect to drive authentication for other apps. Dex 2.37.0 serves HTTPS with insecure TLS 1.0 and TLS 1.1. `cmd/dex/serve.go` line 425 seemingly sets TLS 1.2 as minimum version, but the whole `tlsConfig` is ignored after `TLS cert reloader` was introduced in v2.37.0. Configured cipher suites are not respected either. This issue is fixed in Dex 2.38.0.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-03 18:20 UTC

CWE

CWE-326 - Inadequate Encryption Strength
CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7637 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/dexidp/dex/security/advisories…	x_refsource_CONFIRM
https://github.com/dexidp/dex/issues/2848	x_refsource_MISC
https://github.com/dexidp/dex/pull/2964	x_refsource_MISC
https://github.com/dexidp/dex/commit/5bbdb4420254…	x_refsource_MISC
https://github.com/dexidp/dex/blob/70d7a2c7c1bb26…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
dexidp	dex	Affected: = 2.37.0	guessed

Show details on NVD website

JSON

To clipboard

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            },
            {
              "name": "https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425"
            }
          ],
          "source": {
            "advisory": "GHSA-gr79-9v6v-gc9r",
            "discovery": "UNKNOWN"
          },
          "title": "Dex 2.37.0 is discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2024-23656",
        "datePublished": "2024-01-25T19:45:41.237Z",
        "dateReserved": "2024-01-19T00:18:53.235Z",
        "dateUpdated": "2025-06-03T18:20:38.271Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}

FKIE_CVE-2024-23656

Vulnerability from fkie_nvd - Published: 2024-01-25 20:15 - Updated: 2026-06-17 07:13

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425	Product
security-advisories@github.com	https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17	Patch
security-advisories@github.com	https://github.com/dexidp/dex/issues/2848	Issue Tracking
security-advisories@github.com	https://github.com/dexidp/dex/pull/2964	Issue Tracking, Patch
security-advisories@github.com	https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r	Exploit
af854a3a-2127-422b-91ae-364da2661108	https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425	Product
af854a3a-2127-422b-91ae-364da2661108	https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17	Patch
af854a3a-2127-422b-91ae-364da2661108	https://github.com/dexidp/dex/issues/2848	Issue Tracking
af854a3a-2127-422b-91ae-364da2661108	https://github.com/dexidp/dex/pull/2964	Issue Tracking, Patch
af854a3a-2127-422b-91ae-364da2661108	https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r	Exploit

Impacted products

	Vendor	Product	Version
	linuxfoundation	dex	2.37.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "dex",
          "vendor": "dexidp",
          "versions": [
            {
              "status": "affected",
              "version": "= 2.37.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:linuxfoundation:dex:2.37.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "CFFADC7B-A8BE-437B-B1A8-868ECD4ED5E9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Dex is an identity service that uses OpenID Connect to drive authentication for other apps. Dex 2.37.0 serves HTTPS with insecure TLS 1.0 and TLS 1.1. `cmd/dex/serve.go` line 425 seemingly sets TLS 1.2 as minimum version, but the whole `tlsConfig` is ignored after `TLS cert reloader` was introduced in v2.37.0. Configured cipher suites are not respected either. This issue is fixed in Dex 2.38.0."
    },
    {
      "lang": "es",
      "value": "Dex es un servicio de identidad que utiliza OpenID Connect para impulsar la autenticaci\u00f3n de otras aplicaciones. Dex 2.37.0 sirve HTTPS con TLS 1.0 y TLS 1.1 inseguros. La l\u00ednea 425 de `cmd/dex/serve.go` aparentemente establece TLS 1.2 como versi\u00f3n m\u00ednima, pero el `tlsConfig` completo se ignora despu\u00e9s de que se introdujo el `TLS cert reloader` en v2.37.0. Tampoco se respetan los conjuntos de cifrado configurados. Este problema se solucion\u00f3 en Dex 2.38.0."
    }
  ],
  "id": "CVE-2024-23656",
  "lastModified": "2026-06-17T07:13:19.220",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-23656",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-06-03T18:20:22.340742Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-01-25T20:15:41.107",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product"
      ],
      "url": "https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/dexidp/dex/issues/2848"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/dexidp/dex/pull/2964"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit"
      ],
      "url": "https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Product"
      ],
      "url": "https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/dexidp/dex/issues/2848"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/dexidp/dex/pull/2964"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit"
      ],
      "url": "https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-326"
        },
        {
          "lang": "en",
          "value": "CWE-757"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-326"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-GR79-9V6V-GC9R

Vulnerability from github – Published: 2024-01-26 01:57 – Updated: 2025-05-27 15:45

Summary

Dex discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers

Details

Summary

Dex 2.37.0 is serving HTTPS with insecure TLS 1.0 and TLS 1.1.

Details

While working on https://github.com/dexidp/dex/issues/2848 and implementing configurable TLS support, I noticed my changes did not have any effect in TLS config, so I started investigating.

https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425 is seemingly setting TLS 1.2 as minimum version, but the whole tlsConfig is ignored after "TLS cert reloader" was introduced in https://github.com/dexidp/dex/pull/2964. Configured cipher suites are not respected either, as seen on the output.

PoC

Build Dex, generate certs with gencert.sh, modify config.dev.yaml to run on https, using generated certs.

issuer: http://127.0.0.1:5556/dex

storage:
  type: sqlite3
  config:
    file: dex.db

web:
  https: 127.0.0.1:5556
  tlsCert: examples/k8s/ssl/cert.pem
  tlsKey: examples/k8s/ssl/key.pem

<rest as default>

Run dex bin/dex serve config.dev.yaml.

Install sslyze, easy to use SSL connection analyzer:

pip3 install sslyze
sslyze 127.0.0.1:5556

In Dex 2.37.0, TLS 1.0 and TLS 1.1 are enabled in addition to expected TLS 1.2 and TLS 1.3.

 * TLS 1.0 Cipher Suites:
     Attempted to connect using 80 cipher suites.

     The server accepted the following 6 cipher suites:
        TLS_RSA_WITH_AES_256_CBC_SHA                      256                      
        TLS_RSA_WITH_AES_128_CBC_SHA                      128                      
        TLS_RSA_WITH_3DES_EDE_CBC_SHA                     168                      
        TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                256       ECDH: prime256v1 (256 bits)
        TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                128       ECDH: prime256v1 (256 bits)
        TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA               168       ECDH: prime256v1 (256 bits)

     The group of cipher suites supported by the server has the following properties:
       Forward Secrecy                    OK - Supported
       Legacy RC4 Algorithm               OK - Not Supported


 * TLS 1.1 Cipher Suites:
     Attempted to connect using 80 cipher suites.

     The server accepted the following 6 cipher suites:
        TLS_RSA_WITH_AES_256_CBC_SHA                      256                      
        TLS_RSA_WITH_AES_128_CBC_SHA                      128                      
        TLS_RSA_WITH_3DES_EDE_CBC_SHA                     168                      
        TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                256       ECDH: prime256v1 (256 bits)
        TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                128       ECDH: prime256v1 (256 bits)
        TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA               168       ECDH: prime256v1 (256 bits)

     The group of cipher suites supported by the server has the following properties:
       Forward Secrecy                    OK - Supported
       Legacy RC4 Algorithm               OK - Not Supported


 * TLS 1.2 Cipher Suites:
     Attempted to connect using 156 cipher suites.

     The server accepted the following 11 cipher suites:
        TLS_RSA_WITH_AES_256_GCM_SHA384                   256                      
        TLS_RSA_WITH_AES_256_CBC_SHA                      256                      
        TLS_RSA_WITH_AES_128_GCM_SHA256                   128                      
        TLS_RSA_WITH_AES_128_CBC_SHA                      128                      
        TLS_RSA_WITH_3DES_EDE_CBC_SHA                     168                      
        TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256       256       ECDH: X25519 (253 bits)
        TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384             256       ECDH: prime256v1 (256 bits)
        TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                256       ECDH: prime256v1 (256 bits)
        TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256             128       ECDH: prime256v1 (256 bits)
        TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                128       ECDH: prime256v1 (256 bits)
        TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA               168       ECDH: prime256v1 (256 bits)

     The group of cipher suites supported by the server has the following properties:
       Forward Secrecy                    OK - Supported
       Legacy RC4 Algorithm               OK - Not Supported


 * TLS 1.3 Cipher Suites:
     Attempted to connect using 5 cipher suites.

     The server accepted the following 3 cipher suites:
        TLS_CHACHA20_POLY1305_SHA256                      256       ECDH: X25519 (253 bits)
        TLS_AES_256_GCM_SHA384                            256       ECDH: X25519 (253 bits)
        TLS_AES_128_GCM_SHA256                            128       ECDH: X25519 (253 bits)

In Dex 2.36.0, TLS 1.0 and TLS 1.1 are disabled as expected.

 * TLS 1.0 Cipher Suites:
     Attempted to connect using 80 cipher suites; the server rejected all cipher suites.

 * TLS 1.1 Cipher Suites:
     Attempted to connect using 80 cipher suites; the server rejected all cipher suites.

 * TLS 1.2 Cipher Suites:
     Attempted to connect using 156 cipher suites.

     The server accepted the following 5 cipher suites:
        TLS_RSA_WITH_AES_256_GCM_SHA384                   256                      
        TLS_RSA_WITH_AES_128_GCM_SHA256                   128                      
        TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256       256       ECDH: X25519 (253 bits)
        TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384             256       ECDH: prime256v1 (256 bits)
        TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256             128       ECDH: prime256v1 (256 bits)

     The group of cipher suites supported by the server has the following properties:
       Forward Secrecy                    OK - Supported
       Legacy RC4 Algorithm               OK - Not Supported


 * TLS 1.3 Cipher Suites:
     Attempted to connect using 5 cipher suites.

     The server accepted the following 3 cipher suites:
        TLS_CHACHA20_POLY1305_SHA256                      256       ECDH: X25519 (253 bits)
        TLS_AES_256_GCM_SHA384                            256       ECDH: X25519 (253 bits)

Impact

TLS 1.0 and TLS 1.1 connections can be decrypted by the attacker, and hence decrypt the traffic to Dex.

Severity

7.5 (High)


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

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/dexidp/dex"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.37.0"
            },
            {
              "fixed": "2.38.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.37.0"
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/dexidp/dex"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20240125115555-5bbdb4420254"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-23656"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-326"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-01-26T01:57:31Z",
    "nvd_published_at": "2024-01-25T20:15:41Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nDex 2.37.0 is serving HTTPS with insecure TLS 1.0 and TLS 1.1.\n\n\n### Details\nWhile working on https://github.com/dexidp/dex/issues/2848 and implementing configurable TLS support, I noticed my changes did not have any effect in TLS config, so I started investigating. \n\nhttps://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425 is seemingly setting TLS 1.2 as minimum version, but the whole tlsConfig is ignored after \"TLS cert reloader\" was introduced in https://github.com/dexidp/dex/pull/2964. Configured cipher suites are not respected either, as seen on the output.\n\n### PoC\nBuild Dex, generate certs with `gencert.sh`, modify `config.dev.yaml` to run on https, using generated certs.\n\n```console\nissuer: http://127.0.0.1:5556/dex\n\nstorage:\n  type: sqlite3\n  config:\n    file: dex.db\n\nweb:\n  https: 127.0.0.1:5556\n  tlsCert: examples/k8s/ssl/cert.pem\n  tlsKey: examples/k8s/ssl/key.pem\n\n\u003crest as default\u003e\n```\n\nRun dex `bin/dex serve config.dev.yaml`.\n\nInstall `sslyze`, easy to use SSL connection analyzer:\n\n```console\npip3 install sslyze\nsslyze 127.0.0.1:5556\n```\n\nIn Dex 2.37.0, TLS 1.0 and TLS 1.1 are enabled in addition to expected TLS 1.2 and TLS 1.3.\n```console\n * TLS 1.0 Cipher Suites:\n     Attempted to connect using 80 cipher suites.\n\n     The server accepted the following 6 cipher suites:\n        TLS_RSA_WITH_AES_256_CBC_SHA                      256                      \n        TLS_RSA_WITH_AES_128_CBC_SHA                      128                      \n        TLS_RSA_WITH_3DES_EDE_CBC_SHA                     168                      \n        TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                256       ECDH: prime256v1 (256 bits)\n        TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                128       ECDH: prime256v1 (256 bits)\n        TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA               168       ECDH: prime256v1 (256 bits)\n\n     The group of cipher suites supported by the server has the following properties:\n       Forward Secrecy                    OK - Supported\n       Legacy RC4 Algorithm               OK - Not Supported\n\n\n * TLS 1.1 Cipher Suites:\n     Attempted to connect using 80 cipher suites.\n\n     The server accepted the following 6 cipher suites:\n        TLS_RSA_WITH_AES_256_CBC_SHA                      256                      \n        TLS_RSA_WITH_AES_128_CBC_SHA                      128                      \n        TLS_RSA_WITH_3DES_EDE_CBC_SHA                     168                      \n        TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                256       ECDH: prime256v1 (256 bits)\n        TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                128       ECDH: prime256v1 (256 bits)\n        TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA               168       ECDH: prime256v1 (256 bits)\n\n     The group of cipher suites supported by the server has the following properties:\n       Forward Secrecy                    OK - Supported\n       Legacy RC4 Algorithm               OK - Not Supported\n\n\n * TLS 1.2 Cipher Suites:\n     Attempted to connect using 156 cipher suites.\n\n     The server accepted the following 11 cipher suites:\n        TLS_RSA_WITH_AES_256_GCM_SHA384                   256                      \n        TLS_RSA_WITH_AES_256_CBC_SHA                      256                      \n        TLS_RSA_WITH_AES_128_GCM_SHA256                   128                      \n        TLS_RSA_WITH_AES_128_CBC_SHA                      128                      \n        TLS_RSA_WITH_3DES_EDE_CBC_SHA                     168                      \n        TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256       256       ECDH: X25519 (253 bits)\n        TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384             256       ECDH: prime256v1 (256 bits)\n        TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                256       ECDH: prime256v1 (256 bits)\n        TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256             128       ECDH: prime256v1 (256 bits)\n        TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                128       ECDH: prime256v1 (256 bits)\n        TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA               168       ECDH: prime256v1 (256 bits)\n\n     The group of cipher suites supported by the server has the following properties:\n       Forward Secrecy                    OK - Supported\n       Legacy RC4 Algorithm               OK - Not Supported\n\n\n * TLS 1.3 Cipher Suites:\n     Attempted to connect using 5 cipher suites.\n\n     The server accepted the following 3 cipher suites:\n        TLS_CHACHA20_POLY1305_SHA256                      256       ECDH: X25519 (253 bits)\n        TLS_AES_256_GCM_SHA384                            256       ECDH: X25519 (253 bits)\n        TLS_AES_128_GCM_SHA256                            128       ECDH: X25519 (253 bits)\n```\n\nIn Dex 2.36.0, TLS 1.0 and TLS 1.1 are disabled as expected.\n```console\n * TLS 1.0 Cipher Suites:\n     Attempted to connect using 80 cipher suites; the server rejected all cipher suites.\n\n * TLS 1.1 Cipher Suites:\n     Attempted to connect using 80 cipher suites; the server rejected all cipher suites.\n\n * TLS 1.2 Cipher Suites:\n     Attempted to connect using 156 cipher suites.\n\n     The server accepted the following 5 cipher suites:\n        TLS_RSA_WITH_AES_256_GCM_SHA384                   256                      \n        TLS_RSA_WITH_AES_128_GCM_SHA256                   128                      \n        TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256       256       ECDH: X25519 (253 bits)\n        TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384             256       ECDH: prime256v1 (256 bits)\n        TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256             128       ECDH: prime256v1 (256 bits)\n\n     The group of cipher suites supported by the server has the following properties:\n       Forward Secrecy                    OK - Supported\n       Legacy RC4 Algorithm               OK - Not Supported\n\n\n * TLS 1.3 Cipher Suites:\n     Attempted to connect using 5 cipher suites.\n\n     The server accepted the following 3 cipher suites:\n        TLS_CHACHA20_POLY1305_SHA256                      256       ECDH: X25519 (253 bits)\n        TLS_AES_256_GCM_SHA384                            256       ECDH: X25519 (253 bits)\n```\n\n### Impact\nTLS 1.0 and TLS 1.1 connections can be decrypted by the attacker, and hence decrypt the traffic to Dex.",
  "id": "GHSA-gr79-9v6v-gc9r",
  "modified": "2025-05-27T15:45:13Z",
  "published": "2024-01-26T01:57:31Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-23656"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dexidp/dex/issues/2848"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dexidp/dex/pull/2964"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dexidp/dex"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Dex discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers"
}

GSD-2024-23656

Vulnerability from gsd - Updated: 2024-01-19 06:02

Details

Aliases

CVE-2024-23656

JSON

To clipboard

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2024-23656"
      ],
      "details": "Dex is an identity service that uses OpenID Connect to drive authentication for other apps. Dex 2.37.0 serves HTTPS with insecure TLS 1.0 and TLS 1.1. `cmd/dex/serve.go` line 425 seemingly sets TLS 1.2 as minimum version, but the whole `tlsConfig` is ignored after `TLS cert reloader` was introduced in v2.37.0. Configured cipher suites are not respected either. This issue is fixed in Dex 2.38.0.",
      "id": "GSD-2024-23656",
      "modified": "2024-01-19T06:02:13.327418Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2024-23656",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "dex",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "= 2.37.0"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "dexidp"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "Dex is an identity service that uses OpenID Connect to drive authentication for other apps. Dex 2.37.0 serves HTTPS with insecure TLS 1.0 and TLS 1.1. `cmd/dex/serve.go` line 425 seemingly sets TLS 1.2 as minimum version, but the whole `tlsConfig` is ignored after `TLS cert reloader` was introduced in v2.37.0. Configured cipher suites are not respected either. This issue is fixed in Dex 2.38.0."
          }
        ]
      },
      "impact": {
        "cvss": [
          {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "cweId": "CWE-326",
                "lang": "eng",
                "value": "CWE-326: Inadequate Encryption Strength"
              }
            ]
          },
          {
            "description": [
              {
                "cweId": "CWE-757",
                "lang": "eng",
                "value": "CWE-757: Selection of Less-Secure Algorithm During Negotiation (\u0027Algorithm Downgrade\u0027)"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r",
            "refsource": "MISC",
            "url": "https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r"
          },
          {
            "name": "https://github.com/dexidp/dex/issues/2848",
            "refsource": "MISC",
            "url": "https://github.com/dexidp/dex/issues/2848"
          },
          {
            "name": "https://github.com/dexidp/dex/pull/2964",
            "refsource": "MISC",
            "url": "https://github.com/dexidp/dex/pull/2964"
          },
          {
            "name": "https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17",
            "refsource": "MISC",
            "url": "https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17"
          },
          {
            "name": "https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425",
            "refsource": "MISC",
            "url": "https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-gr79-9v6v-gc9r",
        "discovery": "UNKNOWN"
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:linuxfoundation:dex:2.37.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "CFFADC7B-A8BE-437B-B1A8-868ECD4ED5E9",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "descriptions": [
          {
            "lang": "en",
            "value": "Dex is an identity service that uses OpenID Connect to drive authentication for other apps. Dex 2.37.0 serves HTTPS with insecure TLS 1.0 and TLS 1.1. `cmd/dex/serve.go` line 425 seemingly sets TLS 1.2 as minimum version, but the whole `tlsConfig` is ignored after `TLS cert reloader` was introduced in v2.37.0. Configured cipher suites are not respected either. This issue is fixed in Dex 2.38.0."
          },
          {
            "lang": "es",
            "value": "Dex es un servicio de identidad que utiliza OpenID Connect para impulsar la autenticaci\u00f3n de otras aplicaciones. Dex 2.37.0 sirve HTTPS con TLS 1.0 y TLS 1.1 inseguros. La l\u00ednea 425 de `cmd/dex/serve.go` aparentemente establece TLS 1.2 como versi\u00f3n m\u00ednima, pero el `tlsConfig` completo se ignora despu\u00e9s de que se introdujo el `TLS cert reloader` en v2.37.0. Tampoco se respetan los conjuntos de cifrado configurados. Este problema se solucion\u00f3 en Dex 2.38.0."
          }
        ],
        "id": "CVE-2024-23656",
        "lastModified": "2024-01-31T23:26:14.650",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2024-01-25T20:15:41.107",
        "references": [
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Product"
            ],
            "url": "https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Patch"
            ],
            "url": "https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Issue Tracking"
            ],
            "url": "https://github.com/dexidp/dex/issues/2848"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Issue Tracking",
              "Patch"
            ],
            "url": "https://github.com/dexidp/dex/pull/2964"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Exploit"
            ],
            "url": "https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-326"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-326"
              },
              {
                "lang": "en",
                "value": "CWE-757"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}

Sightings

Author	Source	Type	Date	Other

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CVE-2024-23656 (GCVE-0-2024-23656)

FKIE_CVE-2024-23656

GHSA-GR79-9V6V-GC9R

Summary

Details

PoC

Impact

GSD-2024-23656

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour