github - ghsa-2xpx-vcmq-5f72

GHSA-2XPX-VCMQ-5F72

Vulnerability from github – Published: 2024-06-28 21:05 – Updated: 2024-07-02 02:26

Summary

Unlimited number of NTS-KE connections can crash ntpd-rs server

Details

Summary

Missing limit for accepted NTS-KE connections allows an unauthenticated remote attacker to crash ntpd-rs when an NTS-KE server is configured. Non NTS-KE server configurations, such as the default ntpd-rs configuration, are unaffected.

Details

Operating systems have a limit for the number of open file descriptors (which includes sockets) in a single process, e.g. 1024 on Linux by default. When ntpd-rs is configured as an NTS server, it accepts TCP connections for the NTS-KE service. If the process has reached the descriptor limit and tries to accept a new TCP connection, the accept() system call will return with the EMFILE error and cause ntpd-rs to abort.

A remote attacker can open a large number of parallel TCP connections to the server to trigger this crash. The connections need to be opened quickly enough to avoid the key-exchange-timeout-ms timeout (by default 1000 milliseconds).

Impact

Only NTS-KE server configuration are affected. Those without an NTS-KE server configuration such as NTS client only or NTP only configuration are unaffected. For affected configurations the ntpd-rs daemon can made completely unavailable by crashing the service. If ntpd-rs is automatically restarted, an attacker can repeat the attack to prevent ntpd-rs from doing anything useful.

Workarounds

Disable NTS-KE server functionality
Increase system resource limits (RLIMIT_NOFILE) to make the attack more difficult
Lower the key-exchange-timeout-ms configuration setting to make the attack more difficult

Severity ?

7.5 (High)


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

8.7 (High)


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

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JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.1.2"
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "ntpd"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.3.1"
            },
            {
              "fixed": "1.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-38528"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-06-28T21:05:52Z",
    "nvd_published_at": "2024-06-28T20:15:02Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nMissing limit for accepted NTS-KE connections allows an unauthenticated remote attacker to crash ntpd-rs when an NTS-KE server is configured. Non NTS-KE server configurations, such as the default ntpd-rs configuration, are unaffected.\n\n### Details\nOperating systems have a limit for the number of open file descriptors (which includes sockets) in a single process, e.g. 1024 on Linux by default. When ntpd-rs is configured as an NTS server, it accepts TCP connections for the NTS-KE service. If the process has reached the descriptor limit and tries to accept a new TCP connection, the accept() system call will return with the EMFILE error and cause ntpd-rs to abort.\n\nA remote attacker can open a large number of parallel TCP connections to the server to trigger this crash. The connections need to be opened quickly enough to avoid the `key-exchange-timeout-ms` timeout (by default 1000 milliseconds).\n\n### Impact\nOnly NTS-KE server configuration are affected. Those without an NTS-KE server configuration such as NTS client only or NTP only configuration are unaffected. For affected configurations the ntpd-rs daemon can made completely unavailable by crashing the service. If ntpd-rs is automatically restarted, an attacker can repeat the attack to prevent ntpd-rs from doing anything useful.\n\n### Workarounds\n- Disable NTS-KE server functionality\n- Increase system resource limits (`RLIMIT_NOFILE`) to make the attack more difficult\n- Lower the `key-exchange-timeout-ms` configuration setting to make the attack more difficult",
  "id": "GHSA-2xpx-vcmq-5f72",
  "modified": "2024-07-02T02:26:15Z",
  "published": "2024-06-28T21:05:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pendulum-project/ntpd-rs/security/advisories/GHSA-2xpx-vcmq-5f72"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-38528"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pendulum-project/ntpd-rs/commit/6049687006ea5b26eeac927964b5fcc80d7bde50"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pendulum-project/ntpd-rs"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Unlimited number of NTS-KE connections can crash ntpd-rs server"
}

CVE-2024-38528 (GCVE-0-2024-38528)

Vulnerability from cvelistv5 – Published: 2024-06-28 19:28 – Updated: 2024-08-02 04:12

Title

Unlimited number of NTS-KE connections can crash ntpd-rs server

Summary

nptd-rs is a tool for synchronizing your computer's clock, implementing the NTP and NTS protocols. There is a missing limit for accepted NTS-KE connections. This allows an unauthenticated remote attacker to crash ntpd-rs when an NTS-KE server is configured. Non NTS-KE server configurations, such as the default ntpd-rs configuration, are unaffected. This vulnerability has been patched in version 1.1.3.

Severity ?

7.5 (High)


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

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

URL

Tags

https://github.com/pendulum-project/ntpd-rs/secur…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	pendulum-project	ntpd-rs	Affected: >= 0.3.1, <= 1.1.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:tweedegolf:ntpd-rs:0.3.1:*:*:*:*:rust:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "ntpd-rs",
            "vendor": "tweedegolf",
            "versions": [
              {
                "lessThanOrEqual": "1.1.2",
                "status": "affected",
                "version": "0.3.1",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-38528",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-07-01T17:42:24.718924Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-07-01T17:42:28.026Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T04:12:25.343Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/pendulum-project/ntpd-rs/security/advisories/GHSA-2xpx-vcmq-5f72",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/pendulum-project/ntpd-rs/security/advisories/GHSA-2xpx-vcmq-5f72"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ntpd-rs",
          "vendor": "pendulum-project",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.3.1, \u003c= 1.1.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "nptd-rs is a tool for synchronizing your computer\u0027s clock, implementing the NTP and NTS protocols. There is a missing limit for accepted NTS-KE connections. This allows an unauthenticated remote attacker to crash ntpd-rs when an NTS-KE server is configured. Non NTS-KE server configurations, such as the default ntpd-rs configuration, are unaffected. This vulnerability has been patched in version 1.1.3.\n"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-06-28T19:28:34.664Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pendulum-project/ntpd-rs/security/advisories/GHSA-2xpx-vcmq-5f72",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pendulum-project/ntpd-rs/security/advisories/GHSA-2xpx-vcmq-5f72"
        }
      ],
      "source": {
        "advisory": "GHSA-2xpx-vcmq-5f72",
        "discovery": "UNKNOWN"
      },
      "title": "Unlimited number of NTS-KE connections can crash ntpd-rs server"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-38528",
    "datePublished": "2024-06-28T19:28:34.664Z",
    "dateReserved": "2024-06-18T16:37:02.728Z",
    "dateUpdated": "2024-08-02T04:12:25.343Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

Action not permitted

GHSA-2XPX-VCMQ-5F72

Summary

Details

Impact

Workarounds

CVE-2024-38528 (GCVE-0-2024-38528)

Tags

Sightings

Nomenclature