cnvd - cnvd-2021-29846

cnvd-2021-29846

Vulnerability from cnvd

Title: Knot Resolver资源管理错误漏洞

Description:

Knot Resolver是捷克共和国CZ.NIC协会的一款使用C语言和LuaJIT编写的开源缓存DNS解析器。

Knot Resolver 5.1.1之前版本中存在资源管理错误漏洞。攻击者可借助特制DNS响应利用该漏洞造成拒绝服务。

Severity: 中

Patch Name: Knot Resolver资源管理错误漏洞的补丁

Patch Description:

Knot Resolver是捷克共和国CZ.NIC协会的一款使用C语言和LuaJIT编写的开源缓存DNS解析器。

Knot Resolver 5.1.1之前版本中存在资源管理错误漏洞。攻击者可借助特制DNS响应利用该漏洞造成拒绝服务。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description:

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html

Reference: https://nvd.nist.gov/vuln/detail/CVE-2020-12667

Impacted products

Name
CZ.NIC Knot Resolver <5.1.1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-12667"
    }
  },
  "description": "Knot Resolver\u662f\u6377\u514b\u5171\u548c\u56fdCZ.NIC\u534f\u4f1a\u7684\u4e00\u6b3e\u4f7f\u7528C\u8bed\u8a00\u548cLuaJIT\u7f16\u5199\u7684\u5f00\u6e90\u7f13\u5b58DNS\u89e3\u6790\u5668\u3002\n\nKnot Resolver 5.1.1\u4e4b\u524d\u7248\u672c\u4e2d\u5b58\u5728\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u501f\u52a9\u7279\u5236DNS\u54cd\u5e94\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210\u62d2\u7edd\u670d\u52a1\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a\r\nhttps://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-29846",
  "openTime": "2021-04-21",
  "patchDescription": "Knot Resolver\u662f\u6377\u514b\u5171\u548c\u56fdCZ.NIC\u534f\u4f1a\u7684\u4e00\u6b3e\u4f7f\u7528C\u8bed\u8a00\u548cLuaJIT\u7f16\u5199\u7684\u5f00\u6e90\u7f13\u5b58DNS\u89e3\u6790\u5668\u3002\r\n\r\nKnot Resolver 5.1.1\u4e4b\u524d\u7248\u672c\u4e2d\u5b58\u5728\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u501f\u52a9\u7279\u5236DNS\u54cd\u5e94\u5229\u7528\u8be5\u6f0f\u6d1e\u9020\u6210\u62d2\u7edd\u670d\u52a1\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Knot Resolver\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "CZ.NIC Knot Resolver \u003c5.1.1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-12667",
  "serverity": "\u4e2d",
  "submitTime": "2020-05-20",
  "title": "Knot Resolver\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e"
}

CVE-2020-12667 (GCVE-0-2020-12667)

Vulnerability from cvelistv5

Published

2020-05-19 00:00

Modified

2024-08-04 12:04

Severity ?

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

CWE

Summary

Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.

References

▼	URL	Tags
	https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/
	https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html
	http://www.openwall.com/lists/oss-security/2020/05/19/2	mailing-list
	http://cyber-security-group.cs.tau.ac.il/#
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/	vendor-advisory
	https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html	mailing-list

Impacted products

	Vendor	Product	Version
	n/a	n/a	Version: n/a

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:nic:knot_resolver:-:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "knot_resolver",
            "vendor": "nic",
            "versions": [
              {
                "status": "affected",
                "version": "-"
              }
            ]
          }
        ],
        "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2020-12667",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-04-26T17:02:23.525566Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-400",
                "description": "CWE-400 Uncontrolled Resource Consumption",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:12:29.314Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T12:04:22.538Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html"
          },
          {
            "name": "[oss-security] 20200519 [CVE-2020-12667] Knot Resolver 5.1.1 NXNSAttack mitigation",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2020/05/19/2"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "http://cyber-security-group.cs.tau.ac.il/#"
          },
          {
            "name": "FEDORA-2020-bf68101ad3",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/"
          },
          {
            "name": "[debian-lts-announce] 20240426 [SECURITY] [DLA 3795-1] knot-resolver security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "datePublic": "2020-05-19T00:00:00",
      "descriptions": [
        {
          "lang": "en",
          "value": "Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an \"NXNSAttack\" issue. This is triggered by random subdomains in the NSDNAME in NS records."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-04-26T07:06:02.945535",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/"
        },
        {
          "url": "https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html"
        },
        {
          "name": "[oss-security] 20200519 [CVE-2020-12667] Knot Resolver 5.1.1 NXNSAttack mitigation",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2020/05/19/2"
        },
        {
          "url": "http://cyber-security-group.cs.tau.ac.il/#"
        },
        {
          "name": "FEDORA-2020-bf68101ad3",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/"
        },
        {
          "name": "[debian-lts-announce] 20240426 [SECURITY] [DLA 3795-1] knot-resolver security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2020-12667",
    "datePublished": "2020-05-19T00:00:00",
    "dateReserved": "2020-05-05T00:00:00",
    "dateUpdated": "2024-08-04T12:04:22.538Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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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