Vulnerability-Lookup

CNVD-2021-95640

Vulnerability from cnvd - Published: 2021-12-09

Title

Barrier授权问题漏洞

Description

Barrier是一种模仿Kvm切换器功能的软件。 Barrier存在授权问题漏洞，攻击者可利用该漏洞只需提供一个标识有效客户端配置的客户端标签，就可以使用Barrier组件进入活动会话状态。

Severity

中

Patch Name

Barrier授权问题漏洞的补丁

Patch Description

Barrier是一种模仿Kvm切换器功能的软件。 Barrier存在授权问题漏洞，攻击者可利用该漏洞只需提供一个标识有效客户端配置的客户端标签，就可以使用Barrier组件进入活动会话状态。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

厂商已发布了漏洞修复程序，请及时关注更新： https://www.openwall.com/lists/oss-security/2021/11/02/4

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-42073

Impacted products

Name
Barrier Barrier <2.4.0

Show details on source website

JSON

To clipboard

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  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-42073",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-42073"
    }
  },
  "description": "Barrier\u662f\u4e00\u79cd\u6a21\u4effKvm\u5207\u6362\u5668\u529f\u80fd\u7684\u8f6f\u4ef6\u3002\n\nBarrier\u5b58\u5728\u6388\u6743\u95ee\u9898\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u53ea\u9700\u63d0\u4f9b\u4e00\u4e2a\u6807\u8bc6\u6709\u6548\u5ba2\u6237\u7aef\u914d\u7f6e\u7684\u5ba2\u6237\u7aef\u6807\u7b7e\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528Barrier\u7ec4\u4ef6\u8fdb\u5165\u6d3b\u52a8\u4f1a\u8bdd\u72b6\u6001\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://www.openwall.com/lists/oss-security/2021/11/02/4",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-95640",
  "openTime": "2021-12-09",
  "patchDescription": "Barrier\u662f\u4e00\u79cd\u6a21\u4effKvm\u5207\u6362\u5668\u529f\u80fd\u7684\u8f6f\u4ef6\u3002\r\n\r\nBarrier\u5b58\u5728\u6388\u6743\u95ee\u9898\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u53ea\u9700\u63d0\u4f9b\u4e00\u4e2a\u6807\u8bc6\u6709\u6548\u5ba2\u6237\u7aef\u914d\u7f6e\u7684\u5ba2\u6237\u7aef\u6807\u7b7e\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528Barrier\u7ec4\u4ef6\u8fdb\u5165\u6d3b\u52a8\u4f1a\u8bdd\u72b6\u6001\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": "Barrier\u6388\u6743\u95ee\u9898\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Barrier Barrier \u003c2.4.0"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-42073",
  "serverity": "\u4e2d",
  "submitTime": "2021-11-08",
  "title": "Barrier\u6388\u6743\u95ee\u9898\u6f0f\u6d1e"
}

CVE-2021-42073 (GCVE-0-2021-42073)

Vulnerability from cvelistv5 – Published: 2021-11-08 00:00 – Updated: 2024-08-04 03:22

Summary

An issue was discovered in Barrier before 2.4.0. An attacker can enter an active session state with the barriers component (aka the server-side implementation of Barrier) simply by supplying a client label that identifies a valid client configuration. This label is "Unnamed" by default but could instead be guessed from hostnames or other publicly available information. In the active session state, an attacker can capture input device events from the server, and also modify the clipboard content on the server.

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

4 references

URL	Tags
http://www.openwall.com/lists/oss-security/2021/11/02/4	mailing-list
https://github.com/debauchee/barrier/releases/tag…
https://github.com/debauchee/barrier/commit/b5adc…
https://github.com/debauchee/barrier/commit/229ab…

Show details on NVD website

JSON

To clipboard

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    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T03:22:26.062Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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        "references": [
          {
            "name": "[oss-security] 20211102 Barrier \"software KVM switch\" multiple remote security issues",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2021/11/02/4"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/debauchee/barrier/releases/tag/v2.4.0"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3e"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedcc"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue was discovered in Barrier before 2.4.0. An attacker can enter an active session state with the barriers component (aka the server-side implementation of Barrier) simply by supplying a client label that identifies a valid client configuration. This label is \"Unnamed\" by default but could instead be guessed from hostnames or other publicly available information. In the active session state, an attacker can capture input device events from the server, and also modify the clipboard content on the server."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-11-13T21:54:34.614Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "name": "[oss-security] 20211102 Barrier \"software KVM switch\" multiple remote security issues",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/11/02/4"
        },
        {
          "url": "https://github.com/debauchee/barrier/releases/tag/v2.4.0"
        },
        {
          "url": "https://github.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3e"
        },
        {
          "url": "https://github.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedcc"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-42073",
    "datePublished": "2021-11-08T00:00:00.000Z",
    "dateReserved": "2021-10-07T00:00:00.000Z",
    "dateUpdated": "2024-08-04T03:22:26.062Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.