Vulnerability-Lookup

CNVD-2021-92464

Vulnerability from cnvd - Published: 2021-11-30

Title

backstage跨站脚本漏洞

Description

backstage是一个应用软件。后台是一个开放的平台,用于构建开发者门户 Backstage存在跨站脚本漏洞，该漏洞源于在受影响的版本中，auth-backend插件缺少针对URL参数的过滤与转义。攻击者可利用该漏洞从用户的浏览器中窃取访问令牌或其他秘密。

Severity

高

Patch Name

backstage跨站脚本漏洞的补丁

Patch Description

backstage是一个应用软件。后台是一个开放的平台,用于构建开发者门户 Backstage存在跨站脚本漏洞，该漏洞源于在受影响的版本中，auth-backend插件缺少针对URL参数的过滤与转义。攻击者可利用该漏洞从用户的浏览器中窃取访问令牌或其他秘密。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://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-43776

Impacted products

Name
Backstage Backstage

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-43776"
    }
  },
  "description": "backstage\u662f\u4e00\u4e2a\u5e94\u7528\u8f6f\u4ef6\u3002\u540e\u53f0\u662f\u4e00\u4e2a\u5f00\u653e\u7684\u5e73\u53f0,\u7528\u4e8e\u6784\u5efa\u5f00\u53d1\u8005\u95e8\u6237\n\nBackstage\u5b58\u5728\u8de8\u7ad9\u811a\u672c\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728\u53d7\u5f71\u54cd\u7684\u7248\u672c\u4e2d\uff0cauth-backend\u63d2\u4ef6\u7f3a\u5c11\u9488\u5bf9URL\u53c2\u6570\u7684\u8fc7\u6ee4\u4e0e\u8f6c\u4e49\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u4ece\u7528\u6237\u7684\u6d4f\u89c8\u5668\u4e2d\u7a83\u53d6\u8bbf\u95ee\u4ee4\u724c\u6216\u5176\u4ed6\u79d8\u5bc6\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://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-92464",
  "openTime": "2021-11-30",
  "patchDescription": "backstage\u662f\u4e00\u4e2a\u5e94\u7528\u8f6f\u4ef6\u3002\u540e\u53f0\u662f\u4e00\u4e2a\u5f00\u653e\u7684\u5e73\u53f0,\u7528\u4e8e\u6784\u5efa\u5f00\u53d1\u8005\u95e8\u6237\r\n\r\nBackstage\u5b58\u5728\u8de8\u7ad9\u811a\u672c\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5728\u53d7\u5f71\u54cd\u7684\u7248\u672c\u4e2d\uff0cauth-backend\u63d2\u4ef6\u7f3a\u5c11\u9488\u5bf9URL\u53c2\u6570\u7684\u8fc7\u6ee4\u4e0e\u8f6c\u4e49\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u4ece\u7528\u6237\u7684\u6d4f\u89c8\u5668\u4e2d\u7a83\u53d6\u8bbf\u95ee\u4ee4\u724c\u6216\u5176\u4ed6\u79d8\u5bc6\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": "backstage\u8de8\u7ad9\u811a\u672c\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "Backstage Backstage"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-43776",
  "serverity": "\u9ad8",
  "submitTime": "2021-11-30",
  "title": "backstage\u8de8\u7ad9\u811a\u672c\u6f0f\u6d1e"
}

CVE-2021-43776 (GCVE-0-2021-43776)

Vulnerability from cvelistv5 – Published: 2021-11-26 18:15 – Updated: 2024-08-04 04:03

Title

XSS vulnerability in @backstage/plugin-auth-backend

Summary

Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user's browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`.

Severity

7.4 (High)


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

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/backstage/backstage/security/a…	x_refsource_CONFIRM
https://github.com/backstage/backstage/tree/maste…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
backstage	backstage	Affected: < 0.4.9

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T04:03:08.688Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/backstage/backstage/tree/master/plugins/auth-backend"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "backstage",
          "vendor": "backstage",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.4.9"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user\u0027s browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-11-26T18:15:10.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/backstage/backstage/tree/master/plugins/auth-backend"
        }
      ],
      "source": {
        "advisory": "GHSA-w7fj-336r-vw49",
        "discovery": "UNKNOWN"
      },
      "title": "XSS vulnerability in @backstage/plugin-auth-backend",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-43776",
          "STATE": "PUBLIC",
          "TITLE": "XSS vulnerability in @backstage/plugin-auth-backend"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "backstage",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 0.4.9"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "backstage"
              }
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        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
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              "value": "Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user\u0027s browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`."
            }
          ]
        },
        "impact": {
          "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
            "version": "3.1"
          }
        },
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              "description": [
                {
                  "lang": "eng",
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                }
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          ]
        },
        "references": {
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              "name": "https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49",
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            },
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              "name": "https://github.com/backstage/backstage/tree/master/plugins/auth-backend",
              "refsource": "MISC",
              "url": "https://github.com/backstage/backstage/tree/master/plugins/auth-backend"
            }
          ]
        },
        "source": {
          "advisory": "GHSA-w7fj-336r-vw49",
          "discovery": "UNKNOWN"
        }
      }
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  },
  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
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    "datePublished": "2021-11-26T18:15:10.000Z",
    "dateReserved": "2021-11-16T00:00:00.000Z",
    "dateUpdated": "2024-08-04T04:03:08.688Z",
    "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.

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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.

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CNVD-2021-92464

CVE-2021-43776 (GCVE-0-2021-43776)

Tags

Sightings

Nomenclature

Related by attack behaviour