GSD-2021-43557

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
The uri-block plugin in Apache APISIX before 2.10.2 uses $request_uri without verification. The $request_uri is the full original request URI without normalization. This makes it possible to construct a URI to bypass the block list on some occasions. For instance, when the block list contains "^/internal/", a URI like `//internal/` can be used to bypass it. Some other plugins also have the same issue. And it may affect the developer's custom plugin.
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CVE-2021-43557
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{
  "GSD": {
    "alias": "CVE-2021-43557",
    "description": "The uri-block plugin in Apache APISIX before 2.10.2 uses $request_uri without verification. The $request_uri is the full original request URI without normalization. This makes it possible to construct a URI to bypass the block list on some occasions. For instance, when the block list contains \"^/internal/\", a URI like `//internal/` can be used to bypass it. Some other plugins also have the same issue. And it may affect the developer\u0027s custom plugin.",
    "id": "GSD-2021-43557"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-43557"
      ],
      "details": "The uri-block plugin in Apache APISIX before 2.10.2 uses $request_uri without verification. The $request_uri is the full original request URI without normalization. This makes it possible to construct a URI to bypass the block list on some occasions. For instance, when the block list contains \"^/internal/\", a URI like `//internal/` can be used to bypass it. Some other plugins also have the same issue. And it may affect the developer\u0027s custom plugin.",
      "id": "GSD-2021-43557",
      "modified": "2023-12-13T01:23:26.641100Z",
      "schema_version": "1.4.0"
    }
  },
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        "ID": "CVE-2021-43557",
        "STATE": "PUBLIC",
        "TITLE": "Path traversal in request_uri variable"
      },
      "affects": {
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          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Apache APISIX",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003e=",
                          "version_name": "Apache APISIX 1.5",
                          "version_value": "1.5"
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      "problemtype": {
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          {
            "description": [
              {
                "lang": "eng",
                "value": "Use Nginx\u0027s $request_uri variable without verification"
              }
            ]
          }
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      },
      "references": {
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          {
            "name": "https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h",
            "refsource": "MISC",
            "url": "https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h"
          },
          {
            "name": "[oss-security] 20211122 CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable",
            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2021/11/22/1"
          },
          {
            "name": "[oss-security] 20211122 Re: CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable",
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            "url": "http://www.openwall.com/lists/oss-security/2021/11/22/2"
          },
          {
            "name": "[oss-security] 20211123 Re: CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable",
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          }
        ]
      },
      "source": {
        "discovery": "UNKNOWN"
      },
      "work_around": [
        {
          "lang": "eng",
          "value": "1. Upgrade to APISIX 2.10.2, or apply this commit which provides a normalized $request_uri: https://github.com/apache/apisix/commit/9fc38330e82ce46e2aaabceef7d61708c91782db\n2. Carefully review custom code, find \u0026 fix the usage of $request_uri without verification."
        }
      ]
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                "versionEndExcluding": "2.10.2",
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            }
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      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.0,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "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
        }
      },
      "lastModifiedDate": "2021-11-26T15:47Z",
      "publishedDate": "2021-11-22T09:15Z"
    }
  }
}


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