gsd-2021-43557
Vulnerability from gsd
Modified
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.
Aliases
Aliases
CVE-2021-43557


To clipboard 

{
   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's 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's custom plugin.",
         id: "GSD-2021-43557",
         modified: "2023-12-13T01:23:26.641100Z",
         schema_version: "1.4.0",
      },
   },
   namespaces: {
      "cve.org": {
         CVE_data_meta: {
            ASSIGNER: "security@apache.org",
            ID: "CVE-2021-43557",
            STATE: "PUBLIC",
            TITLE: "Path traversal in request_uri variable",
         },
         affects: {
            vendor: {
               vendor_data: [
                  {
                     product: {
                        product_data: [
                           {
                              product_name: "Apache APISIX",
                              version: {
                                 version_data: [
                                    {
                                       version_affected: ">=",
                                       version_name: "Apache APISIX 1.5",
                                       version_value: "1.5",
                                    },
                                 ],
                              },
                           },
                        ],
                     },
                     vendor_name: "Apache Software Foundation",
                  },
               ],
            },
         },
         data_format: "MITRE",
         data_type: "CVE",
         data_version: "4.0",
         description: {
            description_data: [
               {
                  lang: "eng",
                  value: "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.",
               },
            ],
         },
         generator: {
            engine: "Vulnogram 0.0.9",
         },
         impact: [
            {
               other: "moderate",
            },
         ],
         problemtype: {
            problemtype_data: [
               {
                  description: [
                     {
                        lang: "eng",
                        value: "Use Nginx's $request_uri variable without verification",
                     },
                  ],
               },
            ],
         },
         references: {
            reference_data: [
               {
                  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",
                  refsource: "MLIST",
                  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",
                  refsource: "MLIST",
                  url: "http://www.openwall.com/lists/oss-security/2021/11/23/1",
               },
            ],
         },
         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 & fix the usage of $request_uri without verification.",
            },
         ],
      },
      "nvd.nist.gov": {
         configurations: {
            CVE_data_version: "4.0",
            nodes: [
               {
                  children: [],
                  cpe_match: [
                     {
                        cpe23Uri: "cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*",
                        cpe_name: [],
                        versionEndExcluding: "2.10.2",
                        vulnerable: true,
                     },
                  ],
                  operator: "OR",
               },
            ],
         },
         cve: {
            CVE_data_meta: {
               ASSIGNER: "security@apache.org",
               ID: "CVE-2021-43557",
            },
            data_format: "MITRE",
            data_type: "CVE",
            data_version: "4.0",
            description: {
               description_data: [
                  {
                     lang: "en",
                     value: "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.",
                  },
               ],
            },
            problemtype: {
               problemtype_data: [
                  {
                     description: [
                        {
                           lang: "en",
                           value: "CWE-77",
                        },
                     ],
                  },
               ],
            },
            references: {
               reference_data: [
                  {
                     name: "https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h",
                     refsource: "MISC",
                     tags: [
                        "Exploit",
                        "Mailing List",
                        "Vendor Advisory",
                     ],
                     url: "https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h",
                  },
                  {
                     name: "[oss-security] 20211122 Re: CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable",
                     refsource: "MLIST",
                     tags: [
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                     ],
                     url: "http://www.openwall.com/lists/oss-security/2021/11/22/2",
                  },
                  {
                     name: "[oss-security] 20211122 CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable",
                     refsource: "MLIST",
                     tags: [
                        "Mailing List",
                        "Third Party Advisory",
                     ],
                     url: "http://www.openwall.com/lists/oss-security/2021/11/22/1",
                  },
                  {
                     name: "[oss-security] 20211123 Re: CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable",
                     refsource: "MLIST",
                     tags: [
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                        "Third Party Advisory",
                     ],
                     url: "http://www.openwall.com/lists/oss-security/2021/11/23/1",
                  },
               ],
            },
         },
         impact: {
            baseMetricV2: {
               acInsufInfo: false,
               cvssV2: {
                  accessComplexity: "LOW",
                  accessVector: "NETWORK",
                  authentication: "NONE",
                  availabilityImpact: "NONE",
                  baseScore: 5,
                  confidentialityImpact: "PARTIAL",
                  integrityImpact: "NONE",
                  vectorString: "AV:N/AC:L/Au:N/C:P/I:N/A:N",
                  version: "2.0",
               },
               exploitabilityScore: 10,
               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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