CVE-2021-43557

{"containers": {"cna": {"affected": [{"product": "Apache APISIX", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "Apache APISIX 1.5*", "status": "affected", "version": "1.5", "versionType": "custom"}]}], "descriptions": [{"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."}], "metrics": [{"other": {"content": {"other": "moderate"}, "type": "unknown"}}], "problemTypes": [{"descriptions": [{"description": "Use Nginx's $request_uri variable without verification", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-11-23T12:06:15.000Z", "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h"}, {"name": "[oss-security] 20211122 CVE-2021-43557: Apache APISIX: Path traversal in request_uri variable", "tags": ["mailing-list", "x_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", "tags": ["mailing-list", "x_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", "tags": ["mailing-list", "x_refsource_MLIST"], "url": "http://www.openwall.com/lists/oss-security/2021/11/23/1"}], "source": {"discovery": "UNKNOWN"}, "title": "Path traversal in request_uri variable", "workarounds": [{"lang": "en", "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."}], "x_generator": {"engine": "Vulnogram 0.0.9"}, "x_legacyV4Record": {"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. 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Upgrade to APISIX 2.10.2, or apply this commit which provides a normalized $request_uri: https://github.com/apache/apisix/commit/9fc38330e82ce46e2aaabceef7d61708c91782db\n2. 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{"affected": [{"affectedData": [{"product": "Apache APISIX", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "Apache APISIX 1.5*", "status": "affected", "version": "1.5", "versionType": "custom"}]}], "source": "security@apache.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*", "matchCriteriaId": "E6E300E2-7036-4813-B7A7-48F922753C76", "versionEndExcluding": "2.10.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"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."}, {"lang": "es", "value": "El plugin uri-block en Apache APISIX versiones anteriores a 2.10.2, usa $request_uri sin verificaci\u00f3n. La $request_uri es la URI original completa de la petici\u00f3n sin normalizar. Esto hace posible construir un URI para evitar la lista de bloqueo en algunas ocasiones. Por ejemplo, cuando la lista de bloqueo contiene \"^/internal/\", puede usarse una URI como \"//internal/\" para omitirla. Algunos otros plugins tambi\u00e9n presentan el mismo problema. Y puede afectar al plugin personalizado del desarrollador"}], "id": "CVE-2021-43557", "lastModified": "2026-06-17T04:11:07.910", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"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, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"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, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-11-22T09:15:07.627", "references": [{"source": "security@apache.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/11/22/1"}, {"source": "security@apache.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/11/22/2"}, {"source": "security@apache.org", "tags": ["Exploit", "Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/11/23/1"}, {"source": "security@apache.org", "tags": ["Exploit", "Mailing List", "Vendor Advisory"], "url": "https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/11/22/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/11/22/2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2021/11/23/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mailing List", "Vendor Advisory"], "url": "https://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-77"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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