CVE-2020-5236

{"containers": {"cna": {"affected": [{"product": "Waitress", "vendor": "Pylons", "versions": [{"status": "affected", "version": "= 1.4.2"}]}], "descriptions": [{"lang": "en", "value": "Waitress version 1.4.2 allows a DOS attack When waitress receives a header that contains invalid characters. When a header like \"Bad-header: xxxxxxxxxxxxxxx\\x10\" is received, it will cause the regular expression engine to catastrophically backtrack causing the process to use 100% CPU time and blocking any other interactions. This allows an attacker to send a single request with an invalid header and take the service offline. This issue was introduced in version 1.4.2 when the regular expression was updated to attempt to match the behaviour required by errata associated with RFC7230. The regular expression that is used to validate incoming headers has been updated in version 1.4.3, it is recommended that people upgrade to the new version of Waitress as soon as possible."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "description": "CWE-400: Uncontrolled Resource Consumption", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2020-02-04T03:05:14.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f"}], "source": {"advisory": "GHSA-73m2-3pwg-5fgc", "discovery": "UNKNOWN"}, "title": "Catastrophic backtracking in regex allows Denial of Service in Waitress", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2020-5236", "STATE": "PUBLIC", "TITLE": "Catastrophic backtracking in regex allows Denial of Service in Waitress"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Waitress", "version": {"version_data": [{"version_value": "= 1.4.2"}]}}]}, "vendor_name": "Pylons"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Waitress version 1.4.2 allows a DOS attack When waitress receives a header that contains invalid characters. When a header like \"Bad-header: xxxxxxxxxxxxxxx\\x10\" is received, it will cause the regular expression engine to catastrophically backtrack causing the process to use 100% CPU time and blocking any other interactions. This allows an attacker to send a single request with an invalid header and take the service offline. This issue was introduced in version 1.4.2 when the regular expression was updated to attempt to match the behaviour required by errata associated with RFC7230. The regular expression that is used to validate incoming headers has been updated in version 1.4.3, it is recommended that people upgrade to the new version of Waitress as soon as possible."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-400: Uncontrolled Resource Consumption"}]}]}, "references": {"reference_data": [{"name": "https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc", "refsource": "CONFIRM", "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc"}, {"name": "https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f", "refsource": "MISC", "url": "https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f"}]}, "source": {"advisory": "GHSA-73m2-3pwg-5fgc", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T08:22:09.008Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2020-5236", "datePublished": "2020-02-04T03:05:14.000Z", "dateReserved": "2020-01-02T00:00:00.000Z", "dateUpdated": "2024-08-04T08:22:09.008Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

{"affected": [{"affectedData": [{"product": "Waitress", "vendor": "Pylons", "versions": [{"status": "affected", "version": "= 1.4.2"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:agendaless:waitress:1.4.2:*:*:*:*:*:*:*", "matchCriteriaId": "3C433875-4299-4F58-AB6A-D7E9A815329B", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Waitress version 1.4.2 allows a DOS attack When waitress receives a header that contains invalid characters. When a header like \"Bad-header: xxxxxxxxxxxxxxx\\x10\" is received, it will cause the regular expression engine to catastrophically backtrack causing the process to use 100% CPU time and blocking any other interactions. This allows an attacker to send a single request with an invalid header and take the service offline. This issue was introduced in version 1.4.2 when the regular expression was updated to attempt to match the behaviour required by errata associated with RFC7230. The regular expression that is used to validate incoming headers has been updated in version 1.4.3, it is recommended that people upgrade to the new version of Waitress as soon as possible."}, {"lang": "es", "value": "Waitress versi\u00f3n 1.4.2, permite un ataque de DOS cuando waitress recibe un encabezado que contiene caracteres no v\u00e1lidos. Cuando un encabezado como \"Bad-header: xxxxxxxxxxxxxxx\\x10\" es recibido, causar\u00e1 que el motor de expresi\u00f3n regular retroceda catastr\u00f3ficamente, provocando que el proceso utilice el 100% del tiempo de CPU y bloquee cualquier otras interacciones. Esto permite a un atacante enviar una \u00fanica petici\u00f3n con un encabezado no v\u00e1lido y desconectar el servicio. Este problema fue introducido en la versi\u00f3n 1.4.2 cuando se actualiz\u00f3 la expresi\u00f3n regular para intentar hacer coincidir el comportamiento requerido por las erratas asociadas con RFC7230. La expresi\u00f3n regular que se usa para comprobar los encabezados entrantes se actualiz\u00f3 en la versi\u00f3n 1.4.3, se recomienda que las personas actualicen a la nueva versi\u00f3n de Waitress tan pronto como sea posible."}], "id": "CVE-2020-5236", "lastModified": "2026-06-17T03:21:05.140", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "COMPLETE", "baseScore": 6.8, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:C", "version": "2.0"}, "exploitabilityScore": 8.0, "impactScore": 6.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-02-04T03:15:10.750", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-400"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "waitress: header with invalid characters can lead to DoS", "id": "1831068", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1831068"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-400", "details": ["Waitress version 1.4.2 allows a DOS attack When waitress receives a header that contains invalid characters. When a header like \"Bad-header: xxxxxxxxxxxxxxx\\x10\" is received, it will cause the regular expression engine to catastrophically backtrack causing the process to use 100% CPU time and blocking any other interactions. This allows an attacker to send a single request with an invalid header and take the service offline. This issue was introduced in version 1.4.2 when the regular expression was updated to attempt to match the behaviour required by errata associated with RFC7230. The regular expression that is used to validate incoming headers has been updated in version 1.4.3, it is recommended that people upgrade to the new version of Waitress as soon as possible.", "A flaw was found in the regex used to process HTTP Headers in python-waitress and is vulnerable to catastrophic backtracking. This flaw allows an attacker with the ability to send HTTP requests to a vulnerable server to cause a denial of service attack."], "name": "CVE-2020-5236", "package_state": [{"cpe": "cpe:/a:redhat:ceph_storage:3", "fix_state": "Not affected", "package_name": "python-waitress", "product_name": "Red Hat Ceph Storage 3"}, {"cpe": "cpe:/a:redhat:ceph_storage:4", "fix_state": "Not affected", "package_name": "python-waitress", "product_name": "Red Hat Ceph Storage 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "python-waitress", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Not affected", "package_name": "python-waitress", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:15", "fix_state": "Out of support scope", "impact": "low", "package_name": "python-waitress", "product_name": "Red Hat OpenStack Platform 15 (Stein)"}, {"cpe": "cpe:/a:redhat:openstack:16", "fix_state": "Fix deferred", "impact": "low", "package_name": "python-waitress", "product_name": "Red Hat OpenStack Platform 16 (Train)"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Not affected", "package_name": "python-waitress", "product_name": "Red Hat Quay 3"}], "public_date": "2020-02-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-5236\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-5236\nhttps://docs.pylonsproject.org/projects/waitress/en/latest/#id1"], "statement": "* OpenShift Container Platform 4 uses an earlier version of python-waitress which is not affected by this vulnerability.\n* Red Hat Quay uses an earlier version of python-waitress which is not affected by this vulnerability.\n* Red Hat OpenStack Platform 15 and 16 ship but do not use the flawed version of python-waitress. The impact for these products is therefore rated as having a security impact of Low. (Earlier versions of RHOSP do not ship the flawed code.)\n* This issue did not affect Red Hat Ceph Storage 3 and 4 as the vulnerable code is not present in the shipped version of python-waitress.", "threat_severity": "Moderate"}

{}