CVE-2021-21240

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This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m", "refsource": "CONFIRM", "url": "https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m"}, {"name": "https://github.com/httplib2/httplib2/pull/182", "refsource": "MISC", "url": "https://github.com/httplib2/httplib2/pull/182"}, {"name": "https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc", "refsource": "MISC", "url": "https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc"}, {"name": "https://pypi.org/project/httplib2", "refsource": "MISC", "url": "https://pypi.org/project/httplib2"}]}, "source": {"advisory": "GHSA-93xj-8mrv-444m", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T18:09:14.827Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/httplib2/httplib2/pull/182"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://pypi.org/project/httplib2"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-21240", "datePublished": "2021-02-08T19:45:19.000Z", "dateReserved": "2020-12-22T00:00:00.000Z", "dateUpdated": "2024-08-03T18:09:14.827Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "httplib2", "vendor": "httplib2", "versions": [{"status": "affected", "version": "< 0.19.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:httplib2_project:httplib2:*:*:*:*:*:python:*:*", "matchCriteriaId": "D5BA135E-6889-4A5D-88F6-1AD4DBC498BE", "versionEndExcluding": "0.19.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of \"\\xa0\" characters in the \"www-authenticate\" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library."}, {"lang": "es", "value": "httplib2 es una biblioteca cliente HTTP completa para Python.&#xa0;En httplib2 anterior a la versi\u00f3n 0.19.0, un servidor malicioso que responde con una larga serie de caracteres \"\\xa0\" en el encabezado \"www-authenticate\" puede causar una Denegaci\u00f3n de Servicio (CPU quemada mientras analiza el encabezado) del cliente httplib2 que accede a dicho servidor.&#xa0;Esto se corrigi\u00f3 en la versi\u00f3n 0.19.0, que contiene una nueva implementaci\u00f3n de an\u00e1lisis de encabezados de autenticaci\u00f3n usando la biblioteca pyparsing"}], "id": "CVE-2021-21240", "lastModified": "2026-06-17T03:35:06.433", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "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": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-02-08T20:15:12.197", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/httplib2/httplib2/pull/182"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "url": "https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m"}, {"source": "security-advisories@github.com", "tags": ["Product", "Third Party Advisory"], "url": "https://pypi.org/project/httplib2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/httplib2/httplib2/pull/182"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "url": "https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Product", "Third Party Advisory"], "url": "https://pypi.org/project/httplib2"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2021:2116", "cpe": "cpe:/a:redhat:openstack:16.1::el8", "package": "python-httplib2-0:0.13.1-2.el8ost", "product_name": "Red Hat OpenStack Platform 16.1", "release_date": "2021-05-26T00:00:00Z"}], "bugzilla": {"description": "python-httplib2: Regular expression denial of service via malicious header", "id": "1926885", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1926885"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-400", "details": ["httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of \"\\xa0\" characters in the \"www-authenticate\" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library.", "An uncontrolled resource consumption flaw as found in python-httplib2, due to a flawed regular expression used while parsing the WWW-Authenticate header in an HTTP response. This flaw allows a malicious or compromised server to reply with a crafted sequence of characters in the WWW-Authenticate header, leading to a denial of service of the httplib2 client accessing the server. The highest threat from this vulnerability is to system availability."], "mitigation": {"lang": "en:us", "value": "Use strict mode to parse WWW-Authenticate headers. This can be done by setting `httplib2.USE_WWW_AUTH_STRICT_PARSING = True`. Please note, however, that strict mode might lead to bad results in case of ill-formed header values."}, "name": "CVE-2021-21240", "package_state": [{"cpe": "cpe:/a:redhat:ceph_storage:2", "fix_state": "Out of support scope", "package_name": "python-httplib2", "product_name": "Red Hat Ceph Storage 2"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "fence-agents", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "python-httplib2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "python-httplib2", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openstack:10", "fix_state": "Out of support scope", "package_name": "python-httplib2", "product_name": "Red Hat OpenStack Platform 10 (Newton)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Will not fix", "package_name": "python-httplib2", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:storage:3", "fix_state": "Affected", "package_name": "python-httplib2", "product_name": "Red Hat Storage 3"}, {"cpe": "cpe:/a:redhat:rhui:3", "fix_state": "Fix deferred", "impact": "low", "package_name": "python-httplib2", "product_name": "Red Hat Update Infrastructure 3 for Cloud Providers"}], "public_date": "2021-01-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-21240\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-21240\nhttps://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m"], "statement": "This flaw has been rated as having a security impact of Low, because it requires a malicious or compromised server in order to be exploited, and it only affects the HTTP client. In Red Hat OpenStack Platform 13, because the flaw has a lower impact and the fix would require a substantial amount of development, no update will be provided at this time for the RHOSP 13 python-httplib2 package.", "threat_severity": "Low"}

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