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{"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": "Will not fix", "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": "Will not fix", "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", "upstream_fix": "httplib2 0.19.0"}