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{"bugzilla": {"description": "curl: Cipher settings shared for all connections when using schannel TLS backed", "id": "1964904", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1964904"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-295", "details": ["curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single \"static\" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.", "A flaw was found in curl where libcurl lets applications specify which specific TLS ciphers to use in transfers, using the option called CURLOPT_SSL_CIPHER_LIST. The cipher selection is used for the TLS negotiation when a transfer is done involving any of the TLS based transfer protocols libcurl supports, such as HTTPS, FTPS, IMAPS, POP3S, SMTPS, etc. Due to a mistake in the code, the selected cipher set was stored in a single \"static\" variable in the library, which contains a side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly. The highest threat from this vulnerability is to confidentiality."], "name": "CVE-2021-22897", "package_state": [{"cpe": "cpe:/a:redhat:rhel_dotnet:2.1", "fix_state": "Not affected", "package_name": "rh-dotnet21-curl", "product_name": ".NET Core 2.1 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:rhel_dotnet:3.1", "fix_state": "Not affected", "package_name": "rh-dotnet31-curl", "product_name": ".NET Core 3.1 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:ceph_storage:2", "fix_state": "Out of support scope", "package_name": "curl", "product_name": "Red Hat Ceph Storage 2"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Not affected", "package_name": "httpd24-curl", "product_name": "Red Hat Software Collections"}], "public_date": "2021-05-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-22897\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-22897\nhttps://curl.se/docs/CVE-2021-22897.html"], "threat_severity": "Low", "upstream_fix": "curl 7.77.0"}