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{"bugzilla": {"description": "nss: Information exposure when DH secret are reused across multiple TLS connections", "id": "1877557", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1877557"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-385->CWE-200", "details": ["The Raccoon attack is a timing attack on DHE ciphersuites inherit in the TLS specification. To mitigate this vulnerability, Firefox disabled support for DHE ciphersuites.", "A flaw was found in Mozilla nss. A raccoon attack exploits a flaw in the TLS specification which can lead to an attacker being able to compute the pre-master secret in connections which have used a Diffie-Hellman(DH) based ciphersuite. In such a case this would result in the attacker being able to eavesdrop on all encrypted communications sent over that TLS connection. The highest threat from this vulnerability is to data confidentiality."], "mitigation": {"lang": "en:us", "value": "Any risk involving the ECDHE key reuse on the nss server can be mitigated by setting the SSL_REUSE_SERVER_ECDHE_KEY socket option to PR_FALSE."}, "name": "CVE-2020-12413", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "nss", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "nss", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "nss", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "nss", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "nss", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2020-09-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-12413\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-12413\nhttps://raccoon-attack.com/RacoonAttack.pdf"], "statement": "NSS as shipped with Red Hat Enterprise Linux 6, 7, and 8 does not re-use Diffie-Hellman Ephemeral (DHE) keys. It reuses Elliptic Curve Diffie-Hellman Ephemeral (ECDHE) keys by default, but Attacking ECDH and ECDHE cipher suites are not in the scope of the Raccoon Attack and generally considered to be unaffected [1]. Further, reuse of ECDHE keys can be disabled starting in nss 3.17 [2].\nFor these reasons, Red Hat Product Security has marked the Severity of this flaw as Low. Please see [3] for more information about Low Severity ratings.\n1. https://raccoon-attack.com/RacoonAttack.pdf pg. 13\n2. https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.17_release_notes\n3. https://access.redhat.com/security/updates/classification", "threat_severity": "Low"}