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              "value": "Issue Summary: An error in the callback used to verify the certificate\u003cbr\u003eprovided in a Root CA key update Certificate Management Protocol (CMP)\u003cbr\u003emessage response rendered the certificate validation ineffectual, which\u003cbr\u003ecould lead to escalation of credentials from the Registration Authority (RA)\u003cbr\u003elevel to the root Certification Authority (root CA) level.\u003cbr\u003e\u003cbr\u003eImpact Summary: The Registration Autority could replace the root CA\u003cbr\u003ecertificate for the CMP clients with an arbitrary root CA certificate.\u003cbr\u003e\u003cbr\u003eOne of the parts of the Certificate Management Protocol (CMP), specified in\u003cbr\u003eRFC 9810, is Root Certification Authority (root CA) key Rollover,\u003cbr\u003ewhich is sent by the server in a message with type \u0027id-it-rootCaKeyUpdate\u0027.\u003cbr\u003eAs part of these messages, \u0027newWithOld\u0027 certificate, the new root CA\u003cbr\u003ecertificate signed with the old root CA key, is provided, and verifying its\u003cbr\u003esignature is crucial for transferring the trust from the old CA key to the\u003cbr\u003enew one.\u003cbr\u003e\u003cbr\u003eThe \u0027id-it-rootCaKeyUpdate\u0027 messages are expected to be processed with\u003cbr\u003eOSSL_CMP_get1_rootCaKeyUpdate(), that is expected to verify the \u0027newWithOld\u0027\u003cbr\u003ecertificate.  A typo in the certificate chain building code led to adding\u003cbr\u003ean incorrect certificate (\u0027newWithOld\u0027 instead of \u0027oldRoot\u0027) to the\u003cbr\u003ecertificate chain, rendering the certificate verification process ineffectual\u003cbr\u003e(only the issuer name and the algorithm OIDs were verified by other parts\u003cbr\u003eof the verification code).\u003cbr\u003e\u003cbr\u003eAn attacker who already has credentials that satisfy the CMP message\u003cbr\u003eprotection checks can generate a new key pair and use a crafted self-signed\u003cbr\u003ecertificate in its \u0027id-it-rootCaKeyUpdate\u0027 CMP messages which affected CMP\u003cbr\u003eclients would accept as a new trust anchor.\u003cbr\u003e\u003cbr\u003eSignificant preconditions for the attack (having valid RA-level credentials)\u003cbr\u003eare the reason the issue was assigned Low severity.\u003cbr\u003e\u003cbr\u003eThe FIPS modules are not affected by this issue, as the affected code is\u003cbr\u003eoutside the OpenSSL FIPS module boundary."
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