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              "value": "Issue summary: A bug has been identified in the processing of key and\u003cbr\u003einitialisation vector (IV) lengths.  This can lead to potential truncation\u003cbr\u003eor overruns during the initialisation of some symmetric ciphers.\u003cbr\u003e\u003cbr\u003eImpact summary: A truncation in the IV can result in non-uniqueness,\u003cbr\u003ewhich could result in loss of confidentiality for some cipher modes.\u003cbr\u003e\u003cbr\u003eWhen calling EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2() or\u003cbr\u003eEVP_CipherInit_ex2() the provided OSSL_PARAM array is processed after\u003cbr\u003ethe key and IV have been established.  Any alterations to the key length,\u003cbr\u003evia the \"keylen\" parameter or the IV length, via the \"ivlen\" parameter,\u003cbr\u003ewithin the OSSL_PARAM array will not take effect as intended, potentially\u003cbr\u003ecausing truncation or overreading of these values.  The following ciphers\u003cbr\u003eand cipher modes are impacted: RC2, RC4, RC5, CCM, GCM and OCB.\u003cbr\u003e\u003cbr\u003eFor the CCM, GCM and OCB cipher modes, truncation of the IV can result in\u003cbr\u003eloss of confidentiality.  For example, when following NIST\u0027s SP 800-38D\u003cbr\u003esection 8.2.1 guidance for constructing a deterministic IV for AES in\u003cbr\u003eGCM mode, truncation of the counter portion could lead to IV reuse.\u003cbr\u003e\u003cbr\u003eBoth truncations and overruns of the key and overruns of the IV will\u003cbr\u003eproduce incorrect results and could, in some cases, trigger a memory\u003cbr\u003eexception.  However, these issues are not currently assessed as security\u003cbr\u003ecritical.\u003cbr\u003e\u003cbr\u003eChanging the key and/or IV lengths is not considered to be a common operation\u003cbr\u003eand the vulnerable API was recently introduced. Furthermore it is likely that\u003cbr\u003eapplication developers will have spotted this problem during testing since\u003cbr\u003edecryption would fail unless both peers in the communication were similarly\u003cbr\u003evulnerable. For these reasons we expect the probability of an application being\u003cbr\u003evulnerable to this to be quite low. However if an application is vulnerable then\u003cbr\u003ethis issue is considered very serious. For these reasons we have assessed this\u003cbr\u003eissue as Moderate severity overall.\u003cbr\u003e\u003cbr\u003eThe OpenSSL SSL/TLS implementation is not affected by this issue.\u003cbr\u003e\u003cbr\u003eThe OpenSSL 3.0 and 3.1 FIPS providers are not affected by this because\u003cbr\u003ethe issue lies outside of the FIPS provider boundary.\u003cbr\u003e\u003cbr\u003eOpenSSL 3.1 and 3.0 are vulnerable to this issue."
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