CVE-2023-0286 Information
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There is a type confusion vulnerability relating to X.400 address processing inside an X.509 GeneralName. X.400 addresses were parsed as an ASN1_STRING but the public structure definition for GENERAL_NAME incorrectly specified the type of the x400Address field as ASN1_TYPE. This field is subsequently interpreted by the OpenSSL function GENERAL_NAME_cmp as an ASN1_TYPE rather than an ASN1_STRING. When CRL checking is enabled (i.e. the application sets the X509_V_FLAG_CRL_CHECK flag) this vulnerability may allow an attacker to pass arbitrary pointers to a memcmp call enabling them to read memory contents or enact a denial of service. In most cases the attack requires the attacker to provide both the certificate chain and CRL neither of which need to have a valid signature. If the attacker only controls one of these inputs the other input must already contain an X.400 address as a CRL distribution point which is uncommon. As such this vulnerability is most likely to only affect applications which have implemented their own functionality for retrieving CRLs over a network.