Affected: OpenSSL

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.

Affected: Ubuntu:18.04:LTS: openssl, Ubuntu:20.04:LTS: openssl, Ubuntu:22.04:LTS: openssl

David Benjamin discovered that OpenSSL incorrectly handled X.400 address processing. A remote attacker could possibly use this issue to read arbitrary memory contents or cause OpenSSL to crash, resulting in a denial of service. (CVE-2023-0286)

Corey Bonnell discovered that OpenSSL incorrectly handled X.509 certificate verification. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS and Ubuntu 22.10. (CVE-2022-4203)

Hubert Kario discovered that OpenSSL had a timing based side channel in the OpenSSL RSA Decryption implementation. A remote attacker could possibly use this issue to recover sensitive information. (CVE-2022-4304)

Dawei Wang discovered that OpenSSL incorrectly handled parsing certain PEM data. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2022-4450)

Octavio Galland and Marcel Böhme discovered that OpenSSL incorrectly handled streaming ASN.1 data. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2023-0215)

Marc Schönefeld discovered that OpenSSL incorrectly handled malformed PKCS7 data. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS and Ubuntu 22.10. (CVE-2023-0216)

Kurt Roeckx discovered that OpenSSL i…