CVE-2023-0286 X.400 address type confusion in X.509 GeneralName

2023-02-0819:01:50

openssl

www.cve.org

7.7 High

AI Score

Confidence

High

0.003 Low

EPSS

Percentile

65.5%

JSON

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.

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "product": "OpenSSL",
    "vendor": "OpenSSL",
    "versions": [
      {
        "lessThan": "3.0.8",
        "status": "affected",
        "version": "3.0.0",
        "versionType": "semver"
      },
      {
        "lessThan": "1.1.1t",
        "status": "affected",
        "version": "1.1.1",
        "versionType": "custom"
      },
      {
        "lessThan": "1.0.2zg",
        "status": "affected",
        "version": "1.0.2",
        "versionType": "custom"
      }
    ]
  }
]