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High severity7.4NVD Advisory· Published Feb 8, 2023· Updated Jun 17, 2026

CVE-2023-0286

CVE-2023-0286

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
cryptographyPyPI
>= 0.8.1, < 39.0.139.0.1
openssl-srccrates.io
< 111.25.0111.25.0
openssl-srccrates.io
>= 300.0.0, < 300.0.12300.0.12

Affected products

110

Patches

Vulnerability mechanics

References

13

News mentions

0

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