Updated: 2024-02-04 19:16:19.046393


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.



Severity Score
CVSS Version 2.x 0
CVSS Version 3.x HIGH 7.4


OS name Project name Version Score Severity Status Errata Last updated
AlmaLinux 9.2 ESU openssl 3.0.7 7.4 HIGH Already Fixed 2023-11-08 08:35:53
AlmaLinux 9.2 FIPS openssl 3.0.7 7.4 HIGH Already Fixed 2023-11-27 10:09:02
CentOS 6 ELS openssl 1.0.1e 7.4 HIGH Released CLSA-2023:1676025596 2023-02-22 13:03:46
CentOS 8.4 ELS openssl 1.1.1g 7.4 HIGH Released CLSA-2023:1676026152 2023-02-10 07:37:55
CentOS 8.5 ELS openssl 1.1.1k 7.4 HIGH Released CLSA-2023:1676026276 2023-02-10 07:37:55
CloudLinux 6 ELS openssl 1.0.1e 7.4 HIGH Released CLSA-2023:1676025808 2023-02-22 13:03:47
Oracle Linux 6 ELS openssl 1.0.1e 7.4 HIGH Released CLSA-2023:1676025915 2023-02-10 07:37:55
Ubuntu 16.04 ELS openssl 1.0.2g-1 7.4 HIGH Released CLSA-2023:1676026057 2023-02-10 07:37:55
Ubuntu 18.04 ELS openssl 1.1.1-1 7.4 HIGH Already Fixed 2023-10-31 09:33:52