Huawei EulerOS: CVE-2023-0286: shim security update

Huawei EulerOS: CVE-2023-0286: shim security update

Severity

9

CVSS

(AV:N/AC:M/Au:N/C:C/I:N/A:C)

Published

02/08/2023

Created

05/10/2023

Added

05/10/2023

Modified

01/28/2025

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.

Solution(s)

• huawei-euleros-2_0_sp9-upgrade-shim

References

• https://attackerkb.com/topics/cve-2023-0286
• CVE - 2023-0286
• EulerOS-SA-2023-1878