Access of Resource Using Incompatible Type ('Type Confusion') Affecting openssl package, versions <1.1.1n-0+deb11u4



    Attack Complexity High
    Confidentiality High
    Availability High

    Threat Intelligence

    EPSS 0.21% (58th percentile)
Expand this section
7.4 high
Expand this section
7.4 high
Expand this section
Red Hat
7.4 high

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  • Snyk ID SNYK-DEBIAN11-OPENSSL-3314584
  • published 8 Feb 2023
  • disclosed 8 Feb 2023

How to fix?

Upgrade Debian:11 openssl to version 1.1.1n-0+deb11u4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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.