Vulnerability in Freebsd
CVE-2021-3450
The X509_V_FLAG_X509_STRICT flag enables additional security checks of the certificates present in a certificate chain. It is not set by default. Starting from OpenSSL version 1.1.1h a check to disallow certificates in the chain that have explicitly encoded elliptic curve parameters was added as an additional strict check. An error in the implementation of this check meant that the result of a previous check to confirm that certificates in the chain are valid CA certificates was overwritten. This effectively bypasses the check that non-CA certificates must not be able to issue other certificates. If a "purpose" has been configured then there is a subsequent opportunity for checks that the certificate is a valid CA. All of the named "purpose" values implemented in libcrypto perform this check. Therefore, where a purpose is set the certificate chain will still be rejected even when the strict flag has been used. A purpose is set by default in libssl client and server certificate verification routines, but it can be overridden or removed by an application. In order to be affected, an application must explicitly set the X509_V_FLAG_X509_STRICT verification flag and either not set a purpose for the certificate verification or, in the case of TLS client or server applications, override the default purpose. OpenSSL versions 1.1.1h and newer are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1h-1.1.1j).
Vulnerability class: Improper Certificate Validation
EPSS: 0.183 (96.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Freebsd — versions 12.2
- Mcafee Web_gateway — versions 8.2.19, 9.2.10, 10.1.1
- Mcafee Web_gateway_cloud_service — versions 8.2.19, 9.2.10, 10.1.1
- Netapp Cloud_volumes_ontap_mediator
- Netapp Oncommand_workflow_automation
- Netapp Ontap_select_deploy_administration_utility
- Netapp Santricity_smi-s_provider
- Netapp Santricity_smi-s_provider_firmware
- Netapp Storagegrid
- Netapp Storagegrid_firmware
Weakness classification (CWE)
Public proof-of-concept exploits
References
- openssl-security@openssl.org (x_refsource_CONFIRM, Vendor Advisory)
- openssl-security@openssl.org (x_refsource_CONFIRM)
- openssl-security@openssl.org (x_refsource_CISCO, vendor-advisory, Third Party Advisory)
- openssl-security@openssl.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- openssl-security@openssl.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- openssl-security@openssl.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- openssl-security@openssl.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- openssl-security@openssl.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- openssl-security@openssl.org (x_refsource_FEDORA, vendor-advisory)
- openssl-security@openssl.org (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-3450?
- CVE-2021-3450 is a high-severity vulnerability in Freebsd, classified under Improper Certificate Validation. CVSS score: 7.4/10. Published 2021-03-25.
- How severe is CVE-2021-3450?
- High severity. CVSS v3 base score is 7.4 out of 10.
- Is CVE-2021-3450 known to be exploited?
- 20 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.