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CVE-2021-3450

high · 7.4

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).

7.4
CVSS
18.3%
EPSS (exploit prob.)
97th
EPSS percentile
2021-03-25
Published

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CWE-295

Affected products

VendorProductAffected versions
opensslopenssl>= 1.1.1h, < 1.1.1k
freebsdfreebsd12.2
freebsdfreebsd12.2
freebsdfreebsd12.2
netappsantricity_smi-s_provider_firmwareall versions
netappsantricity_smi-s_providerall versions
netappstoragegrid_firmwareall versions
netappstoragegridall versions
windriverlinuxall versions
windriverlinux17.0
windriverlinux18.0
windriverlinux19.0
netappcloud_volumes_ontap_mediatorall versions
netapponcommand_workflow_automationall versions
netappontap_select_deploy_administration_utilityall versions
netappstoragegridall versions
fedoraprojectfedora34
tenablenessus<= 8.13.1
tenablenessus_agent>= 8.2.1, <= 8.2.3
tenablenessus_network_monitor5.11.0
tenablenessus_network_monitor5.11.1
tenablenessus_network_monitor5.12.0
tenablenessus_network_monitor5.12.1
tenablenessus_network_monitor5.13.0
oraclecommerce_guided_search11.3.2
oracleenterprise_manager_for_storage_management13.4.0.0
oraclegraalvm19.3.5
oraclegraalvm20.3.1.2
oraclegraalvm21.0.0.2
oraclejd_edwards_enterpriseone_tools< 9.2.6.0
oraclejd_edwards_world_securitya9.4
oraclemysql_connectors<= 8.0.23
oraclemysql_enterprise_monitor<= 8.0.23
oraclemysql_server<= 5.7.33
oraclemysql_server>= 8.0.15, <= 8.0.23
oraclemysql_workbench<= 8.0.23
oraclepeoplesoft_enterprise_peopletools>= 8.57, <= 8.59
oraclesecure_backup< 18.1.0.1.0
oraclesecure_global_desktop5.6
oracleweblogic_server12.2.1.4.0

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2021-3450