CVE-2021-3450 Detail

Current Description

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).


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
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


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2021/03/27/1 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/03/27/2 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/03/28/3 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/03/28/4 Mailing List  Third Party Advisory 
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2a40b7bc7b94dd7de897a74571e7024f0cf0d63b Mailing List  Patch  Vendor Advisory 
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845
https://kc.mcafee.com/corporate/index?page=content&id=SB10356 Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP/ Third Party Advisory 
https://mta.openssl.org/pipermail/openssl-announce/2021-March/000198.html Mailing List  Vendor Advisory 
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013
https://security.FreeBSD.org/advisories/FreeBSD-SA-21:07.openssl.asc Third Party Advisory 
https://security.gentoo.org/glsa/202103-03 Third Party Advisory 
https://security.netapp.com/advisory/ntap-20210326-0006/ Third Party Advisory 
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJd Third Party Advisory 
https://www.openssl.org/news/secadv/20210325.txt Vendor Advisory 
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.oracle.com/security-alerts/cpuApr2021.html Patch  Third Party Advisory 
https://www.tenable.com/security/tns-2021-05 Third Party Advisory 
https://www.tenable.com/security/tns-2021-08 Third Party Advisory 
https://www.tenable.com/security/tns-2021-09 Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-295 Improper Certificate Validation cwe source acceptance level NIST  

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Change History

21 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3450
NVD Published Date:
03/25/2021
NVD Last Modified:
07/20/2021
Source:
OpenSSL Software Foundation