Test ID:	1.3.6.1.4.1.25623.1.0.145654
Category:	General
Title:	OpenSSL: CA Certificate Check Bypass Vulnerability (CVE-2021-3450) - Linux
Summary:	OpenSSL is prone to a CA certificate check bypass vulnerability.
Description:	Summary: OpenSSL is prone to a CA certificate check bypass vulnerability. Vulnerability Insight: 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. Affected Software/OS: OpenSSL version 1.1.1h through 1.1.1j. Solution: Update to version 1.1.1k or later. CVSS Score: 5.8 CVSS Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2021-3450 Cisco Security Advisory: 20210325 Multiple Vulnerabilities in OpenSSL Affecting Cisco Products: March 2021 https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-openssl-2021-GHY28dJd https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2a40b7bc7b94dd7de897a74571e7024f0cf0d63b https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44845 https://kc.mcafee.com/corporate/index?page=content&id=SB10356 https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0013 https://security.netapp.com/advisory/ntap-20210326-0006/ https://www.openssl.org/news/secadv/20210325.txt https://www.tenable.com/security/tns-2021-05 https://www.tenable.com/security/tns-2021-08 https://www.tenable.com/security/tns-2021-09 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CCBFLLVQVILIVGZMBJL3IXZGKWQISYNP/ https://security.gentoo.org/glsa/202103-03 https://mta.openssl.org/pipermail/openssl-announce/2021-March/000198.html https://security.FreeBSD.org/advisories/FreeBSD-SA-21:07.openssl.asc https://www.oracle.com//security-alerts/cpujul2021.html https://www.oracle.com/security-alerts/cpuApr2021.html https://www.oracle.com/security-alerts/cpuapr2022.html https://www.oracle.com/security-alerts/cpujul2022.html https://www.oracle.com/security-alerts/cpuoct2021.html http://www.openwall.com/lists/oss-security/2021/03/27/1 http://www.openwall.com/lists/oss-security/2021/03/27/2 http://www.openwall.com/lists/oss-security/2021/03/28/3 http://www.openwall.com/lists/oss-security/2021/03/28/4
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