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CVE-2021-3450

Status Candidate

Overview

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).

Related Files

Gentoo Linux Security Advisory 202103-03
Posted Mar 31, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202103-3 - Multiple vulnerabilities have been found in OpenSSL, the worst of which could allow remote attackers to cause a Denial of Service condition. Versions less than 1.1.1k are affected.

tags | advisory, remote, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2021-23840, CVE-2021-23841, CVE-2021-3449, CVE-2021-3450
MD5 | 07c6a7c57274c3e07d6e5c3532051d5e
Red Hat Security Advisory 2021-1024-01
Posted Mar 30, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-1024-01 - OpenSSL is a toolkit that implements the Secure Sockets Layer and Transport Layer Security protocols, as well as a full-strength general-purpose cryptography library. Issues addressed include bypass and null pointer vulnerabilities.

tags | advisory, vulnerability, protocol
systems | linux, redhat
advisories | CVE-2021-3449, CVE-2021-3450
MD5 | ad384095ef826a0f5bc31f9f3c62eaba
OpenSSL Toolkit 1.1.1k
Posted Mar 25, 2021
Site openssl.org

OpenSSL is a robust, fully featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols with full-strength cryptography world-wide.

Changes: Fixed a problem with verifying a certificate chain when using the X509_V_FLAG_X509_STRICT flag. Fixed an issue where an OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client.
tags | tool, encryption, protocol
systems | unix
advisories | CVE-2021-3449, CVE-2021-3450
MD5 | c4e7d95f782b08116afa27b30393dd27
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