c161c69ca2
Fixed a problem with verifying a certificate chain when using the X509_V_FLAG_X509_STRICT flag. This 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. ([CVE-2021-3450]) Tomasz Mraz Fixed an issue where an OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. ([CVE-2021-3449]) Peter Kaestle and Samuel Sapalski |
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$NetBSD: README,v 1.3 2012/01/28 01:30:42 christos Exp $ Organization of Sources: This directory hierarchy is using an organization that separates crypto source for programs that we have obtained from external third parties (where NetBSD is not the primary maintainer) from the system source. This README file is derived from the README file in src/external. The hierarchy is grouped by license, and then package per license, and is organized as follows: crypto/external/ Makefile Descend into the license sub-directories. <license>/ Per-license sub-directories. Makefile Descend into the package sub-directories. <package>/ Per-package sub-directories. Makefile Build the package. dist/ The third-party source for a given package. bin/ lib/ sbin/ BSD makefiles "reach over" from these into "../dist/". This arrangement allows for packages to be easily disabled or excised as necessary, either on a per-license or per-package basis. The licenses currently used are: bsd BSD (or equivalent) licensed software, possibly with the "advertising clause". cpl Common Public License http://www.opensource.org/licenses/cpl1.0 If a package has components covered by different licenses (for example, GPL2 and the LGPL), use the <license> subdirectory for the more restrictive license. If a package allows the choice of a license to use, we'll generally use the less restrictive license. If in doubt about where a package should be located, please contact <core@NetBSD.org> for advice. Migration Strategy: Eventually src/dist (and associated framework in other base source directories) and src/gnu will be migrated to this hierarchy. Maintenance Strategy: The sources under src/crypto/external/<license>/<package>/dist/ are generally a combination of a published distribution plus changes that we submit to the maintainers and that are not yet published by them. Make sure all changes made to the external sources are submitted to the appropriate maintainer, but only after coordinating with the NetBSD maintainers.