OpenSSL Improper Certificate Validation Vulnerability - CVE-2019-1552

OpenSSL has internal defaults for a directory tree where it can find a configuration file as well as certificates used for verification in TLS. This directory is most commonly referred to as OPENSSLDIR and is configurable with the --prefix / --openssldir configuration options. For OpenSSL versions 1.1.0 and 1.1.1 the mingw configuration targets assume that resulting programs and libraries are installed in a Unix-like environment and the default prefix for program installation as well as for OPENSSLDIR should be 39/usr/local39. However mingw programs are Windows programs and as such find themselves looking at sub-directories of 39C:/usr/local39 which may be world writable which enables untrusted users to modify OpenSSL39s default configuration insert CA certificates modify (or even replace) existing engine modules etc. For OpenSSL 1.0.2 39/usr/local/ssl39 is used as default for OPENSSLDIR on all Unix and Windows targets including Visual C builds. However some build instructions for the diverse Windows targets on 1.0.2 encourage you to specify your own --prefix. OpenSSL versions 1.1.1 1.1.0 and 1.0.2 are affected by this issue. Due to the limited scope of affected deployments this has been assessed as low severity and therefore we are not creating new releases at this time. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).