The function X509_to_X509_REQ will crash with a NULL pointer dereference if the certificate key is invalid. This function is rarely used in practice.
This issue affects all current OpenSSL versions: 1.0.2, 1.0.1, 1.0.0 and 0.9.8.
OpenSSL 1.0.2 users should upgrade to 1.0.2a OpenSSL 1.0.1 users should upgrade to 1.0.1m. OpenSSL 1.0.0 users should upgrade to 1.0.0r. OpenSSL 0.9.8 users should upgrade to 0.9.8zf.
This issue was discovered by Brian Carpenter and a fix developed by Stephen Henson of the OpenSSL development team.
As per our previous announcements and our Release Strategy (https://www.openssl.org/about/releasestrat.html), support for OpenSSL versions 1.0.0 and 0.9.8 will cease on 31st December 2015. No security updates for these releases will be provided after that date. Users of these releases are advised to upgrade.
URL for this Security Advisory: https://www.openssl.org/news/secadv_20150319.txt
Note: the online version of the advisory may be updated with additional details over time.
For details of OpenSSL severity classifications-*