New severity level, "Critical"

We’ve just added a new severity level called “critical severity” to our security policy. When we first introduced the policy, over a year ago, we just had three levels, “Low”, “Moderate”, and “High”. So why did we add “Critical” and why are we not using someone else’s standard definitions? After introducing the new policy we started giving everyone a headsup when we were due to release OpenSSL updates that included security fixes.

OpenSSL Security: A Year in Review

Over the last 10 years, OpenSSL has published advisories on over 100 vulnerabilities. Many more were likely silently fixed in the early days, but in the past year our goal has been to establish a clear public record. In September 2014, the team adopted a security policy that defines how we handle vulnerability reports. One year later, I’m very happy to conclude that our policy is enforced, and working well.

Logjam, FREAK and upcoming changes in OpenSSL

Today, news broke of Logjam, an attack on TLS connections using Diffie-Hellman ciphersuites. To protect OpenSSL-based clients, we’re increasing the minimum accepted DH key size to 768 bits immediately in the next release, and to 1024 bits soon after. We have also made several other changes to strengthen our cryptographic defaults and have updated our tools and documentation to help servers configure Diffie-Hellman ciphersuites securely - see below for details.