PowerMTA v4.0r15 is now available and includes the OpenSSL Heartbleed bug fix. As always, the new version can be downloaded from the Port25 customer portal. The PowerMTA Management Console does not include the OpenSSL libraries, and as such is not affected by this bug. Given the general security risks in this bug, it is highly recommended to upgrade PowerMTA, and all applications that use OpenSSL, at your earliest convenience.
On April 7thth, 2014, there was a bug found in the popular OpenSSL open source library that PowerMTA and most everyone on the internet uses to encrypt data. This bug is commonly known as the Heartbleed Bug and is considered widespread, affecting open source web servers like Apache and NGINX.
From the Heartbleed Bug Site:
The Heartbleed Bug is a serious vulnerability in the popular OpenSSL cryptographic software library. This weakness allows stealing the information protected, under normal conditions, by the SSL/TLS encryption used to secure the Internet. SSL/TLS provides communication security and privacy over the Internet for applications such as web, email, instant messaging (IM) and some virtual private networks (VPNs).
The Heartbleed bug allows anyone on the Internet to read the memory of the systems protected by the vulnerable versions of the OpenSSL software. This compromises the secret keys used to identify the service providers and to encrypt the traffic, the names and passwords of the users and the actual content. This allows attackers to eavesdrop on communications, steal data directly from the services and users and to impersonate services and users.