Apr 8 2014
CVE-2014-0160 – Heartbleed Bug
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.
What leaks in practice?
We have tested some of our own services from attacker’s perspective. We attacked ourselves from outside, without leaving a trace. Without using any privileged information or credentials we were able steal from ourselves the secret keys used for our X.509 certificates, user names and passwords, instant messages, emails and business critical documents and communication.
How to stop the leak?
As long as the vulnerable version of OpenSSL is in use it can be abused. Fixed OpenSSL has been released and now it has to be deployed. Operating system vendors and distribution, appliance vendors, independent software vendors have to adopt the fix and notify their users. Service providers and users have to install the fix as it becomes available for the operating systems, networked appliances and software they use.
Why it is called the Heartbleed Bug?
Bug is in the OpenSSL’s implementation of the TLS/DTLS (transport layer security protocols) heartbeat extension (RFC6520). When it is exploited it leads to the leak of memory contents from the server to the client and from the client to the server.
You can check if you’re vulnerable via the following link: http://filippo.io/Heartbleed/
Make sure that you only update your password if that site is no longer vulnerable.
But suggestions by Yahoo and the BBC that people should change their passwords at once – the typical reaction to a security breach – could make the problem worse if the web server hasn’t been updated to fix the flaw, says Mark Schloesser, a security researcher with Rapid7, based in Amsterdam, Netherlands.
Doing so “could even increase the chance of somebody getting the new password through the vulnerability,” Schloesser said, because logging in to an insecure server to change a password could reveal both the old and new passwords to an attacker.
Source: The Guardian