A vulnerability found in the Linux kernel, specifically a flaw with the pseudo tty (pty) device, allows an unprivileged user to cause a denial of service (system crash) or potentially gain administrator privileges. A small number of CentOS and Ubuntu versions are vulnerable, thus we want to highlight the following information:
OpenSSL is a common cryptographic library which provides encryption, specifically SSL/TLS, for popular applications such as Apache (web), MySQL (database), e-mail, virtual private networks (VPNs), and more.
The Heartbleed Bug is a severe vulnerability in OpenSSL, known formally as “TLS heartbeat read overrun (CVE-2014-0160)“. As of April 07, 2014, a security advisory was released by OpenSSL.org, along with versions of OpenSSL that fix this vulnerability.
In short, the risks are many. In most circumstances, this flaw allows an attacker to read the memory of servers running vulnerable versions of OpenSSL. This would allow attackers to impersonate users and services, and provide a means for data theft. For example, the exposed memory could include sensitive information such as private keys. If private keys are leaked, then it is possible that SSL certificates are compromised, and in that case should definitely be reissued.
- Update and reboot your server immediately.
- After the server has been rebooted, change all passwords associated with the server.
- Consider getting your SSL certificates reissued.
- These instructions are intended for patching OpenSSL on CentOS 6 against the “TLS heartbeat read overrun (CVE-2014-0160)” vulnerability.
- I’ll be working from a Liquid Web Core Managed CentOS 6.5 server, and I’ll be logged in as root.