GHOST Bug

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The GHOST bug is a buffer overflow security vulnerability in some distributions of Linux that can potentially enable attackers to execute arbitrary code on systems.

Specifically categorized as GHOST (gethostbyname) CVE-2015-0235, the GHOST bug flaw resides in the gethostbyname() and gethostbyname2() function calls in older versions of the GNU C Library (glibc) that is packaged with a variety of Linux distributions, including versions 5, 6 and 7 of Centos / RHEL / Fedora as well as Ubuntu 12.04.

In addition to older Linux distributions being vulnerable, applications and websites running on server hosts that use these older distributions may be susceptible to the GHOST bug as well, including Wordpress Web sites and various PHP applications.