Ghost is a vulnerability in glibc that attackers can use against only a handful of applications right now to remotely run executable code and gain control of a Linux server. The vulnerability is a heap-based buffer overflow and affects all Linux systems, according to experts, and has been present in the glibc code since 2000.
“An example of where this could be a big issue is within WordPress itself: it uses a function named wp_http_validate_url() to validate every pingback’s post URL,” wrote Sucuri research Marc-Alexandre Montpas in an advisory published Wednesday. “And it does so by using gethostbyname(). So an attacker could leverage this vector to insert a malicious URL that would trigger a buffer overflow bug, server-side, potentially allowing him to gain privileges on the server.”"
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