A critical vulnerability in operating system Linux has been discovered, which allows attackers to remotely take control of an entire system without having any prior knowledge of system credentials.
The vulnerability, discovered by Qualys, a provider of cloud security and compliance solution, is in the Linux GNU C Library (glibc) and is known as GHOST (CVE-2015-0235), because it can be triggered by the gethostbyname functions. It impacts many systems built on Linux starting with glibc-2.2 released on November 10, 2000.
Qualys researchers also identified a number of factors that mitigate the impact of this bug including a fix released on May 21, 2013 between the releases of glibc-2.17 and glibc-2.18. Unfortunately, this fix was not classified as a security advisory and, as a result, most stable and long-term-support distributions were left exposed including – Debian 7 (wheezy), Red Hat Enterprise Linux 6 & 7, CentOS 6 & 7 and Ubuntu 12.04.
remediation progress of this serious vulnerability.
Wolfgang Kandek, chief technology officer for Qualys, said: “GHOST poses a remote code execution risk that makes it incredibly easy for an attacker to exploit a machine. For example, an attacker could send a simple email on a Linux-based system and automatically get complete access to that machine.”
“Given the sheer number of systems based on glibc, we believe this is a high severity vulnerability and should be addressed immediately. The best course of action to mitigate the risk is to apply a patch from your Linux vendor.”
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