New Apache Struts flaw lets hackers take over web servers.

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It has been reported that a security researcher has disclosed a critical remote code execution vulnerability in the popular Apache Struts web application framework that could allow remote attackers to run malicious code on the affected servers.

Apache Struts is an open source framework for developing web applications in the Java programming language and is widely used by enterprises globally, including by 65 percent of the Fortune 100 companies, like Vodafone, Lockheed Martin, Virgin Atlantic, and the IRS. The vulnerability (CVE-2018-11776) resides in the core of Apache Struts and originates because of insufficient validation of user-provided untrusted inputs in the core of the Struts framework under certain configurations.

Tim Mackey, technical evangelist at Black Duck by Synopsys commented, "In 2016 and 2017, the Apache Struts community disclosed a series of remote code execution vulnerabilities. These vulnerabilities all related to the improper handling of unvalidated data. In identifying CVE-2018-11776, the researcher looked at prior remote code execution vulnerabilities within Struts to determine if there was a coding pattern which lead to them. As background, developers commonly use libraries of code, or development paradigms which have proven efficient, when creating new applications or features. This attribute is a positive when the library or paradigm is of high quality, but when a security defect is uncovered this same attribute often leads to a pattern of security issues.

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