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Tuesday, 24 November 2020 08:14

Israel cyber directorate warns of remotely exploitable Drupal flaw Featured

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Israel cyber directorate warns of remotely exploitable Drupal flaw Image by Pexels from Pixabay

A warning has been issued by the Israel National Cyber Directorate about a critical remote code execution flaw in the Drupal content management system.

"Thousands of Drupal servers have an easily exploitable critical vulnerability that can lead to remote code execution," the organisation said in a tweet on its official account.

"Keep your website safe from malware (especially Webshells) and Patch Now!"

The Drupal project issued an advisory about the vulnerability on 18 November. "Drupal core does not properly sanitise certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations," the advisory said.

To fix the issue, the project said upgrading was necessary, and issued the following advice:

"If you are using Drupal 9.0, update to Drupal 9.0.8; if you are using Drupal 8.9, update to Drupal 8.9.9; if you are using Drupal 8.8 or earlier, update to Drupal 8.8.11; if you are using Drupal 7, update to Drupal 7.74."

And it added: "Versions of Drupal 8 prior to 8.8.x are end-of-life and do not receive security coverage."

Users were advised to audit all previously updated files to check for malicious extensions.

"Look specifically for files that include more than one extension, like filename.php.txt or filename.html.gif, without an underscore (_) in the extension," the advisory said.

"Pay specific attention to the following file extensions, which should be considered dangerous even when followed by one or more additional extensions: phar, php, pl, py, cgi, asp, js, html, htm and phtml.

"This list is not exhaustive, so evaluate security concerns for other unmunged extensions on a case-by-case basis."


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Sam Varghese

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Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

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