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Google Confirms Serious Chrome Security Problem – Here’s How To Fix It

The problem explained

Although information regarding CVE-2019-5786 remains scarce currently, Satnam Narang, a senior research engineer at Tenable, says it is a “Use-After-Free (UAF) vulnerability in FileReader, an application programming interface (API) included in browsers to allow web applications to read the contents of files stored on a user’s computer.” Some further digging by Catalin Cimpanu over at ZDNet suggests that there are malicious PDF files in the wild that are being used to exploit this vulnerability. “The PDF documents would contact a remote domain with information on the users’ device –such as IP address, OS version, Chrome version, and the path of the PDF file on the user’s computer,” Cimpanu says. These could just be used for tracking purposes, but there is also the potential for more malicious behavior. The ‘use-after-free’ vulnerability is a memory corruption flaw that carries the risk of escalated privileges on a machine where a threat actor has modified data in memory through exploiting it. That’s why Google has issued the urgent update warning, as the potential is there for exploits to be crafted that could enable an attacker to remotely run arbitrary code (a remote code execution attack) whilst escaping the browser’s built-in sandbox protection.

What to do next

Luckily this is an easy problem to fix, just make sure you do it as soon as you’ve finished reading this! First, head over to the drop-down menu in Chrome (you’ll find it at the far right of the toolbar – click on the three stacked dots) and select Help|About Google Chrome. You could also type chrome://settings/help in the address bar if you prefer, which takes you to the same dialog box. This will tell you if you have the current version running or if there is an update available. To be safe from this zero-day exploit, make sure that it says you are running version 72.0.3626.121 (Official Build). If not, then Chrome should go and fetch the latest version and update your browser for you automatically.

Travis Biehn, technical strategist and research lead at Synopsys, said “Google Chrome is some of the most robustly engineered C and C++ code on the planet, the security teams working on Chrome are world-class. Despite Google’s security program, and despite their active collaboration with leading security researchers through generous bug bounty programs, it still suffers from memory corruption attacks related to the use of C and C++. Luckily for the public, Chrome ships with an effective mechanism for update and patching – one that can get a critical fix out to end users in real time.”

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These are Google’ instructions:

Get a Chrome update when available

Normally updates happen in the background when you close and reopen your computer’s browser. But if you haven’t closed your browser in a while, you might see a pending update:

  1. On your computer, open Chrome.
  2. At the top right, look at More More.
  3. If an update is pending, the icon will be colored:
    • Green: An update’s been available for 2 days.
    • Orange: An update’s been available for 4 days.
    • Red: An update’s been available for 7 days.

To update Google Chrome:

  1. On your computer, open Chrome.
  2. At the top right, click More More.
  3. Click Update Google Chrome. If you don’t see this button, you’re on the latest version.
  4. Click Relaunch.

The browser saves your opened tabs and windows and reopens them automatically when it restarts. If you’d prefer not to restart right away, click Not now. The next time you restart your browser, the update will be applied.

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