Daily Archives: October 26, 2017

Charles Leaver – You Have Heard Of The KRACK Vulnerability Here Is What You Do

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Written By Dr Al Hartmann And Presented By Charles Leaver

 

Enough media attention has actually been generated over the Wi-Fi WPA2-defeating Key Reinsertion Attack (KRACK), that we do not have to re-cover that ground. The original discoverer’s website is a good location to review the problems and link to the in-depth research paper. This might be the greatest attention paid to a fundamental communications security failure since the Heartbleed attack. In that earlier attack, a patched variation of the vulnerable OpenSSL code was released on the same day as the public disclosure. In this brand-new KRACK attack, similar accountable disclosure guidelines were followed, and patches were either currently released or quickly to follow. Both wireless end points and wireless network devices should be appropriately patched. Oh, and good luck getting that Chinese knockoff wireless security camera bought off eBay patched quickly.

Here we will simply make a couple of points:

Take inventory of your wireless devices and take action to ensure proper patching. (Ziften can carry out passive network stock, including wireless networks. For Ziften monitored endpoints, the available network interfaces in addition to applied patches are reported.) For business IT personnel, it is patch, patch, patch every day anyhow, so absolutely nothing new here. However any unmanaged wireless devices ought to be identified and verified.

Windows and iOS end points are less susceptible, while unpatched Linux and Android end points are extremely prone. A lot of Linux endpoints will be servers without wireless networking, so not as much direct exposure there. However Android is another story, particularly given the balkanized state of Android updating across device producers. Most likely your business’s biggest direct exposure will be IoT and Android devices, so do your risk analysis.

Prevent wireless access by means of unencrypted protocols such as HTTP. Adhere to HTTPS or other encrypted protocols or utilize a secure VPN, but know some default HTTPS sites allow jeopardized devices to coerce downgrade to HTTP. (Note that Ziften network monitoring reports IP addresses and ports used, so have a look at any wireless port 80 traffic on endpoints that are unpatched.).

Continue whatever wireless network hygiene practices you have been employing to identify and silence rogue access points, unapproved wireless devices, and so on. Grooming access point placement and transmission zones to lessen signal spillage outside your physical boundaries is likewise a smart practice, considering that KRACK aggressors should be present locally within the wireless network. Don’t give them advantaged placement chances inside or near your environment.

For a more wider conversation around the KRACK vulnerability, have a look at our current video on the topic: