Now-Fixed WiFi Vulnerability Left Apple Devices Open to Attack

A vulnerability in WiFi chips made by Cypress Semiconductor and Broadcom left billions of devices susceptible to an attack that allowed nearby attackers to decrypt sensitive data sent over the air.

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The security flaw was detailed at the RSA security conference today (via Ars Technica), and for Apple users, the issue was addressed in the iOS 13.2 and macOS 10.15.1 updates that were released back in late October.

Dubbed Kr00k, the WiFi chip flaw caused vulnerable devices to use an all-zero encryption key to encrypt part of a user's communications. When applied successfully, the attack let hackers decrypt some wireless network packets sent by a vulnerable device. As described by Ars Technica:

Kr00k exploits a weakness that occurs when wireless devices disassociate from a wireless access point. If either the end-user device or the access point is vulnerable, it will put any unsent data frames into a transmit buffer and then send them over the air. Rather than encrypt this data with the session key negotiated earlier and used during the normal connection, vulnerable devices use a key consisting of all zeros, a move that makes decryption trivial.

Chips from Broadcom and Cypress are used in many modern WiFi devices like smartphones, laptops, Internet of Things products, WiFi access points, and routers.

Our tests confirmed that prior to patching, some client devices by Amazon (Echo, Kindle), Apple (iPhone, iPad, MacBook), Google (Nexus), Samsung (Galaxy), Raspberry (Pi 3), Xiaomi (RedMi), as well as some access points by Asus and Huawei, were vulnerable to KrØØk. This totaled to over a billion Wi-Fi-capable devices and access points, at a conservative estimate. Further, many other vendors whose products we did not test also use the affected chipsets in their devices.

According to ESET Research, which published details on the vulnerability, it was disclosed to Broadcom and Cypress along with potentially affected parties. At this time, patches for devices from most major manufacturers have been released.

ESET Research recommends making sure all of the latest updates have been applied to WiFi capable devices to patch the vulnerability.

Top Rated Comments

Cosmosent Avatar
10 months ago
Anybody know if it's fixed in Mojave 10.14.6 ?
Score: 5 Votes (Like | Disagree)
now i see it Avatar
10 months ago
but we were assured that iOS devices were secure...
Score: 5 Votes (Like | Disagree)
cmaier Avatar
10 months ago


They are as secure as anything else. But Apple designs some of their chips, they don't make them. Contractors do. So the vulnerabilities can still be introduced into the supply chain through the same vector; chip providers... just like the vulnerabilities can be introduced by Apple themselves... or the chip makers suppliers... or...

Most of this stuff is scarier in theory than in practice.

It would be very unlikely for a vulnerability that does not exist in the design to exist in the manufactured silicon. When we design chips, and have them made, we test them extremely thoroughly to make sure they behave identically to the RTL and simulated netlist.

And since the manufacturer does not have a simulate-able netlist, it would be very difficult to introduce intentional flaws while still maintaining full functionality so as to fool this testing.
Score: 4 Votes (Like | Disagree)
1345873 Avatar
10 months ago


Anybody know if it's fixed in Mojave 10.14.6 ?

it's not there, no problem with Mojave and WiFi..

why the angry faces? Apple hasn’t confirmed it, so there’s no problem..
Score: 4 Votes (Like | Disagree)
allpar Avatar
10 months ago


this is why you keep your devices updated because of security risks - most people forget that

Yeah, well, if they make new versions compatible with old software, I can do that, but I'm not spending ten grand to move to Catalina.
Score: 3 Votes (Like | Disagree)
iapplelove Avatar
10 months ago


No we were assured that “what happens on the iPhone stays in the iPhone” and “it just works”.

I never understood the “ what happens on my iPhone stays on my iPhone” campaign.
Doesnt make much sense to me when I rely on iCloud so much.
Score: 3 Votes (Like | Disagree)

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