It's a new month, and that means a new security update for Android. The November Android security patch is out, and this is more noteworthy than most with its fix for the high-profile key reinstallation attack (KRACK). It also puts some Band-Aids on the newly released Pixel 2 phones.
Google actually released three "November" security patches last night. First there's the normal "2017-11-01" security patch, which contains all the monthly patches developed on the regular schedule. OEMs get these fixes a full month in advance (so early October in this case), and Google lets the bugs sit around for a whole month, allowing OEMs to port the patch to their phones. A month later, Google discloses the bugs and (theoretically) does a simultaneous release with the Android OEMs and carriers.
Anything higher than the "20xx-xx-01" release exists because Google needed to target a particularly nasty bug in the middle of the month and fast track it through the release system. In this case, we have the "2017-11-05" and "2017-11-06" releases. While the 11/5 patch was mostly about fixing a critical Qualcomm bug, it's the 11/6 patch that will get the most attention, since it patches the KRACK Wi-Fi vulnerability.
In mid-October, a weakness in the WPA2 Protocol was found, which handles security for most Wi-Fi networks. Researchers found that a key reinstallation attack (KRACK) could disrupt the initial encryption handshake that takes place between an access point and a device, allowing an attacker to read information that was assumed to be encrypted. Any device that uses Wi-Fi is most likely vulnerable, but Linux and Android 6.0+ devices are particularly vulnerable, since they can be tricked into installing an all-zero encryption key.
In response Google patched a slew of bugs related to KRACK under the "2017-11-06" label. The versions patched cover Android 8.0 Oreo all the way back to Android 5.0.2 Lollipop, which Google still supports under the three-year security patch window. I'm not sure any OEM out there will actually patch an Android 5.0 device, but it's nice that Google cares.
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