Tech Industry Quietly Patches FragAttacks Wi-Fi Flaws That Leak Data, Weaken Security

An anonymous reader quotes a report from The Register: A dozen Wi-Fi design and implementation flaws make it possible for miscreants to steal transmitted data and bypass firewalls to attack devices on home networks, according to security researcher Mathy Vanhoef. On Tuesday, Vanhoef, a postdoctoral researcher in computer security at New York University Abu Dhabi, released a paper titled, 'Fragment and Forge: Breaking Wi-Fi Through Frame Aggregation and Fragmentation' [PDF]. Scheduled to be presented later this year at the Usenix Security conference, the paper describes a set of wireless networking vulnerabilities, including three Wi-Fi design flaws and nine implementation flaws. Vanhoef, who in 2017 along with co-author Frank Piessens identified key reinstallation attacks (KRACKs) on the WPA2 protocol (used to secure Wi-Fi communication), has dubbed his latest research project FragAttacks, which stands for fragmentation and aggregation attacks.

The dozen vulnerabilities affect all Wi-Fi security protocols since the wireless networking technology debuted in 1997, from WEP up through WPA3. In total, 75 devices -- network card and operating system combinations (Windows, Linux, Android, macOS, and iOS) -- were tested and all were affected by one or more of the attacks. NetBSD and OpenBSD were not affected because they don't support the reception of A-MSDUs (aggregate MAC service data units).

Patches for many affected devices and software have already been deployed, thanks to a nine-month-long coordinated responsible disclosure overseen by the Wi-Fi Alliance and the Industry Consortium for Advancement of Security on the Internet (ICASI). Linux patches have been applied and the kernel mailing list note mentions that Intel has addressed the flaws in a recent firmware update without mentioning it. Microsoft released its patches on March 9, 2021 when disclosure was delayed tho Redmond had already committed to publication. Vanhoef advises checking with the vendor(s) of Wi-Fi devices about whether the FragAttacks have been addressed. '[F]or some devices the impact is minor, while for others it's disastrous,' he said.

Read more of this story at Slashdot.