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IoT devices at risk from Amnesia:33

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A new series of vulnerabilities dubbed Amnesia:33 puts millions of IoT devices at risk of being compromised.

Security researchers from Forescout disclosed the 33 vulnerabilities today. The flaws are found in four open-source TCP/IP libraries used in the firmware of products from over 150 vendors.

According to the researchers’ estimates, millions of consumer and enterprise IoT devices are at risk from Amnesia:33 vulnerabilities.

The affected libraries are uIP, FNET, picoTCP, and Nut/Net. Manufacturers have used these libraries for decades to add TCP/IP support to their products.

Here are the number of vulnerabilities discovered in each library:

  • uIP – 13
  • picoTCP – 10
  • FNET – 5
  • Nut/Nut – 5

uIP, the most vulnerable library, was also found to be used in the highest number of vendors.

Forescout also analysed the following libraries but did not find any vulnerabilities: lwIP, CycloneTCP, and uC/TCP-IP. 

Due to the prevalence of these libraries, just about every type of connected hardware is impacted by Amnesia:33—from SoCs to smart plugs, from IP cameras to servers.

Unlike the previously disclosed Ripple20 vulnerabilities, Amnesia:33 primarily affects the DNS, TCP, and IPv4/IPv6 sub-stacks.

Ripple20 and Amnesia:33 vulnerabilities both predominately consist of Out-of-Bounds Read, followed by Integer Overflow.

IoT devices (46%) represent the highest number of affected device types, according to Forescout’s research. This is followed by OT/BAS and OT/ICS at 19 percent, and then IT at 16 percent.

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