2024-11-25
Nearest Neighbor Attack (TL;DR: Implement MFA on Your Wi-Fi Network)
Researchers from Volexity found that a Russian APT gained access to a targeted network by finding nearby vulnerable networks and “daisy-chaining” access to breach the targeted organization’s Wi-Fi network. The attackers used credential stuffing attacks to find passwords to the targeted organization's web service platform accounts, but MFA prevented them from accessing those accounts. Once they gained access through the nearby organizations’ Wi-Fi however, the attackers found that the purloined credentials worked on the neighboring Wi-Fi network because it had no MFA. Beyond monitoring and detection tools, mitigation suggestions from Volexity include “creat[ing] separate networking environments for Wi-Fi and Ethernet-wired networks, particularly where Ethernet-based networks allow for access to sensitive resources [and] … hardening access requirements for Wi-Fi networks, such as applying MFA requirements for authentication or certificate-based solutions.” Volexity’s Steven Adair presented the company’s findings at the Cyberwarcon security conference last week.
Editor's Note
So much to consider here. I continue to be surprised when VPN and Wi-Fi networks not only just require username/(AD) password, but also that these lightly authenticated connections are now trusted. At a minimum, implement OTP for these connections. With all the work we've done to expose services for access without respect to the network, maybe circle back and look at them from a zero-trust perspective; both the user and the device need to be authenticated before connections to services are granted, regardless of the originating network. Make sure you have Wi-Fi monitoring and security dialed in, not only for unexpected behavior, but also for rogue device and network detection and response.
Lee Neely
I have heard people speculating about attacks like this. This is the first time I have seen it documented. The closest attack like this was an attack against a financial institution where an adversary landed a drone on the building that was used as a Wi-Fi relay. This attack should renew interest in Wi-Fi security.
Johannes Ullrich
Read more in
Volexity: The Nearest Neighbor Attack: How A Russian APT Weaponized Nearby Wi-Fi Networks for Covert Access
Wired: Russian Spies Jumped From One Network to Another Via Wi-Fi in an Unprecedented Hack
Ars Technica: Spies hack Wi-Fi networks in far-off land to launch attack on target next door
Dark Reading: Fancy Bear 'Nearest Neighbor' Attack Uses Nearby Wi-Fi Network
Bleeping Computer: Hackers breach US firm over Wi-Fi from Russia in 'Nearest Neighbor Attack'
Security Week: Russian Cyberspies Hacked Building Across Street From Target for Wi-Fi Attack