![]() ![]() Cisco encourages customers to verify susceptibility of this attack with endpoint vendors. Cisco access points are not susceptible to this attack. ![]() An attacker can impersonate an AP and force the stations to choose a weaker, or a computationally expensive, group (thus attempting to exhaust the AP resources). If the AP does not support that group, it can return a decline message, forcing the initiating station to choose another group (until a group algorithm supported by both sides is found). SAE group key negotiation attack: when sending the commit frame, the initiating side (typically the client) mentions the security group algorithm that it wants to use.Cisco supports both “WPA3-Personal Only” and “WPA2+WPA3 Personal” mode (which is the mixed mode.) Cisco recommends configuring WPA-3 only WLANs and avoid configuring WLANs in mixed mode. An attacker could spoof the AP MAC address and force clients to a WPA2 mode (then use known attacks against WPA2-PSK to recover the PSK). Backward compatibility attack: To accomodate older clients that only support WPA2-Personal and aid in the transition from WPA2-Personal to WPA3-Personal, a WPA3-Personal transition mode was created (thus an SSID allowing both WPA3-PSK and WPA2-PSK).The effect of such attack on clients in a Cisco network may be a slower handshake completion. Cisco APs incorporate automatic detection and blacklisting of misbehaving clients as well as anti-exhaustion mechanisms. An attacker could use this fact to generate a large number of commit frames from fake MAC addresses and overload the AP. Processing that frame and generating an answer is computationally expensive on the AP. Denial of Service attacks: with SAE, the initiating station (typically the client) starts by sending a commit frame, which content is built from the PSK and random numbers.When using SAE (in WPA3-personal), the researcher has found that several vulnerabilities were possible: Please note that WPA3-Enterprise mode (with 802.1X/EAP) is not affected by the vulneraibioty disclosure. SAE is defined in the 802.11 standard, and WPA3 uses SAE in the WPA3-Personal (PSK) mode. Simultaneous Authentication of Equals (SAE) is a password authenticated key exchange intended to provide resistance to offline dictionary attacks which is one of the major challenges in WPA-2 Personal (PSK). This document provides a summary of the issues raised in the vulnerability disclosure. WPA3 clients may need to be updated and Cisco recommends finding the latest information from vendors’ websites.Īlthough no Cisco products are affected, Cisco understands that customers are interested in understanding the vulnerabilities in order to assess WPA3 clients’ vulnerabilities. The Cisco AireOS and IOS-XE releases that support SAE for WPA3-Personal will also include protection mechanisms against these vulnerabilities. Cisco Access points are not affected by any of the vulnerabilities described. This paper describes how the Simultaneous Authentication of Equals (SAE) handshake, defined in IEEE-802.11-2016 and implemented as part of the Wi-Fi Alliance’s Wi-Fi Protected Access 3 (WPA3) security suite, has recently been identified to have multiple vulnerabilities.Īn attacker could exploit these vulnerabilities to attempt the offline recovery of the password used to secure a Wi-Fi network or perform a denial of service attack against vulnerable access points. On April 10, 2019, a research paper entitled Dragonblood: Analysing WPA3’s Dragonfly Handshakewas made publicly available. ![]()
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