ABB Working on Fix for TropOS

Tuesday, November 14, 2017 @ 08:11 PM gHale


ABB is working on a fix for the key reinstallation attacks (KRACK) that potentially affects all TropOS broadband mesh routers and bridges operating on Mesh OS release 8.5.2 or prior, according to a report with ICS-CERT.

Successful exploitation of these vulnerabilities could allow an attacker to decrypt, replay, and forge some frames on a WPA2 encrypted network.

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ABB released an advisory (1KHW02890) on the vulnerability, discovered by Mathy Vanhoef of the Katholieke Universiteit Leuven in Belgium.

The TropOS mesh wireless interfaces are not vulnerable. Wired client interfaces (Ethernet, Serial) are not vulnerable. An attacker must be in physical proximity of the Wi-Fi access point and connected client to be successful. If the communication across the Wi-Fi link is encrypted at Layer 3 (e.g., SSH, SSL, HTTPS, or SNMPv3 encrypted), privacy is maintained during an otherwise successful attack. If possible, encrypt communication across the Wi-Fi link at Layer 3 using SSH, SSL, HTTPS, or SNMPv3. There is no complete workaround which allows protected Wi-Fi access to the TropOS Mesh.

ABB users with a current Complete Software Care or Complete Software + Hardware Care subscription should contact ABB Wireless support on phone at (408) 331 6800, ext. 4, or email.

These vulnerabilities have been publicly disclosed. These vulnerabilities are exploitable from adjacent networks. High skill level is needed to exploit.

An industry-wide vulnerability exists in the WPA2 key management algorithm devices that use IEEE 802.11w, including the TropOS broadband mesh routers listed above. The vulnerability may allow an attacker to decrypt, replay, and forge some frames on a WPA2 encrypted network.

The following CVEs have been assigned to this group of vulnerabilities:
• CVE-2017-13077: reinstallation of the pairwise key in the four-way handshake
• CVE-2017-13078: reinstallation of the group key in the four-way handshake
• CVE-2017-13079: reinstallation of the integrity group key in the four-way handshake
• CVE-2017-13080: reinstallation of the group key in the group key handshake
• CVE-2017-13081: reinstallation of the integrity group key in the group key handshake
• CVE-2017-13082: accepting a retransmitted fast BSS transition reassociation request and reinstalling the pairwise key while processing it
• CVE-2017-13084: reinstallation of the STK key in the PeerKey handshake
• CVE-2017-13086: reinstallation of the tunneled direct-link setup (TDLS) PeerKey (TPK) key in the TDLS handshake
• CVE-2017-13087: reinstallation of the group key (GTK) when processing a wireless network management (WNM) sleep mode response frame
• CVE-2017-13088: reinstallation of the integrity group key (IGTK) when processing a wireless network management (WNM) sleep mode response frame

A CVSS v3 base score of 6.8 has been calculated.

The products see action in the critical manufacturing and energy sectors. They also see use on a global basis.



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