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CVE-2017-17704

Status Candidate

Overview

A door-unlocking issue was discovered on Software House iStar Ultra devices through 6.5.2.20569 when used in conjunction with the IP-ACM Ethernet Door Module. The communications between the IP-ACM and the iStar Ultra is encrypted using a fixed AES key and IV. Each message is encrypted in CBC mode and restarts with the fixed IV, leading to replay attacks of entire messages. There is no authentication of messages beyond the use of the fixed AES key, so message forgery is also possible.

Related Files

iStar Ultra / IP-ACM Boards Fixed AES Key
Posted Dec 20, 2017
Authored by David Tomaschik

Vulnerabilities were identified in the iStar Ultra and IP-ACM boards offered by Software House. The communications between the IP-ACM and the iStar Ultra is encrypted using a fixed AES key and IV. Each message is encrypted in CBC mode and restarts with the fixed IV, leading to replay attacks of entire messages. There is no authentication of messages beyond the use of the fixed AES key, so message forgery is also possible.

tags | advisory, vulnerability, bypass
advisories | CVE-2017-17704
SHA-256 | 204786b1402fdbec34ba89ae4fe9ceed678dd3d6096ef0880cd0a2f1ff6cb00d
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