CVE-2017-17704 – iStar Ultra / IP-ACM Boards Fixed AES Key

https://notcve.org/view.php?id=CVE-2017-17704

20 Dec 2017 — 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. Se ha descubierto un pr... • https://systemoverlord.com/2017/12/18/cve-2017-17704-broken-cryptography-in-istar-ultra-ip-acm-by-software-house.html • CWE-330: Use of Insufficiently Random Values •