Home/CVE/A door-unlocking issue was discovered on Software House iStar Ultra devices through 6.5.2.20569 when used in conjunction
CVE

CVE-2017-17704

A door-unlocking issue was discovered on Software House iStar Ultra devices through 6.5.2.20569 when used in conjunction

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.

HIGH · CVSS 7.4 EPSS 0.00156
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-330Use of Insufficiently Random Values
▤

Affected Products & Versions

1
swhouse istar ultra firmware<= 6.5.2.20569
▣

Scoring & Timeline

7.4
HIGH · CVSS v3.0 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD31 Dec 2017 · 02:29 AM
CVSS VectorCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://systemoverlord.com/2017/12/18/cve-2017-17704-broken-cryptography-in-istar-ultra-ip-acm-by-software-house.htmlThird Party Advisory
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