An issue was discovered in certain Apple products. iOS before 10.3 is affected. macOS before 10.12.4 is affected. tvOS before 10.2 is affected. The issue involves the "Keychain" component. It allows man-in-the-middle attackers to bypass an iCloud Keychain secret protection mechanism by leveraging lack of authentication for OTR packets.
http://www.securityfocus.com/bid/97134
http://www.securitytracker.com/id/1038138
https://support.apple.com/HT207601
Source: MITRE
Published: 2017-04-02
Updated: 2019-03-08
Type: CWE-200
Base Score: 4.3
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N
Impact Score: 2.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 5.9
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Impact Score: 3.6
Exploitability Score: 2.2
Severity: MEDIUM