#VU54921 Not Using an Unpredictable IV with CBC Mode in Ypsomed mylife Cloud and Ypsomed mylife App - CVE-2021-27499
Published: July 16, 2021
Vulnerability identifier: #VU54921
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-27499
CWE-ID: CWE-329
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Ypsomed mylife Cloud
Ypsomed mylife App
Ypsomed mylife Cloud
Ypsomed mylife App
Software vendor:
Ypsomed
Ypsomed
Description
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the application layer encryption of the communication protocol between the Ypsomed mylife App and mylife Cloud uses non-random IVs. A remote attacker can perform a man-in-the-middle attack to tamper with messages.
Remediation
Install updates from vendor's website.