Not Using an Unpredictable IV with CBC Mode in Ypsomed mylife Cloud and Ypsomed mylife App - CVE-2021-27499

 

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
CSH Severity: Medium
CVSS v4: 5.1 [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]
CVE-ID: CVE-2021-27499
CWE-ID: CWE-329
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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. 


Affected software

Ypsomed mylife Cloud
Ypsomed mylife App

How to mitigate CVE-2021-27499

Install updates from vendor's website.

Ypsomed mylife Cloud - update to 1.7.2
Ypsomed mylife App - update to 1.7.5

External References

Related Security Bulletins