5.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
6.6 Medium
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
53.1%
Successful exploitation of these vulnerabilities could allow an attacker to obtain sensitive application information or modify the integrity of data being transmitted.
The following versions of Ypsomed mylife diabetes management platform, are affected:
The Ypsomed mylife Cloud discloses password hashes during the registration process.
CVE-2021-27491 has been assigned to this vulnerability. A CVSS v3 base score of 5.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N).
The Ypsomed mylife Cloud reflects the user password during the login process after redirecting the user from a HTTPS endpoint to a HTTP endpoint.
CVE-2021-27495 has been assigned to this vulnerability. A CVSS v3 base score of 6.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N).
The application layer encryption of the communication protocol between the Ypsomed mylife App and mylife Cloud uses non-random IVs, which allows man-in-the-middle attackers to tamper with messages.
CVE-2021-27499 has been assigned to this vulnerability. A CVSS v3 base score of 5.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N).
The application encrypts on the application layer of the communication protocol between the Ypsomed mylife App and mylife Cloud credentials based on hard-coded secrets, which allows man-in-the-middle attackers to tamper with messages.
CVE-2021-27503 has been assigned to this vulnerability. A CVSS v3 base score of 5.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N).
Julian Suleder, Linda Huischen, and Nils Emmerich of ERNW Research GmbH and Dr. Oliver Matula of Enno Rey Netzwerke GmbH (ERNW) reported these vulnerabilities to the Federal Office for Information Security (BSI, Germany), in the context of the BSI project ManiMed ā Manipulation of Medical Devices.
Ypsomed has taken action to update the affected mylife Cloud backend services to mitigate the vulnerabilities affecting the mylife Cloud in versions prior to 1.7.2. Ypsomed recommends users with the affected mobile application to update to the latest available application Version 1.7.5 or later.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
ā¢ Restrict system access to authorized personnel only and follow a least privilege approach.
ā¢ Apply defense-in-depth strategies.
ā¢ Disable unnecessary accounts and services.
ā¢ Where additional information is needed, refer to existing cybersecurity in medical device guidance issued by the FDA.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.cisa.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01BāTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-27491
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-27495
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-27499
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-27503
cwe.mitre.org/data/definitions/329.html
cwe.mitre.org/data/definitions/522.html
cwe.mitre.org/data/definitions/522.html
cwe.mitre.org/data/definitions/798.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Ypsomed%20mylife+https://www.cisa.gov/news-events/ics-medical-advisories/icsma-21-196-01
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics/recommended-practices
us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
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www.fda.gov/medical-devices/digital-health/cybersecurity
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
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mailto:?subject=Ypsomed%20mylife&body=www.cisa.gov/news-events/ics-medical-advisories/icsma-21-196-01
5.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
6.6 Medium
AI Score
Confidence
High
0.002 Low
EPSS
Percentile
53.1%