CVE-2021-34600

Public Exploit
Telenot complex: Insecure AES Key Generation

Description

Telenot CompasX versions prior to 32.0 use a weak seed for random number generation leading to predictable AES keys used in the NFC tags used for local authorization of users. This may lead to total loss of trustworthiness of the installation.

Remediation

Solution:

  • Update to CompasX versions >= 32.0

Workaround:

  • It is strongly recommended to raise the security level during the time window until the AES keys can be changed to securely generated ones. The complex alarm systems supports alternative authentication factors that can be combined with the Desfire NFC tag authentication. An example for such an additional factor is a requirement for a valid PIN entry on the complex alarm system in addition to a successful Desfire authentication to disarm the alarm.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.12%
Third-Party Advisory x41-dsec.de
Affected: Telenot Electronic GmbH CompasX
Published at:
Updated at:

References

Link Tags
https://www.x41-dsec.de/lab/advisories/x41-2021-003-telenot-complex-insecure-keygen/ third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-34600?
CVE-2021-34600 has been scored as a medium severity vulnerability.
How to fix CVE-2021-34600?
To fix CVE-2021-34600: Update to CompasX versions >= 32.0
Is CVE-2021-34600 being actively exploited in the wild?
It is possible that CVE-2021-34600 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-34600?
CVE-2021-34600 affects Telenot Electronic GmbH CompasX.
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