CVE-2021-23842 Use of Hard-coded Cryptographic Key
An attacker on the local network can extract a hardcoded key to decrypt traffic and modify device configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-23842?
CVE-2021-23842 is a medium-severity vulnerability in Bosch AMC2, published on 19 Jan 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Communication to the AMC2 uses a state-of-the-art cryptographic algorithm for symmetric encryption called Blowfish. An attacker could retrieve the key from the firmware to decrypt network traffic between the AMC2 and the host system. Thus, an attacker can exploit this vulnerability to decrypt and modify network traffic, decrypt and further investigate the device\'s firmware file, and change the device configuration. The attacker needs to have access to the local network, typically even the same subnet.
Which versions are affected by CVE-2021-23842?
It affects 4 products.
Products include Bosch Access Management System, Bosch Access Professional Edition, Bosch Amc2 Firmware, Bosch Building Integration System.
How do I fix CVE-2021-23842?
No fix has been published for CVE-2021-23842 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-23842 being exploited?
There is no known exploitation of CVE-2021-23842 in the wild and no public exploit code.
Other vulnerabilities in Bosch AMC2
Sources
Also known as GHSA-j6hr-vmm6-m6c2.