Multiple vulnerabilities in Siemens SCALANCE X-300 Switches


1) Use of Hard-coded Cryptographic Key


Risk: High


CVSSv3: 7.9 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C] [PCI]


CVE-ID: CVE-2020-28395


CWE-ID: CWE-321 - Use of Hard-coded Cryptographic Key


Exploit availability: No


Description

The vulnerability allows a remote attacker to compromise the target system.


The vulnerability exists due to affected devices do not create a new unique private key after factory reset. A remote attacker can create a man-in-the-middle situation and decrypt previously captured traffic.


Mitigation

Install updates from vendor's website.


Vulnerable software versions

SCALANCE X-300: before 4.1.0


CPE
External links

https://cert-portal.siemens.com/productcert/pdf/ssa-274900.pdf


Q & A


Can this vulnerability be exploited remotely?


Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.


How the attacker can exploit this vulnerability?


The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.


Is there known malware, which exploits this vulnerability?


No. We are not aware of malware exploiting this vulnerability.



2) Heap-based buffer overflow


Risk: High


CVSSv3: < ..