Authentication bypass in Siemens SCALANCE X Switches



Published: 2020-01-15
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-13933
CWE-ID CWE-306
Exploitation vector Network
Public exploit N/A
Vulnerable software
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SCALANCE X-200RNA
Hardware solutions / Routers & switches, VoIP, GSM, etc

SCALANCE X-300
Hardware solutions / Routers & switches, VoIP, GSM, etc

SCALANCE X-408
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor Siemens

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Missing Authentication for Critical Function

EUVDB-ID: #VU24311

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-13933

CWE-ID: CWE-306 - Missing Authentication for Critical Function

Exploit availability: No

Description

The vulnerability allows a remote attacker to violate access-control rules.

The vulnerability exists due to the affected system contains an authentication bypass vulnerability. A remote attacker can send a specially crafted GET request to specific uniform resource locator on the web configuration interface of the device and obtain sensitive information or change the device configuration.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SCALANCE X-200RNA: All versions

SCALANCE X-300: before 4.1.3

SCALANCE X-408: before 4.1.3


CPE2.3 External links

http://ics-cert.us-cert.gov/advisories/icsa-20-014-03
http://cert-portal.siemens.com/productcert/pdf/ssa-443566.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.



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