Use of insufficiently random values in Siemens Linux Based Products



Published: 2021-05-13 | Updated: 2021-08-15
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-25705
CWE-ID CWE-330
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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SIMATIC NET CP 1545-1
Hardware solutions / Firmware

SIMATIC NET CP 1543SP-1
Hardware solutions / Firmware

SIMATIC NET CP 1543-1
Hardware solutions / Firmware

SIMATIC NET CP 1542SP-1 IRC
Hardware solutions / Firmware

SIMATIC NET CP 1243-8 IRC
Hardware solutions / Firmware

SIMATIC NET CP 1243-7
Hardware solutions / Firmware

SIMATIC NET CP 1243-7 LTE US
Hardware solutions / Firmware

SIMATIC NET CP 1243-7 LTE EU
Hardware solutions / Firmware

SCALANCE W1750D
Hardware solutions / Firmware

SCALANCE M-800 / S615
Hardware solutions / Firmware

SIMATIC NET CP 1243-1
Hardware solutions / Firmware

TIM 1531 IRC
Hardware solutions / Firmware

RUGGEDCOM RM1224
Hardware solutions / Routers & switches, VoIP, GSM, etc

SCALANCE SC-600
Hardware solutions / Routers & switches, VoIP, GSM, etc

SIMATIC Cloud Connect 7
Client/Desktop applications / Other client software

SIMATIC MV500
Hardware solutions / Security hardware applicances

SINEMA Remote Connect Server
Server applications / SCADA systems

Vendor Siemens

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Use of insufficiently random values

EUVDB-ID: #VU49150

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25705

CWE-ID: CWE-330 - Use of Insufficiently Random Values

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

A flaw in the way reply ICMP packets are limited in the Linux kernel functionality was found that allows to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypassing source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC NET CP 1545-1: All versions

SIMATIC NET CP 1543SP-1 : 2.0

SIMATIC NET CP 1543-1: 2.2

SIMATIC NET CP 1542SP-1 IRC: 2.0

SIMATIC NET CP 1243-8 IRC: 3.1.39

SIMATIC NET CP 1243-7: 3.1.39

SIMATIC NET CP 1243-7 LTE US: 3.1.39

SIMATIC NET CP 1243-7 LTE EU: 3.1.39

SCALANCE W1750D: 8.3.0.1, 8.6.0, 8.7.0

SCALANCE M-800 / S615: 5.0, 6.4

RUGGEDCOM RM1224: 5.0, 6.4

SIMATIC NET CP 1243-1: 3.1.39

SIMATIC Cloud Connect 7: All versions

SIMATIC MV500: All versions

TIM 1531 IRC: All versions

SINEMA Remote Connect Server: before 3.0 SP1

SCALANCE SC-600: before 2.1.3

CPE2.3 External links

http://ics-cert.us-cert.gov/advisories/icsa-21-131-03
http://cert-portal.siemens.com/productcert/pdf/ssa-324955.pdf

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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



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