Use of insufficiently random values in Siemens Linux Based Products

1) Use of insufficiently random values

EUVDB-ID: #VU49150

Risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

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 - 8.7.0

SCALANCE M-800 / S615: - - 6.4

RUGGEDCOM RM1224: - - 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

• cpe:2.3:h:siemens:simatic_net_cp_1545-1:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1543sp-1:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1543sp-1:2.0:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1543-1:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1543-1:2.2:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1542sp-1_irc:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1542sp-1_irc:2.0:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1243-8_irc:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1243-8_irc:3.1.39:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1243-7:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1243-7_lte_us:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1243-7_lte_eu:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:scalance_w1750d:8.3.0.1:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:scalance_m-800_s615:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:ruggedcom_rm1224:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_net_cp_1243-1:*:*:*:*:*:*:*:*
• cpe:2.3:a:siemens:simatic_cloud_connect_7:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_mv500:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:tim_1531_irc:*:*:*:*:*:*:*:*
• cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:scalance_sc-600:*:*:*:*:*:*:*:*

External links

https://ics-cert.us-cert.gov/advisories/icsa-21-131-03
https://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.