Vulnerability identifier: #VU78271

Vulnerability risk: Critical

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2023-3595

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
1756-EN2T Series A
Client/Desktop applications / Software for system administration
1756-EN2T Series B
Client/Desktop applications / Software for system administration
1756-EN2T Series C
Client/Desktop applications / Software for system administration
1756-EN2T Series D
Client/Desktop applications / Software for system administration
1756-EN2TR Series A
Client/Desktop applications / Software for system administration
1756-EN2TR Series B
Client/Desktop applications / Software for system administration
1756-EN2TR Series C
Client/Desktop applications / Software for system administration
1756-EN2F Series A
Client/Desktop applications / Software for system administration
1756-EN2F Series C
Client/Desktop applications / Software for system administration
1756-EN3TR Series A
Client/Desktop applications / Software for system administration
1756-EN3TR Series B
Client/Desktop applications / Software for system administration
1756-EN2TK Series A
Server applications / SCADA systems
1756-EN2TK Series B
Server applications / SCADA systems
1756-EN2TK Series C
Server applications / SCADA systems
1756-EN2TK Series D
Server applications / SCADA systems
1756-EN2TXT Series A
Server applications / SCADA systems
1756-EN2TXT Series B
Server applications / SCADA systems
1756-EN2TXT Series C
Server applications / SCADA systems
1756-EN2TXT Series D
Server applications / SCADA systems
1756-EN2TP Series A
Server applications / SCADA systems
1756-EN2TPK Series A
Server applications / SCADA systems
1756-EN2TPXT Series A
Server applications / SCADA systems
1756-EN2TRK Series A
Server applications / SCADA systems
1756-EN2TRK Series B
Server applications / SCADA systems
1756-EN2TRK Series C
Server applications / SCADA systems
1756-EN2TRXT Series A
Server applications / SCADA systems
1756-EN2TRXT Series C
Server applications / SCADA systems
1756-EN2TRK Series B
Server applications / SCADA systems
1756-EN2FK Series A
Server applications / SCADA systems
1756-EN2FK Series C
Server applications / SCADA systems
1756-EN3TRK Series A
Server applications / SCADA systems
1756-EN3TRK Series B
Server applications / SCADA systems

Vendor:

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing CIP messages. A remote attacker can send specially crafted CIP messages to ports 44818/TCP or 2222/UDP, trigger an out-of-bounds write and execute arbitrary code.

Note, the vulnerability is most likely being exploited in the wild.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1140010
http://www.bleepingcomputer.com/news/security/rockwell-warns-of-new-apt-rce-exploit-targeting-critical-infrastructure/
http://www.cisa.gov/news-events/ics-advisories/icsa-23-193-01

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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?

Yes. This vulnerability is being exploited in the wild.