#VU78271 Out-of-bounds write in Rockwell Automation products - CVE-2023-3595

Vulnerability identifier: #VU78271

Vulnerability risk: Critical

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

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-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: Rockwell Automation

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

1756-EN2T Series A: before 5.009

1756-EN2T Series B: before 5.009

1756-EN2T Series C: before 5.009

1756-EN2T Series D: before 11.004

1756-EN2TK Series A: before 5.009

1756-EN2TK Series B: before 5.009

1756-EN2TK Series C: before 5.009

1756-EN2TK Series D: before 11.004

1756-EN2TXT Series A: before 5.009

1756-EN2TXT Series B: before 5.009

1756-EN2TXT Series C: before 5.009

1756-EN2TXT Series D: before 11.004

1756-EN2TP Series A: before 11.004

1756-EN2TPK Series A: before 11.004

1756-EN2TPXT Series A: before 11.004

1756-EN2TR Series A: before 5.009

1756-EN2TR Series B: before 5.009

1756-EN2TR Series C: before 11.004

1756-EN2TRK Series A: before 5.009

1756-EN2TRK Series B: before 5.009

1756-EN2TRK Series C: before 11.004

1756-EN2TRXT Series A: before 5.009

1756-EN2TRXT Series C: before 11.004

1756-EN2F Series A: before 5.009

1756-EN2F Series C: before 11.004

1756-EN2FK Series A: before 5.009

1756-EN2FK Series C: before 11.004

1756-EN3TR Series A: before 5.029

1756-EN3TR Series B: before 11.004

1756-EN3TRK Series A: before 5.029

1756-EN3TRK Series B: before 11.004

---

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

---

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.