#VU28995 Input validation error in FactoryTalk Linx and RSLinx Classic - CVE-2020-11999

Vulnerability identifier: #VU28995

Vulnerability risk: Medium

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Green]

CVE-ID: CVE-2020-11999

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FactoryTalk Linx
Server applications / SCADA systems
RSLinx Classic
Server applications / SCADA systems

Vendor: Rockwell Automation

Description

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to an exposed API call allows users to provide files to be processed without sanitation. A remote authenticated attacker can specify a filename to execute arbitrary code and modify files or data.

The following products that utilize FactoryTalk Linx Software are affected:

• Connected Components Workbench: Version 12 and prior
• ControlFLASH: Version 14 and later
• ControlFLASH Plus: Version 1 and later
• FactoryTalk Asset Centre: Version 9 and later
• FactoryTalk Linx CommDTM: Version 1 and later
• Studio 5000 Launcher: Version 31 and later
• Studio 5000 Logix Designer software: Version 32 and prior

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FactoryTalk Linx: 6.00 - 6.11

RSLinx Classic: 4.11.00

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External links
https://ics-cert.us-cert.gov/advisories/icsa-20-163-02

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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