#VU39268 Use of hard-coded credentials in SoMachine - CVE-2017-7574

Vulnerability identifier: #VU39268

Vulnerability risk: High

CVSSv4.0: 8.1 [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:U/U:Amber]

CVE-ID: CVE-2017-7574

CWE-ID: CWE-798

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SoMachine
Server applications / SCADA systems

Vendor: Schneider Electric

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Schneider Electric SoMachine Basic 1.4 SP1 and Schneider Electric Modicon TM221CE16R 1.3.3.3 devices have a hardcoded-key vulnerability. The Project Protection feature is used to prevent unauthorized users from opening an XML protected project file, by prompting the user for a password. This XML file is AES-CBC encrypted; however, the key used for encryption (SoMachineBasicSoMachineBasicSoMa) cannot be changed. After decrypting the XML file with this key, the user password can be found in the decrypted data. After reading the user password, the project can be opened and modified with the Schneider product.

Mitigation
Install update from vendor's website.

Vulnerable software versions

SoMachine: 1.4

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External links
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2017-097-01
https://www.securityfocus.com/bid/97518
https://os-s.net/advisories/OSS-2017-02.pdf

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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?

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