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WAGO has an update to handle multiple vulnerabilities in its Industrial Managed Switches 852-303, 852-1305, and 852-1505, according to a report with NCCIC.

The vulnerabilities are a use of hard-coded credentials, use of hard-coded cryptographic key, and using components with known vulnerabilities.

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Successful exploitation of these remotely exploitable vulnerabilities could allow a compromise of the managed switch, resulting in disruption of communication, and root access to the operating system. T. Weber of SEC Consult Vulnerability Lab discovered these vulnerabilities.

These vulnerabilities affect the following industrial managed switches:
• 852-303: All versions prior to v1.2.2.S0
• 852-1305: All versions prior to v1.1.6.S0
• 852-1505: All versions prior to v1.1.5.S0

Cyber Security

In one issue, an attacker with access to the hard-coded credentials may gain access to the operating system of the managed switch with root privileges, which may allow manipulation of the operating system of the managed switch.

CVE-2019-12550 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 9.8.

In addition, an attacker with access to the hard-coded SSH key may disrupt communication or compromise the managed switch. The SSH-keys cannot be regenerated by users and all switches use the same key.

CVE-2019-12549 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 9.8.

Also, the listed managed switches use outdated third-party components with known vulnerabilities. See the full list of CVE identifiers in CERT@VDE advisory number.

The product sees use mainly in the commercial facilities sector. It also sees action on a global basis.

No known public exploits specifically target these vulnerabilities. However, an attacker with low skill level could leverage the vulnerability.

Germany-based WAGO recommends users update their managed switch to the latest firmware published June 7 or later. New firmware can be requested in the Runtime Software dropdown within the Downloads section at the links below:
• 852-303: v1.2.2.S0 or later
• 852-1305: v1.1.6.S0 or later
• 852-1505: v1.1.5.S0 or later

WAGO also recommends users implement the following security measures:
• Restrict network access to the switch
• Restrict network access to the SSH server
• Do not directly connect the device to the Internet

For more information CERT@VDE has released a security notification.

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