Summary
For mGuard devices with integrated switch on the LAN side, single switch ports can be disabled by device configuration. After a reboot these ports get functional independent from their configuration setting: Missing Initialization of Resource (CWE-909).
Details
Impact
After a reboot, affected mGuard devices may unexpectedly receive or send data on disabled switch ports. This includes the unexpected provision of administrative interfaces. Attackers may try to access confidential data or compromise the availability of mGuard services by flooding or resource exhaustion.
Mitigation
Instead of deactivating by configuration, network cables should be detached from affected switch
ports.
Remediation
Mitigation Instead of deactivating by configuration, network cables should be detached from affected switchports. Solution PHOENIX CONTACT recommends all mGuard users to upgrade to the firmware version 8.8.3.
Vulnerabilities 1
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Medium 5.4
Phoenix Contact mGuard Devices versions before 8.8.3: LAN ports get functional after reboot even if they are disabled in the device configuration
On Phoenix Contact mGuard Devices versions before 8.8.3 LAN ports get functional after reboot even if they are disabled in the device configuration. For mGuard devices with integrated switch on the LAN side, single switch ports can be disabled by device confi…
Revision history
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#2
Fix: removed ia, added distribution
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#1
Initial revision.
References
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Phoenix Contact PSIRT
https://www.phoenixcontact.com/de-de/service-und-support/psirt
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CERT@VDE Security Advisories for Phoenix Contact GmbH & Co. KG
https://certvde.com/en/advisories/vendor/phoenixcontact
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VDE-2020-046: PHOENIX CONTACT: mGuard <8.8.3 products missing initialization of resource - HTML
https://certvde.com/en/advisories/VDE-2020-046/