CVE-2020-12523 Security feature bypass in FL MGUARD RS4004 TX/DTX (2701876)
Disabled LAN ports on Phoenix Contact mGuard devices become active after reboot, bypassing security configurations and exposing network segments.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-12523?
CVE-2020-12523 is a medium-severity vulnerability in Innominate FL MGUARD RS4004 TX/DTX (2701876), published on 17 Dec 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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 configuration. After a reboot these ports get functional independent from their configuration setting: Missing Initialization of Resource
Weakness: CWE-909
Which versions are affected by CVE-2020-12523?
It affects 9 products.
Products include Phoenixcontact Fl Mguard Rs4004 Tx\/Dtx Firmware, Phoenixcontact Fl Mguard Rs4004 Tx\/Dtx Vpn Firmware, Phoenixcontact Innominate Mguard Rs4000 4tx\/3g\/Tx Vpn Firmware, Phoenixcontact Innominate Mguard Rs4000 4tx\/Tx Firmware, Phoenixcontact Innominate Mguard Rs4000 4tx\/Tx Vpn Firmware, Phoenixcontact Tc Mguard Rs4000 3g Vpn Firmware and 3 more.
How do I fix CVE-2020-12523?
No fix has been published for CVE-2020-12523 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-12523 being exploited?
There is no known exploitation of CVE-2020-12523 in the wild and no public exploit code.
Sources
Also known as GHSA-fwfg-74jc-wgx8.