title: Secheron SEPCOS Control and Protection Relay
description: Controls limiting uploads to certain file extensions may be bypassed. This could allow an attacker to intercept the initial file upload page response and modify the associated code. This modified code can be forwarded and used by a script loaded later in the sequence, allowing for arbitrary file upload into a location where PHP scripts may be executed.
problem types: CWE-841  IMPROPER ENFORCEMENT OF BEHAVIORAL WORKFLOW
affected:
{
product: SEPCOS Control and Protection Relay firmware package
vendor: Secheron
versions:
changes: [at: 1.24.8, status: unaffected], lessThan: 1.23.21, status: affected, version: All versions, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.4
baseSeverity: CRITICAL
confidentialityImpact: LOW
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
version: 3.1
]
solutions: Secheron recommends updating its software to the latest version:
SEPCOS Single Package firmware (1.23.xx feature level): Update to 1.23.22 or higher version
SEPCOS Single Package firmware (1.24.xx feature level): Update to 1.24.8 or higher version
SEPCOS Single Package firmware (1.25.xx feature level): Update to 1.25.3 or higher version
workarounds: Additional workarounds are suggested to help reduce the risk:
Configure the network such that PLC communications are strictly limited to only the devices required to perform its functions.
Limit remote access and close Ports 80 and 443 at the switch level.
Only use approved devices to connect to the PLCs. Do not connect personal peripherals (USB sticks, hotspots) to approved devices.
Check device logs during periodic maintenance for unauthorized changes or access.