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Valmet DNA Remote Code Execution

CVE-2021-26726

Summary

A remote code execution vulnerability affecting a Valmet DNA service listening on TCP port 1517 allows an attacker to execute commands with SYSTEM privileges

Impact

An un-authenticated network user can craft specific packets targeting a Valmet DNA service, listening by default on TCP port 1517. By exploiting a predictable encryption key, the attacker can trigger commands that will be executed on the remote machine with the SYSTEM privileges.

Issue Date

February 16, 2022

Affects

The vulnerability affects the following Valmet DNA versions:
Valmet DNA versions from Collection 2012 to Collection 2021

CVE Name

CVE-2021-26726

CVSS Details

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C/CR:H/IR:H/AR:H/MAV:A/MAC:L/MPR:N/MUI:N/MS:U/MC:H/MI:H/MA:H

CVSS Score

8.8

Solution

The fix is available from Valmet Automation Customer Service

Mitigations

Valmet suggest to use a properly configured firewall to prevent unauthorized access from untrusted networks to the system.

Acknowledgments

Ivan Speziale of Nozomi Networks

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