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Vulnerability record · CVE-2017-6900 · published 3 July 2019

CVE-2017-6900: Riello-ups netman 204 firmware vulnerability

Riello Ups · Netman 204 Firmware

An issue was discovered in Riello NetMan 204 14-2 and 15-2. The issue is with the login script and wrongpass Python script used for authentication. When calling wrongpass, the variables $VAL0 and $VAL1 should be enclosed in quotes to prevent the potential for Bash command injection. Further to this, VAL0 and VAL1 should be sanitised to ensure they do not contain malicious characters. Passing it the username of '-' will cause it to time out and log the user in because of poor error handling. This will log the attacker in as an administrator where the telnet / ssh services can be enabled, and the credentials for local users can be reset. Also, login.cgi accepts the username as a GET parameter, so login can be achieved by browsing to the /cgi-bin/login.cgi?username=-%20a URI.

9.8 CVSS 3.0 Critical EPSS 2.6% · top 15.1% CWE-255 · CWE-255
9.8CVSS 3.0 base score, v2 10.0
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in Riello NetMan 204 14-2 and 15-2. The issue is with the login script and wrongpass Python script used for authentication. When calling wrongpass, the variables $VAL0 and $VAL1 should be enclosed in quotes to prevent the potential for Bash command injection. Further to this, VAL0 and VAL1 should be sanitised to ensure they do not contain malicious characters. Passing it the username of '-' will cause it to time out and log the user in because of poor error handling. This will log the attacker in as an administrator where the telnet / ssh services can be enabled, and the credentials for local users can be reset. Also, login.cgi accepts the username as a GET parameter, so login can be achieved by browsing to the /cgi-bin/login.cgi?username=-%20a URI.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.synack.co.uk/2017/01/31/my-first-exploit-db-post/ Broken Link
https://web.archive.org/web/20170205100702/https://blog.synack.co.uk/2017/01/31/my-first-exploit-db-post/ Third Party Advisory
https://blog.synack.co.uk/2017/01/31/my-first-exploit-db-post/ Broken Link
https://web.archive.org/web/20170205100702/https://blog.synack.co.uk/2017/01/31/my-first-exploit-db-post/ Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2024-8878Riello-ups netman 204 firmware weak password recovery vulnerabilityThe password recovery mechanism for the forgotten password in Riello Netman 204 allows an attacker to reset the admin password and take over control …EPSS 1.3%9.8CVE-2022-47893Riello-ups netman 204 firmware unrestricted file upload vulnerabilityThere is a remote code execution vulnerability that affects all versions of NetMan 204. A remote attacker could upload a firmware file containing a w…EPSS 1.2%8.8CVE-2022-47891Riello-ups netman 204 firmware hard-coded credentials vulnerabilityAll versions of NetMan 204 allow an attacker that knows the MAC and serial number of the device to reset the administrator password via the legitimat…EPSS 0.61%8.8CVE-2022-3372Riello-ups netman 204 firmware cross-site request forgery vulnerabilityThere is a CSRF vulnerability on Netman-204 version 02.05. An attacker could manage to change administrator passwords through a Cross Site Request Fo…EPSS 0.35%7.5CVE-2022-47892Riello-ups netman 204 firmware information exposure vulnerabilityAll versions of NetMan 204 could allow an unauthenticated remote attacker to read a file (config.cgi) containing sensitive information, like credenti…EPSS 0.48%6.9CVE-2024-8877Riello Netman 204 SQL injection in measurement data databaseRiello Netman 204 firmware through 4.05 fails to neutralize special elements, allowing SQL injection into the SQLite database that stores measurement…EPSS 77%analysed8.8CVE-2014-1812Microsoft Windows Group Policy Preferences credential exposure and privilege escalationGroup Policy Preferences in multiple Windows versions stored and distributed passwords in a way that did not properly protect them, allowing any auth…KEVEPSS 65%analysed

Source: NIST National Vulnerability Database (record CVE-2017-6900), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.