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CVE-2017-6900 Detail


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.x Severity and Metrics:

Base Score:  9.8 CRITICAL
Vector:  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

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Hyperlink Resource
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 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-255 Credentials Management Errors cwe source acceptance level NIST  

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Change History

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Quick Info

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