WiseGiga NAS CSRF / LFI / Command Execution

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  • WiseGiga NAS suffers from cross site request forgery, local file inclusion, command execution, and default credential vulnerabilities.
    MD5 | 047939def71293ad9bd51f3067e33736

    Source: https://blogs.securiteam.com/index.php/archives/3402  
    Vulnerabilities summary  
    The following advisory describes five (5) vulnerabilities and default accounts / passwords found in WiseGiga NAS devices.  
    WiseGiga is a Korean company selling NAS products.  
    The vulnerabilities found in WiseGiga NAS are:  
    Pre-Authentication Local File Inclusion (4 different vulnerabilities)  
    Post-Authentication Local File Inclusion  
    Remote Command Execution as root  
    Remote Command Execution as root with CSRF  
    Info Leak  
    Default accounts  
    An independent security researcher, Pierre Kim, has reported this vulnerability to Beyond Securityas SecuriTeam Secure Disclosure program  
    Vendor response  
    We tried to contact WiseGiga since June 2017, repeated attempts to establish contact went unanswered. At this time there is no solution or workaround for these vulnerabilities.  
    Vulnerabilities details  
    Pre-Authentication Local File Inclusion  
    User controlled input is not sufficiently sanitized and can be exploit by an attacker to get sensitive information (for example, passwords).  
    By sending GET request to the following URIas with filename= as a parameter, an attacker can trigger the vulnerabilities:  
    Proof of Concept  
    Post-Authentication Local File Inclusion  
    User controlled input is not sufficiently sanitized and can be exploit by an attacker to get sensitive information (for example, passwords).  
    By sending GET request to /mobile/download_file2.php an attacker can trigger the vulnerability.  
    Proof of Concept  
    Remote Command Execution as root  
    The WiseGiga NAS firmware contain pre.php files in the different directories.  
    For example:  
    A astandarda pre.php contains:  
    181 [...]  
    182 function  auth()  
    183 {   
    184  global $memberid;  
    185  session_start();  
    186 //echo $memberid;  
    187  if($memberid=="root")  
    188  {  
    189   // print<<<__DATA_OF_HTML__  
    190   //<script language="JavaScript">  
    191   //  alert("sucess !");  
    192   //</script>  
    193 //__DATA_OF_HTML__;  
    194  }  
    195  else  
    196  {  
    197   print<<<__DATA_OF_HTML__  
    198   <script language="JavaScript">  
    199     alert("\xc0\xce\xc1\xf5\xb9\xde\xc1\xf6 \xbe\xca\xc0\xba \xbb\xe7\xbf\xeb\xc0\xda\xc0\xd4\xb4\xcf\xb4\xd9!");  
    200 //    location.href='/admin/';  
    201       window.open('index.php','_parent');  
    202     exit;  
    203   </script>  
    204 __DATA_OF_HTML__;  
    205  }  
    207 }  
    Using global $memberid (line 184), the attacker can override the authentication, by specifying a valid user (aroota) inside the HTTP request:  
    GET /webpage[...]?memberid=root&[...] HTTP/1.0  
    The pre.php files also contains a function called root_exec_cmd() that is a wrapper to popen():  
    23 function root_exec_cmd($cmd)  
    24 {  
    25         $tmpfile=fopen("/tmp/ramdisk/cmd.list","w");  
    26         fwrite($tmpfile,$cmd);  
    27         fclose($tmpfile);  
    28         popen("/tmp/ramdisk/ramush","r");  
    29 }  
    By sending a GET request to root_exec_cmd() with user controlled $cmd variable input an attacker can execute arbitrary commands  
    The WiseGiga NAS runas the Apache server as root (uid=0 with gid=48 aapachea) hence the commands will execute as root.  
    Proof of Concept  
    By sending GET request to /admin/group.php with parameter ?cmd=add the WiseGiga NAS will call the add_system() function:  
    178 if($cmd == "add")  
    179 {  
    180         add_system();  
    181 }  
    The add_system() function uses global for $group_name and $user_data.  
    Then it will pass the user controlled input and will run it as root:  
    145 function add_system()  
    146 {  
    147         global $group_name,$user_data;  
    149     if(add_conf()==1)  
    150     {  
    151 //====================================================================================  
    152         root_exec_cmd("addgroup $group_name");  
    An attacker can get unauthenticated RCE as root by sending the following request:  
    The file /tmp/a will contain:  
    uid=0(root) gid=48(apache) groups=48(apache)  
    Remote Command Execution as root with CSRF  
    There is no CSRF protection in WiseGiga NAS.  
    An attacker can force the execution of a command as root when the victim visits the malicious website.  
    Proof of Concept  
    Once the victim visit the attackeras website with the following code, the attacker can execute arbitrary commands.  
    <img src=";COMMANDTOEXECUTE">  
    accessing http://IP/webfolder/config/config.php will disclose the PHP configuration.  
    Default accounts  
    Username: guest  
    Password: guest09#$  

    Source: packetstormsecurity.com

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