Document Title:
===============
Barracuda Networks Firewall v6.1.5 - Filter Bypass & Persistent Vulnerabilities
References (Source):
====================
http://www.vulnerability-lab.
Barracuda Networks Security ID (BNSEC): BNSEC-2067
https://www.barracuda.com/
Video: http://www.vulnerability-lab.
View Video: http://www.youtube.com/watch?
Release Date:
=============
2014-07-24
Vulnerability Laboratory ID (VL-ID):
==============================
1065
Common Vulnerability Scoring System:
==============================
3.9
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/
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a filter bypass and multiple persistent input validation web vulnerabilities in the Barracuda Web Firewall appliance web-application.
Vulnerability Disclosure Timeline:
==============================
2013-09-04: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2013-09-05: Vendor Notification (Barracuda Networks Security Team - Bug Bounty Program)
2014-04-02: Vendor Response/Feedback (Barracuda Networks Security Team - Bug Bounty Program)
2014-07-15: Vendor Fix/Patch (Barracuda Networks Developer Team) [Coordinated Disclosure]
2014-07-24: 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 web vulnerabilities has been discovered in the Barracuda Networks Web Firewall X300 (v6.1.5) Appliance Web Application.
The validation web 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.
The vulnerability is located in the firewall menu when processing to create a custom user object with manipulated create user expression
group credentials. Remote attackers can inject script codes to the `Login Name` & `Group Match pattern text` input fields. After the inject
the attacker can save the input via add (POST Method) to execute the persistent code in the edit listing.
During the first add (inject) in the edit formular the remote attacker is also able to add the input via `add to the second selection` listing
to execute the persistent code in both listing values of the bottom page. Remote attackers are able to add the persistent injected context to
the main custom user objects module in the predefined user objects listing. The attack vector is persistent and the request method is POST.
The security risk of the persistent input validation web vulnerabilities are estimated as medium with a cvss (common vulnerability scoring system) count of 3.9.
Exploitation of the vulnerability 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 web module context.
Request Method(s):
[+] POST
Vulnerable Application(s):
[+] Firewall (WAF) Appliance Application (X300Vx v6.1.0.016 & 6.1.5.x )
Vulnerable Module(s):
[+] Firewall > User Objects > Custom User Objects > Create User Object > Create User Expression
Vulnerable Parameter(s):
[+] login name
[+] pattern - Group Match
Affected Module(s):
[+] Firewall > User Objects > Custom User Objects > Predefined User Objects Listing
[+] Firewall > User Objects > Custom User Objects > Create User Object > Create User Expression (Group)
Proof of Concept (PoC):
=======================
The persistent input validation web vulnerabilities can be exploited by remote attackers with low privileged application user account and low
user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.
Manual steps to reproduce the vulnerability:
1. Login with the user account to the barracuda networks web firewall appliance application
2. After the login open the firewall and switch to the User Objects > Custom User Objects > Create User Object module
3. Start creating via user expression a group
4. Include a random name for the main mask, and add your script code as payload to the login name and pattern (group match) input fields
5. Click the checkbox for the group match and click the add button to save the input
6. The code executes in the add box context itself and the group match or pattern values listing (bottom) [3 times]
7. Now, the attacker is also able to add the already injected persistent context to the main menu listing by a click of the add button to save at the bottom
8. The script code execution occurs when processing to watch the firewall_user_objects module index item listing
Note: The vulnerable values are login name (name) and pattner
9. Successful reproduce of the persistent web vulnerabilities!
PoC: firewall_user_objects - index listing
<tr style="" class="config_module_tr display oddRow" id="config_module_rowfw_
onmouseout="if (!this.isSelected) {this.style.background=this.
onmouseover="if (!this.isSelected) {this.prevBackground=this.
<td style="width: 150px;"> </td>
<td style="width: 200px;"> </td>
<td style="width:150px"><[
<td style="width:250px"><[
<td style="width: 116px;"> </td>
</tr>
Reference(s):
https://firewall.ptest.
?auth_type=Local&et=
PoC: Create User Object > Create User Expression - Listing
<tr class="config_module_tr" id="config_module_row_4">
<td valign="top" width="15"> </td>
<td valign="top" width="100">Group Match</td>​​&#
<td valign="top" width="400"><table class="config_module IT" frame="box" id="group_match_table" rules="none" summary="Box"
cellpadding="0" cellspacing="0"><tbody><tr bgcolor="#cccccc"><td style="text-align:center;"><b>
<td style="text-align:center;" width="20"><b></b></td></tr><
id="group_match_pattern" name="group_match_pattern" size="30" type="text"></td><td width="20"><input class="new_button"
id="+" name="+" onclick="add_group_match_
<tr class="pattern"><td>a%20>"<[
name="0" type="button"></td>​&#
<label for="pattern_group_match:yes" style="display:inline">All Group Patterns must match</label></td>
<td valign="top" width="120"><div id="helpbox"><b class="outlinetop">
<b class="outline1"></b>
<b class="outline2"></b>
<b class="outline3"></b>
<b class="outline4"></b></b>
<div id="contents"><div>List of user group patterns according to efficient authentication method.<br>
If the check box is cleared, only one list item may match. <b>Default</b>: Off</div></div>
<b class="outlinebottom"><b class="outline4"></b><b class="outline3"></b><b class="outline2"></b><b class="outline1"></b></b>
</div></td></tr>
... && Add
<tbody><tr bgcolor="#cccccc"><td style="text-align:center;" width="100">​​&#
width="100"><b>Group Match</b></td><td style="text-align:center;" width="50"><b></b></td></tr>
<tr class="pattern">
<td>a%20>"<[PERSISTENT INJECTED SCRIPT CODE!]"></iframe></td><td>a%
</iframe></td><td><img style="cursor:pointer;" name="0" src="/images/edit.png"><input name="0" src="/images/del.png" type="image"></td></tr></
--- Request Session Logs ---
Status: 200[OK]
POST https://firewall.ptest.
Load Flags[LOAD_BYPASS_CACHE LOAD_BACKGROUND ]
Content Size[-1] Mime Type[text/plain]
Request Headers:
Host[firewall.ptest.localhost:
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.
Accept-Encoding[gzip, deflate]
DNT[1]
X-Requested-With[
X-Prototype-Version[1.7]
Content-Type[application/x-
Referer[https://firewall.
password=
firewall_user_objects&auth_
parent_name=add_firewall_user_
Content-Length[237]
Connection[keep-alive]
Pragma[no-cache]
Cache-Control[no-cache]
Post Data:
ajax_action[check_param_ajax_
name[group_match_pattern]
value[(PERSISTENT INJECTED SCRIPT CODE!)<]
user[guest]
password[
et[1378331075]
locale[en_US]
auth_type[Local]
realm[]
Response Headers:
Server[BarracudaFirewallHTTP 4.0]
Date[Wed, 04 Sep 2013 21:26:16 GMT]
Content-Type[text/plain; charset=utf-8]
Transfer-Encoding[chunked]
Connection[keep-alive]
GET https://firewall.ptest.
Load Flags[LOAD_DOCUMENT_URI ]
Content Size[1789] Mime Type[text/html]
Request Headers:
Host[firewall.ptest.cudasvc.
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0]
Accept[text/html,application/
Accept-Language[en-US,en;q=0.
Accept-Encoding[gzip, deflate]
DNT[1]
Referer[https://firewall.
1&primary_tab=FIREWALL&new_
add_firewall_user_object&
Connection[keep-alive]
Response Headers:
Server[BarracudaFirewallHTTP 4.0]
Date[Wed, 04 Sep 2013 21:26:16 GMT]
Content-Type[text/html]
Content-Length[1789]
Connection[keep-alive]
Reference(s):
https://firewall.ptest.
password=
&auth_type=Local&user=guest&
popup_width=530&popup_height=
https://firewall.ptest.
auth_type=Local&et=1378340277&
secondary_tab=firewall_user_
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse of the match group pattern and login name input fields in the firewall_user_objects module.
Encode also the vulnerable output item listing of the pattern text and login name in the main- and edit firewall_user_objects listing to prevent
further persistent script code injection attacks via POST method request. Implement the regular alos the regular formular validation of barracuda
the the item list module.
Barracuda Networks: Appliances > Advanced > Firmware Updates (automatic) page or use the regular customer panel
https://www.barracuda.com/
Security Risk:
==============
The security risk of the persistent input validation web vulnerabilities in connection with the input filter bypass are estimated as medium.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties,
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-
Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business
profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some
states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation
may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases
or trade with fraud/stolen material.
Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.evolution-sec.com
Contact: admin@vulnerability-lab.com - research@vulnerability-lab.com - admin@evolution-sec.com
Section: www.vulnerability-lab.com/dev - forum.vulnerability-db.com - magazine.vulnerability-db.com
Social: twitter.com/#!/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/
Feeds: vulnerability-lab.com/rss/rss.
Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory.
Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other
media, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and
other information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed),
modify, use or edit our material contact (admin@vulnerability-lab.com or research@vulnerability-lab.com
Copyright © 2014 | Vulnerability Laboratory [Evolution Security]
===============
Barracuda Networks Firewall v6.1.5 - Filter Bypass & Persistent Vulnerabilities
References (Source):
====================
http://www.vulnerability-lab.
Barracuda Networks Security ID (BNSEC): BNSEC-2067
https://www.barracuda.com/
Video: http://www.vulnerability-lab.
View Video: http://www.youtube.com/watch?
Release Date:
=============
2014-07-24
Vulnerability Laboratory ID (VL-ID):
==============================
1065
Common Vulnerability Scoring System:
==============================
3.9
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/
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a filter bypass and multiple persistent input validation web vulnerabilities in the Barracuda Web Firewall appliance web-application.
Vulnerability Disclosure Timeline:
==============================
2013-09-04: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2013-09-05: Vendor Notification (Barracuda Networks Security Team - Bug Bounty Program)
2014-04-02: Vendor Response/Feedback (Barracuda Networks Security Team - Bug Bounty Program)
2014-07-15: Vendor Fix/Patch (Barracuda Networks Developer Team) [Coordinated Disclosure]
2014-07-24: 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 web vulnerabilities has been discovered in the Barracuda Networks Web Firewall X300 (v6.1.5) Appliance Web Application.
The validation web 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.
The vulnerability is located in the firewall menu when processing to create a custom user object with manipulated create user expression
group credentials. Remote attackers can inject script codes to the `Login Name` & `Group Match pattern text` input fields. After the inject
the attacker can save the input via add (POST Method) to execute the persistent code in the edit listing.
During the first add (inject) in the edit formular the remote attacker is also able to add the input via `add to the second selection` listing
to execute the persistent code in both listing values of the bottom page. Remote attackers are able to add the persistent injected context to
the main custom user objects module in the predefined user objects listing. The attack vector is persistent and the request method is POST.
The security risk of the persistent input validation web vulnerabilities are estimated as medium with a cvss (common vulnerability scoring system) count of 3.9.
Exploitation of the vulnerability 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 web module context.
Request Method(s):
[+] POST
Vulnerable Application(s):
[+] Firewall (WAF) Appliance Application (X300Vx v6.1.0.016 & 6.1.5.x )
Vulnerable Module(s):
[+] Firewall > User Objects > Custom User Objects > Create User Object > Create User Expression
Vulnerable Parameter(s):
[+] login name
[+] pattern - Group Match
Affected Module(s):
[+] Firewall > User Objects > Custom User Objects > Predefined User Objects Listing
[+] Firewall > User Objects > Custom User Objects > Create User Object > Create User Expression (Group)
Proof of Concept (PoC):
=======================
The persistent input validation web vulnerabilities can be exploited by remote attackers with low privileged application user account and low
user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.
Manual steps to reproduce the vulnerability:
1. Login with the user account to the barracuda networks web firewall appliance application
2. After the login open the firewall and switch to the User Objects > Custom User Objects > Create User Object module
3. Start creating via user expression a group
4. Include a random name for the main mask, and add your script code as payload to the login name and pattern (group match) input fields
5. Click the checkbox for the group match and click the add button to save the input
6. The code executes in the add box context itself and the group match or pattern values listing (bottom) [3 times]
7. Now, the attacker is also able to add the already injected persistent context to the main menu listing by a click of the add button to save at the bottom
8. The script code execution occurs when processing to watch the firewall_user_objects module index item listing
Note: The vulnerable values are login name (name) and pattner
9. Successful reproduce of the persistent web vulnerabilities!
PoC: firewall_user_objects - index listing
<tr style="" class="config_module_tr display oddRow" id="config_module_rowfw_
onmouseout="if (!this.isSelected) {this.style.background=this.
onmouseover="if (!this.isSelected) {this.prevBackground=this.
<td style="width: 150px;"> </td>
<td style="width: 200px;"> </td>
<td style="width:150px"><[
<td style="width:250px"><[
<td style="width: 116px;"> </td>
</tr>
Reference(s):
https://firewall.ptest.
?auth_type=Local&et=
PoC: Create User Object > Create User Expression - Listing
<tr class="config_module_tr" id="config_module_row_4">
<td valign="top" width="15"> </td>
<td valign="top" width="100">Group Match</td>​​&#
<td valign="top" width="400"><table class="config_module IT" frame="box" id="group_match_table" rules="none" summary="Box"
cellpadding="0" cellspacing="0"><tbody><tr bgcolor="#cccccc"><td style="text-align:center;"><b>
<td style="text-align:center;" width="20"><b></b></td></tr><
id="group_match_pattern" name="group_match_pattern" size="30" type="text"></td><td width="20"><input class="new_button"
id="+" name="+" onclick="add_group_match_
<tr class="pattern"><td>a%20>"<[
name="0" type="button"></td>​&#
<label for="pattern_group_match:yes" style="display:inline">All Group Patterns must match</label></td>
<td valign="top" width="120"><div id="helpbox"><b class="outlinetop">
<b class="outline1"></b>
<b class="outline2"></b>
<b class="outline3"></b>
<b class="outline4"></b></b>
<div id="contents"><div>List of user group patterns according to efficient authentication method.<br>
If the check box is cleared, only one list item may match. <b>Default</b>: Off</div></div>
<b class="outlinebottom"><b class="outline4"></b><b class="outline3"></b><b class="outline2"></b><b class="outline1"></b></b>
</div></td></tr>
... && Add
<tbody><tr bgcolor="#cccccc"><td style="text-align:center;" width="100">​​&#
width="100"><b>Group Match</b></td><td style="text-align:center;" width="50"><b></b></td></tr>
<tr class="pattern">
<td>a%20>"<[PERSISTENT INJECTED SCRIPT CODE!]"></iframe></td><td>a%
</iframe></td><td><img style="cursor:pointer;" name="0" src="/images/edit.png"><input name="0" src="/images/del.png" type="image"></td></tr></
--- Request Session Logs ---
Status: 200[OK]
POST https://firewall.ptest.
Load Flags[LOAD_BYPASS_CACHE LOAD_BACKGROUND ]
Content Size[-1] Mime Type[text/plain]
Request Headers:
Host[firewall.ptest.localhost:
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.
Accept-Encoding[gzip, deflate]
DNT[1]
X-Requested-With[
X-Prototype-Version[1.7]
Content-Type[application/x-
Referer[https://firewall.
password=
firewall_user_objects&auth_
parent_name=add_firewall_user_
Content-Length[237]
Connection[keep-alive]
Pragma[no-cache]
Cache-Control[no-cache]
Post Data:
ajax_action[check_param_ajax_
name[group_match_pattern]
value[(PERSISTENT INJECTED SCRIPT CODE!)<]
user[guest]
password[
et[1378331075]
locale[en_US]
auth_type[Local]
realm[]
Response Headers:
Server[BarracudaFirewallHTTP 4.0]
Date[Wed, 04 Sep 2013 21:26:16 GMT]
Content-Type[text/plain; charset=utf-8]
Transfer-Encoding[chunked]
Connection[keep-alive]
GET https://firewall.ptest.
Load Flags[LOAD_DOCUMENT_URI ]
Content Size[1789] Mime Type[text/html]
Request Headers:
Host[firewall.ptest.cudasvc.
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0]
Accept[text/html,application/
Accept-Language[en-US,en;q=0.
Accept-Encoding[gzip, deflate]
DNT[1]
Referer[https://firewall.
1&primary_tab=FIREWALL&new_
add_firewall_user_object&
Connection[keep-alive]
Response Headers:
Server[BarracudaFirewallHTTP 4.0]
Date[Wed, 04 Sep 2013 21:26:16 GMT]
Content-Type[text/html]
Content-Length[1789]
Connection[keep-alive]
Reference(s):
https://firewall.ptest.
password=
&auth_type=Local&user=guest&
popup_width=530&popup_height=
https://firewall.ptest.
auth_type=Local&et=1378340277&
secondary_tab=firewall_user_
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse of the match group pattern and login name input fields in the firewall_user_objects module.
Encode also the vulnerable output item listing of the pattern text and login name in the main- and edit firewall_user_objects listing to prevent
further persistent script code injection attacks via POST method request. Implement the regular alos the regular formular validation of barracuda
the the item list module.
Barracuda Networks: Appliances > Advanced > Firmware Updates (automatic) page or use the regular customer panel
https://www.barracuda.com/
Security Risk:
==============
The security risk of the persistent input validation web vulnerabilities in connection with the input filter bypass are estimated as medium.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties,
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-
Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business
profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some
states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation
may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases
or trade with fraud/stolen material.
Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.evolution-sec.com
Contact: admin@vulnerability-lab.com - research@vulnerability-lab.com - admin@evolution-sec.com
Section: www.vulnerability-lab.com/dev - forum.vulnerability-db.com - magazine.vulnerability-db.com
Social: twitter.com/#!/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/
Feeds: vulnerability-lab.com/rss/rss.
Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory.
Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other
media, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and
other information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed),
modify, use or edit our material contact (admin@vulnerability-lab.com or research@vulnerability-lab.com
Copyright © 2014 | Vulnerability Laboratory [Evolution Security]