Document Title: =============== Secutech DSL WR RIS 330 - Filter Bypass Vulnerability Date: ===== 2018-07-09 References: =========== https://www.vulnerability-lab.com/get_content.php?id=1988 VL-ID: ===== 1988 Common Vulnerability Scoring System: ==================================== 3.3 Vulnerability Class: ==================== Cross Site Scripting - Persistent Introduction: ============= The leader in the Venezuelan market, specializing in the development of safety devices, communication and networking for companies and households brand. This wireless router works with a speed up to 300Mbps are available in red, yellow, orange, blue, green and gray. It has three 5dBi antennas for better coverage. Supports WEP, WPA and WPA2 also supports WDS to continuously expand its wireless network. It complies with IEEE 802.11n/g/b. It works with any browser and its configuration is fast and easy using any Internet browser. (Copy of the Homepage: http://www.secutechnology.com/ris-22.html ) Abstract: ========= The vulnerability laboratory core research team discovered a filter bypass vulnerability in the official Secutech DSL Wireless Router RIS 330 web-application. Report-Timeline: ================ 2018-07-09: Public Disclosure (Vulnerability Laboratory) Status: ======== Published Affected Products: ================== SecuTech Product: DSL Router - Wireless RIS 300 v5.07.52_es_FRI01 Exploitation-Technique: ======================= Local Severity: ========= Medium Details: ======== A filter bypass web vulnerability has been discovered in the official Secutech DSL Wireless Router RIS 330 web-application. The filter bypass web vulnerability allows an attacker to evade the controls of a restriction- or protection mechanism. The issue allows an attacker to change the wireless passphrase to an insecure passphrase which is forbidden by the applications javascript engine & the current measures of minimum WPA Length less than 8 keys. The vulnerability affects the `Secutech DSL Routers` manufactured by Secutech Inc for communications. The remote attacker can request to add/edit via POST which changes the wireless passphrase. Then the attacker changes the followup parameter `wirelesspassword` to manipulate. The filter won`t allow authenticated users to set a passphrase less than 8 characters. The attack results in bypass f the filter and allows the attacker to setup any passphrase (wpa needs at least 8 chars) without secure approval. Thus issue can be exploited by automated scripts to perform attacks against the preeshare mechanism because of no secure request validation and restriction. The security risk of the bypass vulnerability is estimated as medium and the cvss (common vulnerability scoring system) count is 3.3. Exploitation of the filter bypass vulnerability requires a privileged web-application user account and medium user interaction. Successful exploitation of the vulnerability results in unauthorized access by setting a low secured passphrase key for WPA and WPA2. Request Method(s): [+] POST Vulnerable Module(s): [+] ./goform/wizardhandle Vulnerable Parameter(s): [+] wirelesspassword Proof of Concept: ================= The filter bypass vulnerability can be exploited by local attacker with privileged user account and without 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. Start the router for example in your local lan network 2. Access routers ui interface by usage of the network ip of the router (exp. 192.168.0.1) 3. Login to the router and access the interface 4. Run a session tamper or any other tool to intercept the http communication Setup the javascript filter , and change the wireless password into less than 8 or even just 1234 5. Process to submit the changes via POST 6. Successfully reproduce the local vulnerability! Video: https://www.youtube.com/watch?v=6OYaoRsoa0I --- PoC Session Logs [POST] --- POST /goform/WizardHandle HTTP/1.1 Host: localhost User-Agent: Mozilla/5.0 (X11; Linux i686; rv:47.0) Gecko/20100101 Firefox/47.0 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://localhost/index.asp Cookie: language=en; admin:language=en Connection: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 131 MACC=&GO=advance.asp&v12_time=1477567396.02&WANT1=3&net_type=2&PUN=Lawrence%40connecy.au&PPW=hivulnerable&wirelesspassword=7331 RESPONSE----- HTTP/1.0 302 Redirect Server: GoAhead-Webs Pragma: no-cache Cache-Control: no-cache Content-Type: text/html Location: http://localhost/notice.asp This document has moved to a new location. Please update your documents to reflect the new location. Solution: ========= The vulnerability can be patched by a restriction and approval of the affected key parameter in the POST method request. Disallow to save any input less then 8 characters to permanently grant the security of the customer using the mentioned hardware. Risk: ===== The security risk of the filter bypass router vulnerability in the password setup module is estimated as medium (CVSS 3.3). Credits: ======== Lawrence Amer [zeroattck@gmail.com] - https://www.vulnerability-lab.com/show.php?user=Lawrence+Amer Disclaimer: =========== 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. 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