SPIP 3.1.2 Cross Site Request Forgery

`## SPIP 3.1.2 Exec Code Cross-Site Request Forgery (CVE-2016-7980)  
  
### Product Description  
  
SPIP is a publishing system for the Internet, which put importance on collaborative working, multilingual environments and ease of use. It is free software, distributed under the GNU/GPL licence.  
  
### Vulnerability Description  
  
The vulnerable request to `valider_xml` (see: *SPIP 3.1.2 Template Compiler/Composer PHP Code Execution - CVE-2016-7998*) is vulnerable to Cross-Site Request Forgery, allowing the execution of the CVE-2016-7998 attack by tricking an administrator to open the malicious link.  
  
**Access Vector**: remote  
  
**Security Risk**: high  
  
**Vulnerability**: CWE-352  
  
**CVSS Base Score**: 8.3 (High)  
  
**CVE-ID**: CVE-2016-7980  
  
### Proof of Concept  
  
http://spip-dev.srv/ecrire/?exec=valider_xml&var_url=/tmp/directory&ext=html  
  
### Timeline (dd/mm/yyyy)  
  
* 15/09/2016 : Initial discovery  
* 26/09/2016 : Contact with SPIP Team  
* 27/09/2016 : Answer from SPIP Team, sent advisory details  
* 28/09/2016 : Fixes issued for CSRF  
* 30/09/2016 : SPIP 3.1.3 Released  
  
### Fixes  
  
* https://core.spip.net/projects/spip/repository/revisions/23200  
* https://core.spip.net/projects/spip/repository/revisions/23201  
* https://core.spip.net/projects/spip/repository/revisions/23202  
  
  
### Affected versions  
  
* Version <= 3.1.2  
  
### Credits  
  
* Nicolas CHATELAIN, Sysdream (n.chatelain -at- sysdream -dot- com)  
  
--   
SYSDREAM Labs <[email protected]>  
  
GPG :  
47D1 E124 C43E F992 2A2E  
1551 8EB4 8CD9 D5B2 59A1  
  
* Website: https://sysdream.com/  
* Twitter: @sysdream  
  
`