CVE-2016-7980: SPIP 3.1.2 Exec Code Cross-Site Request Forgery

[Sysdream Labs <labs () sysdream com>]

## 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 <labs () sysdream com>

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* Website: https://sysdream.com/
* Twitter: @sysdream

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