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)