Tuleap Project Wiki 8.3 < 9.6.99.86 - Command Injection

CVE: CVE-2017-7981



CVSSv3: 9.4 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:U/RC:C)



Versions affected: >= 8.3 and <= 9.6.99.86



Introduction

Tuleap is a Libre suite to plan, track, code and collaborate on software projects. Tuleap helps development teams to build awesome applications, better, faster, easier.



Background

Tuleap uses PHPWiki as a plugin to provide a weak feature for projects. The version of PHPWiki used is 1.3.10. This version contains a command injection vulnerability in the SyntaxHighlighter plugin. Other applications that use PHPWiki similar to Tuleap will also be affected by this issue.



The latest version of PHPWiki is 1.5.5 and is no longer vulnerable to this issue.





Vulnerability

Authenticated users, including unprivileged users, with access to a project containing a wiki, can exploit this command injection (CI) vulnerability to gain remote unauthorised access to the server hosting the Tuleap web application.



RCE is achieved by entering a SyntaxHighlighter plugin directive in a new wiki page on any wiki available in any project. The SyntaxHighligter plugin in vulnerable versions of PHPWiki passes the syntax argument to the proc_open() PHP builtin function which spawns a process in the operating system running the web application.



The following is an example plugin directie which would cause the id(1) command to be executed on a Linux server running an affected version of Tuleap.



<?plugin SyntaxHighlighter syntax="c;id"

code to be highlighted

?>





Versions Affected

This vulnerability has existed in the version of PHPWiki used by the Tuleap project since at least version 8.3 through to 9.6.99.86.





References

https://github.com/xdrr/vulnerability-research/blob/master/webapp/tuleap/2017.04.tuleap-auth-ci.md

https://tuleap.net/plugins/tracker/?aid=10159





Credit

This vulnerability was discovered by Ben N 19 April 2017.