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Tuleap 9.6.99.86 Command Injection

Tuleap 9.6.99.86 Command Injection
Posted Apr 29, 2017
Authored by Ben N

Tuleap versions between 8.3 and 9.6.99.86 suffer from a remote command injection vulnerability.

tags | exploit, remote
advisories | CVE-2017-7981
MD5 | 20d23fc7b97753cd5df0992bb805d536

Tuleap 9.6.99.86 Command Injection

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# Tuleap - Command Injection in Project Wiki

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.

## 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

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
?>


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

## Credit

This vulnerability was discovered by Ben N (pajexali@gmail.com) 19 April
2017.

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