Title: NethServer 7.3.1611 (create.json) CSRF Create User And Enable SSH Access
Advisory ID: ZSL-2017-5433
Type: Local/Remote
Impact: Cross-Site Scripting, System Access
Risk: (4/5)
Release Date: 29.08.2017

Summary

NethServer is an operating system for the Linux enthusiast, designed for small offices and medium enterprises. It's simple, secure and flexible.

Description

The application interface allows users to perform certain actions via HTTP requests without performing any validity checks to verify the requests. This can be exploited to perform certain actions with administrative privileges if a logged-in user visits a malicious web site.

Vendor

NethServer.org - https://www.nethserver.org

Affected Version

7.3.1611-u1-x86_64

Tested On

Kernel 3.10.0.-514.el7.x86_64 on an x86_64
CentOS Linux 7.3.1611 (Core)

Vendor Status

N/A

PoC

nethserver_csrf.html

Credits

Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>

References

[1] https://packetstormsecurity.com/files/143944
[2] https://cxsecurity.com/issue/WLB-2017080192
[3] https://www.exploit-db.com/exploits/42580/
[4] https://exchange.xforce.ibmcloud.com/vulnerabilities/131252

Changelog

[29.08.2017] - Initial release
[01.09.2017] - Added reference [4]

Contact

Zero Science Lab

Web: http://www.zeroscience.mk
e-mail: lab@zeroscience.mk