Webmin – Read Mail Module Hardlink Arbitrary File Access (R911-0172)

Type: Hardlink Arbitrary File Access
Location: Local
Impact: High
Product: Webmin
Website: http://www.webmin.com/
Vulnerable Version: 1.720
Fixed Version: 1.730
CVE: CVE-2015-1377
R911: 0172
Date: 2015-01-27
By: RACK911

Product Description:

Webmin is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more. Webmin removes the need to manually edit Unix configuration files like /etc/passwd, and lets you manage a system from the console or remotely.

Vulnerability Description:

It is possible for a malicious user to view any file on the server, including root owned files, by creating a hardlink under the user accessible mail directory which will then be rendered within Webmin.

Impact:

We have deemed this vulnerability to be rated as HIGH due to the fact that sensitive information can be obtained.

Vulnerable Version:

This vulnerability was tested against Webmin 1.720.

Fixed Version:

This vulnerability was patched in Webmin 1.730.

Vendor Contact Timeline:

2014-12-09: Vendor contacted via email.
2014-12-09: Vendor confirms vulnerability.
2015-01-01: Vendor issues 1.730 update.
2015-01-27: RACK911 issues security advisory.