Usermin – Read Mail Module Hardlink Arbitrary File Access (R911-0171)

Type: Hardlink Arbitrary File Access
Location: Local
Impact: High
Product: Usermin
Vulnerable Version: 1.630
Fixed Version: 1.640
CVE: CVE-2015-1377
R911: 0171
Date: 2015-01-27
By: RACK911

Product Description:

Usermin is a web-based interface for webmail, password changing, mail filters, fetchmail and much more. It is designed for use by regular non-root users on a Unix system, and limits them to tasks that they would be able to perform if logged in via SSH or at the console.

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 Usermin.


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 Usermin 1.630.

Fixed Version:

This vulnerability was patched in Usermin 1.640.

Vendor Contact Timeline:

2014-12-09: Vendor contacted via email.
2014-12-09: Vendor confirms vulnerability.
2015-01-01: Vendor issues 1.640 update.
2015-01-27: RACK911 issues security advisory.