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Crestron AirMedia AM-100 contains multiple vulnerabilities

Vulnerability Note VU#603047

Original Release Date: 2016-08-01 | Last Revised: 2016-08-02

Overview

The Crestron AirMedia AM-100 with firmware prior to version 1.4.0.13 is vulnerable to path traversal and command injection.

Description

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') - CVE-2016-5639


A path traversal vulnerability exists in login.cgi (and possibly other binaries in the /home/boa/cgi-bin directory) on the AM-100 embedded web server. The src GET parameter passed to login.cgi specifies the relative path to a file for rendering, such as AwLoginDownload.html. However, the value of this parameter can specify an arbitrary path on the AM-100 filesystem.

CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') - CVE-2016-5640

A command injection vulnerability exists in rftest.cgi on the AM-100 embedded web server. The ATE_COMMAND POST parameter specifies the path to a command for the underlying OS to execute. By default, the value of this parameter is /sbin/iwpriv; however, the value of this parameter can be a relative or absolute path to any arbitrary command on the underlying OS.

Crestron AirMedia AM-100 firmware v1.1.1.11 - v1.2.1 are confirmed affected by the researcher. For more information see the researcher's advisory one and advisory two.

Impact

An unauthenticated remote user may be able to access arbitrary files from the device filesystem, or execute arbitrary OS commands on the device.

Solution

Apply an update

Crestron has released firmware version 1.4.0.13 to address these issues. Affected users should update the firmware of their AM-100 as soon as possible.

Vendor Information

603047
Expand all

Crestron Electronics

Updated:  July 19, 2016

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C
Temporal 8.3 E:F/RL:OF/RC:C
Environmental 6.2 CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

Credit

Thanks to Zach Lanier of Cylance, Inc., for reporting this vulnerability.

This document was written by Garret Wassermann.

Other Information

CVE IDs: CVE-2016-5639, CVE-2016-5640
Date Public: 2016-08-01
Date First Published: 2016-08-01
Date Last Updated: 2016-08-02 15:15 UTC
Document Revision: 22

Sponsored by the Department of Homeland Security Office of Cybersecurity and Communications.