Vulnerability Note VU#600724

ZTE F460/F660 cable modems contain an unauthenticated backdoor

Original Release date: 04 Mar 2014 | Last revised: 19 Mar 2014

Overview

ZTE F460/F660 cable modems contain an unauthenticated backdoor.

Description

ZTE F460/F660 cable modems contain an unauthenticated backdoor. The web_shell_cmd.gch script accepts unauthenticated commands that have administrative access to the device. It has been reported that the web_shell_cmd.gch script is sometimes accessible from the WAN interface making exploitation of this backdoor from the Internet possible in certain cases.

Additional details may be found in Rapid7's R7-2013-18 advisory.

ZTE has provided a statement about this vulnerability.

Impact

An unauthenticated attacker can run commands with administrator level access on the device.

Solution

We are currently unaware of a practical solution to this problem. Please consider the following workaround.

Remove Affected Script

Users can log into the device and manually delete the web_shell_cmd.gch script.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate Updated
ZTE CorporationAffected-19 Mar 2014
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base 8.3 AV:A/AC:L/Au:N/C:C/I:C/A:C
Temporal 7.1 E:H/RL:W/RC:UC
Environmental 5.3 CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

Credit

Thanks to Rapid7 for reporting this vulnerability.

This document was written by Jared Allar.

Other Information

  • CVE IDs: Unknown
  • Date Public: 03 Mar 2014
  • Date First Published: 04 Mar 2014
  • Date Last Updated: 19 Mar 2014
  • Document Revision: 17

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