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Software Engineering Institute

CERT Coordination Center

DSL routers contain hard-coded "XXXXairocon" credentials

Vulnerability Note VU#950576

Original Release Date: 2015-08-25 | Last Revised: 2015-08-27

Overview

DSL routers by ASUS, DIGICOM, Observa Telecom, Philippine Long Distance Telephone (PLDT), and ZTE contain hard-coded "XXXXairocon" credentials

Description

CWE-798: Use of Hard-coded Credentials

DSL routers, including the ASUS DSL-N12E, DIGICOM DG-5524T, Observa Telecom RTA01N, Philippine Long Distance Telephone (PLDT) SpeedSurf 504AN and Kasda KW58293, and ZTE ZXV10 W300 contain hard-coded credentials that are useable in the telnet service on the device. In the ASUS, DIGICOM, Observa Telecom, and ZTE devices, the username is "admin," in the PLDT devices, the user name is "adminpldt," and in all affected devices, the password is "XXXXairocon" where "XXXX" is the last four characters of the device's MAC address. The MAC address may be obtainable over SNMP with community string public.

The vulnerability was previously disclosed in VU#228886 and assigned CVE-2014-0329 for ZTE ZXV10 W300, but it was not known at the time that the same vulnerability affected products published by other vendors. The Observa Telecom RTA01N was previously disclosed on the Full Disclosure mailing list.

Impact

A remote attacker may utilize these credentials to gain administrator access to the device.

Solution

The CERT/CC is currently unaware of a practical solution to this problem and recommends the following workaround:

Restrict access

Enable firewall rules so the telnet service of the device is not accessible to untrusted sources. Enable firewall rules that block SNMP on the device.

Vendor Information

950576
 
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AsusTek Computer Inc. Affected

Notified:  May 04, 2015 Updated: August 25, 2015

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

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

Addendum

The Asus DSL-N12E is affected.

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

DIGICOM (HK) Affected

Updated:  August 25, 2015

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

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

Vendor References

Addendum

DIGICOM DG-5624T is affected.

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

Observa Telecom Affected

Updated:  August 25, 2015

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

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

Vendor References

Addendum

Observa Telecom RTA01N is affected.

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

Philippine Long Distance Telephone Affected

Notified:  June 02, 2015 Updated: August 27, 2015

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

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

Addendum

Philippine Long Distance Telephone SpeedSurf 504AN and Kasda KW58293 are affected.

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

ZTE Corporation Affected

Notified:  December 03, 2013 Updated: August 25, 2015

Statement Date:   March 12, 2014

Status

Affected

Vendor Statement

'According to the vulnerability found in ZTE ZXV10 W300 router version 2.1.0, a mitigation measure has been adopted in the W300 general frame structure versions after 2011, which means the ZTE ZXV10 W300 router produced since 2011 has closed the telnet default function to avoid the information security

incident caused by such vulnerability. If any customer has a special requirement, please follow the instructions in our product manual to open the telnet function, but ZTE will not bear the legal liability for any security incident loss that might be the consequence of this operation. If you have any questions please contact us by calling our 24h service hotline +86-755-26770188.'

Vendor Information

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


CVSS Metrics

Group Score Vector
Base 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C
Temporal 8 E:POC/RL:U/RC:UR
Environmental 6.0 CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

Acknowledgements

Thanks to Walter Mostosi for reporting the issue affecting ASUS devices, Naresh LamGarde for DIGICOM devices, and to Eskie Cirrus James Maquilang for PLDT devices. Thanks again to Cesar Neira for reporting the issue in ZTE devices, and to Jose Antonio Rodriguez Garcia for disclosing the Observa Telecom vulnerability to Full Disclosure.

This document was written by Joel Land and Garret Wassermann.

Other Information

CVE IDs: None
Date Public: 2015-08-25
Date First Published: 2015-08-25
Date Last Updated: 2015-08-27 15:19 UTC
Document Revision: 19

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