Zyxel security advisory for cleartext storage of information vulnerability

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CVE: CVE-2021-35036

Summary

Zyxel is releasing patches addressing a cleartext storage of information vulnerability in its products. Users are advised to install the patches for optimal protection.


What is the vulnerability?

The cleartext storage of information vulnerability is due to a CGI program lacking proper protection of the device’s login privilege and TR-069 configuration. The vulnerability cannot be exploited unless the attacker can first be successfully authenticated and log in to the device’s management interface. The TR-069 protocol is not enabled by default in the generic version of the firmware; therefore, it cannot be exploited by attackers.


What versions are vulnerable—and what should you do?

After a thorough investigation, we have identified the vulnerable products that are within their vulnerability support period, with their firmware patches shown in the table below.

Product

Affected model

Patch availability*

DSL/Ethernet CPE

VMG3625-T50B

  • Customized firmware version V5.50(ABTL.0)b2r
  • EMEA: V5.50(ABPM.7)C0
  • Central America: V5.50(ACCR.0)b4

VMG3927-T50K

V5.50(ABOM.8)C0

VMG8623-T50B

V5.50(ABPM.7)C0

VMG8825-T50K

V5.50(ABOM.8)C0

EMG3525-T50B

V5.50(ABPM.7)C0

EMG5523-T50B

V5.50(ABPM.7)C0

EMG5723-T50K

V5.50(ABOM.8)C0

DX3301-T0

V5.50(ABVY.3)C0

DX5401-B0

V5.17(ABYO.2)C0

EX5401-B0

V5.17(ABYO.2)C0

EX5501-B0

V5.17(ABRY.3)C0

Fiber ONT

AX7501-B Series

V5.17(ABPC.2)C0

EP240P

V5.40(ABVH.0)C0a03

PMG5617GA

V5.40(ABNA.2)C0

PMG5622GA

V5.40(ABNB.2)C0

PMG5317-T20B

V5.40(ABKI.4)C0

PMG5617-T20B2

V5.41(ACBB.1)C0

PM7300-T0

V5.42(ACBC.1)C0

5G NR/4G LTE CPE

LTE3301-PLUS

V1.00(ABQU.6)C0 in Dec. 2022

LTE5388-M804

V1.00(ABSQ.4)C0 in Dec. 2022

LTE5388-S905

V1.00(ABVI.6)C0 in Dec. 2022

LTE5398-M904

V1.00(ABQV.2)C0 in Dec. 2022

LTE7240-M403

V2.00(ABMG.6)C0 in Dec. 2022

LTE7461-M602

V2.00(ABQN.6)C0 in Dec. 2022

LTE7480-S905

V2.00(ABQT.6)C0 in Dec. 2022

LTE7480-M804

V1.00(ABRA.6)C0 in Dec. 2022

LTE7485-S905

V1.00(ABVN.6)C0 in Dec. 2022

LTE7490-M804

V1.00(ABQY.5)C0 in Dec. 2022

NR5101

V1.00(ABVC.6)C0 in Dec. 2022

NR7101

V1.00(ABUV.7)C0 in Dec. 2022

NR7102

V1.00(ABYD.2)C0 in Dec. 2022

*Please contact your sales representative or support team for the file.

For ISPs, please contact your Zyxel sales or service representatives for further details.

For end-users who received your Zyxel device from an ISP, we recommend you reach out to the ISP’s support team directly, as the device may have custom-built settings.

For end-users who purchased the Zyxel devices on your own, please contact your local Zyxel support team for the new firmware file to ensure optimal protection, or visit our forum for further assistance.


Got a question?

Please contact your local service rep or visit Zyxel’s Community  for further information or assistance.


Acknowledgment

Thanks to M.nageh for reporting the issue to us.


Revision history

2022-09-27: Initial release