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Multiple Vulnerabilities in Buffalo and Arcadyan manufactured routers

High

Synopsis

Tenable has discovered multiple vulnerabilities in routers manufactured by Arcadyan.

During the disclosure process for the issues discovered in the Buffalo routers, Tenable discovered that CVE-2021-20090 affected many more devices, as the root cause of the vulnerability exists in the underlying Arcadyan firmware. 

Please note that CVE-2021-20091 and CVE-2021-20092 have only been confirmed on Buffalo WSR-2533 models.

CVE-2021-20090 : Path Traversal
CVSSv3 Base Score: 8.1
CVSSv3 Vector: AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
A path traversal vulnerability in the web interfaces of networking devices manufactured by Arcadyan, including Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24,  could allow unauthenticated remote attackers to bypass authentication.

This vulnerability has also been confirmed to affect the following devices:
Vendor Device Found on version
ADB ADSL wireless IAD router 1.26S-R-3P
Arcadyan ARV7519 00.96.00.96.617ES
Arcadyan VRV9517 6.00.17 build04
Arcadyan VGV7519 3.01.116
Arcadyan VRV9518 1.01.00 build44
ASMAX BBR-4MG / SMC7908 ADSL 0.08
ASUS DSL-AC88U (Arc VRV9517) 1.10.05 build502
ASUS DSL-AC87VG (Arc VRV9510) 1.05.18 build305
ASUS DSL-AC3100 1.10.05 build503
ASUS DSL-AC68VG 5.00.08 build272
Beeline Smart Box Flash 1.00.13_beta4
British Telecom WE410443-SA 1.02.12 build02
Buffalo WSR-2533DHPL2 1.02
Buffalo WSR-2533DHP3 1.24
Buffalo BBR-4HG
Buffalo BBR-4MG 2.08 Release 0002
Buffalo WSR-3200AX4S 1.1
Buffalo WSR-1166DHP2 1.15
Buffalo WXR-5700AX7S 1.11
Deutsche Telekom Speedport Smart 3 010137.4.8.001.0
HughesNet HT2000W 0.10.10
KPN ExperiaBox V10A (Arcadyan VRV9517) 5.00.48 build453
KPN VGV7519 3.01.116
O2 HomeBox 6441 1.01.36
Orange LiveBox Fibra (PRV3399) 00.96.00.96.617ES
Skinny Smart Modem (Arcadyan VRV9517) 6.00.16 build01
SparkNZ Smart Modem (Arcadyan VRV9517) 6.00.17 build04
Telecom (Argentina) Arcadyan VRV9518VAC23-A-OS-AM 1.01.00 build44
TelMex PRV33AC 1.31.005.0012
TelMex VRV7006
Telstra Smart Modem Gen 2 (LH1000) 0.13.01r
Telus WiFi Hub (PRV65B444A-S-TS) v3.00.20
Telus NH20A 1.00.10debug build06
Verizon Fios G3100 1.5.0.10
Vodafone EasyBox 904 4.16
Vodafone EasyBox 903 30.05.714
Vodafone EasyBox 802 20.02.226

CVE-2021-20091 : Configuration File Injection
CVSSv3 Base Score: 7.5
CVSSv3 Vector: AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
The web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 do not properly sanitize user input. An authenticated remote attacker could leverage this vulnerability to alter device configuration, potentially gaining remote code execution.

CVE-2021-20092 : Improper Access Control
CVSSv3 Base Score: 5.9
CVSSv3 Vector: AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
The web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 do not properly restrict access to sensitive information from an unauthorized actor.

Solution

Customers should seek update and mitigation information from their respective vendors.

Disclosure Timeline

January 24, 2021 - Tenable reports vulnerabilities to Buffalo Japan (buffalo.jp)
January 28, 2021 - Tenable tries to report vulnerabilities to Buffalo Group (buffalo-technology.com)
February 4, 2021 - Tenable reports vulnerabilities to Buffalo Americas (buffalotech.com)
February 9, 2021 - Buffalo Support confirms and escalates to Buffalo Japan
February 24, 2021 - Buffalo Japan confirms vulnerabilities, informs Tenable they are working on a patch
April 14, 2021 - Buffalo informs Tenable that they will disclose on April 26
April 21, 2021 - Tenable informs Verizon, Vodafone, O2 (Telefonica), Hughesnet
April 22, 2021 - Tenable informs Arcadyan that multiple vendors using their devices are affected
April 25, 2021 - Arcadyan confirms vulnerabilities and that they are working with one vendor to fix
April 25, 2021 - Tenable asks if Arcadyan can confirm a list of potentially affected vendors, and if they are helping those vendors to fix the issue. (Arcadyan stops responding)
April 26, 2021 - Advisory Initially Published
May 18, 2021 - Tenable discovers many more affected vendors, and decides to report to CERT Coordination Center
May 19, 2021 - CERT Coordination Center opens case in VINCE to help with reporting and disclosure
July 20, 2021 - Advisory updated with additional models affected by CVE-2021-20090

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

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