Multiple Vulnerabilities in ZTE AC 3633R USB Modem

[vishnu raju <rajuvishnu52 () gmail com>]

Greetings from vishnu (@dH4wk)

1. Vulnerable Product Version

   - ZTE AC3633R (MTS Ultra Wifi Modem)

2. Vulnerability Information

 (A) Authentication Bypass
     Impact: Attacker gains administrative access
     Remotely Exploitable: UNKNOWN
     Locally Exploitable: YES

 (B) Device crash which results in reboot
     Impact: Denial of service, The crash may lead to RCE locally thus
attaining root privilege on the   device
     Remotely Exploitable: UNKNOWN
     Locally Exploitable: YES

3. Vulnerability Description

  (A) The administrative authentication mechanism of the modem can be
bypassed by feeding with a string of 121 characters in length, either in
username or password field.

  (B) A crash causes the modem to restart. This is caused when either of
the password or username fields are fed with an input of  130  characters
or above.

[Note: If username is targeted for exploitation, then password field shall
be fed with minimum 6 characters (any characters) and vice versa ]

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