CAPEC-70 - Try Common(default) Usernames and Passwords

An attacker may try certain common (default) usernames and passwords to gain access into the system and perform unauthorized actions. An attacker may try an intelligent brute force using known vendor default credentials as well as a dictionary of common usernames and passwords.

Many vendor products come preconfigured with default (and thus well-known) usernames and passwords that should be deleted prior to usage in a production environment. It is a common mistake to forget to remove these default login credentials. Another problem is that users would pick very simple (common) passwords (e.g. "secret" or "password") that make it easier for the attacker to gain access to the system compared to using a brute force attack or even a dictionary attack using a full dictionary.






  • Attack Methods 1
  • Brute Force
  • Purposes 1
  • Penetration
  • Sec Principles 1
  • Failing Securely
  • Scopes 1
  • Gain privileges / assume identity
  • Authorization
  • Access_Control
  • Confidentiality

Low level: An attacker just needs to gain access to common default usernames/passwords specific to the technologies used by the system. Additionally, a brute force attack leveraging common passwords can be easily realized if the user name is known.

The system uses one factor password based authentication.

Technology or vendor specific list of default usernames and passwords.

Try to determine what products are used in the implementation of the system. Determine if there are any default accounts associated with those products.

Delete all default account credentials that may be put in by the product vendor.

Implement a password throttling mechanism. This mechanism should take into account both the IP address and the log in name of the user.

Put together a strong password policy and make sure that all user created passwords comply with it. Alternatively automatically generate strong passwords for users.

Passwords need to be recycled to prevent aging, that is every once in a while a new password must be chosen.