The most obvious way to block brute-force attacks is to simply lock out accounts after a defined number of incorrect password attempts.Īccount lockouts can last a specific duration, such as one hour, or the accounts could remain locked until manually unlocked by an administrator. To further complicate things, some tools try a different username and password on each attempt, so you cannot lock out a single account for failed password attempts. Since each request appears to come from a different IP address, you cannot block these attacks simply by blocking the IP address. Although such attacks are easy to detect, they are not so easy to prevent.įor example, many HTTP brute-force tools can relay requests through a list of open proxy servers. Hackers launch brute-force attacks using widely available tools that utilize wordlists and smart rulesets to intelligently and automatically guess user passwords. These attacks are called dictionary attacks or hybrid brute-force attacks.īrute-force attacks put user accounts at risk and flood your site with unnecessary traffic. To speed things up a bit, a brute-force attack could start with dictionary words or slightly modified dictionary words because most people will use those rather than a completely random password. If your web site requires user authentication, you are a good target for a brute-force attack.Īn attacker can always discover a password through a brute-force attack, but the downside is that it could take years to find it.ĭepending on the password’s length and complexity, there could be trillions of possible combinations.
Contributor(s): KirstenS, Paul McMillan, Raesene, Adedov, Dinis.Cruz, JoE, Daniel Waller, kingthorinĪ common threat web developers face is a password-guessing attack known as a brute force attack.Ī brute-force attack is an attempt to discover a password by systematically trying every possible combination of letters, numbers, and symbols until you discover the one correct combination that works.
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