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For example, Shape reports, "In one week, cybercriminals made over five million login attempts at a Fortune 100 B2C website using multiple attack groups and hundreds of thousands of proxies located throughout the world." On another occasion, "During one day, a large retailer witnessed over 10,000 login attempts using over 1,000 proxies." This implies that for every 1 million stolen credentials used by the criminals, an average of 10,000 accounts could be accessed because of user re-use of passwords.Ĭredential stuffing is not an arcane attack method - it is widely and increasingly used. Shape's figures suggest that the criminal return on credential stuffing can be anything between 0.1% and 2%. Sentry MBA provides various techniques to defeat other defenses - such as built-in optical character recognition to solve CAPTCHA challenges. Even if an attack is suspected, Sentry MBA has moved on to the next botnet IP and blocking the suspect IP has no effect. Since each IP within the botnet tries only one credential attempt at a time, there is nothing at the target end to suggest anything different to a normal user login attempt - which either succeeds or fails. Sentry MBA cycles through the botnet to probe a target website with the spilled credentials.
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![sentry mba recaptcha bypass sentry mba recaptcha bypass](https://www.outlookseries.com/A0977/Security/sentry-mba-config.png)
It is the combination of source credentials, an attack tool such as Sentry MBA, and a botnet delivery method. The term was coined by Shape Security co-founder Sumit Agarwal when he was serving as Deputy Assistant Secretary of Defense at the Pentagon. Web sites invariably have defenses that will detect repeated login attempts from the same IP address, or multiple failed attempts at the same account - and simply block them. Simple brute force testing to discover where spilled passwords may have been reused is easily defeated. "The sheer scale of the credential theft and also the prevalence of Yahoo users' accounts suggests that these stolen credentials have been benefiting cybercriminals over the past few years," suggests the Shape report ( PDF).
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Occurrences like this mean that criminals have vast troves of legitimate user credentials - and user password recycling means that many will have been used on other accounts.
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The thefts took place in 20, giving the criminals up to four years to crack weak protection. A total of 1.5 billion credentials were spilled to the Internet, protected by the weak MD5 hashing algorithm. This means that if criminals can crack stolen passwords from one account, they have legitimate credentials that have quite likely been used on other accounts.Ĭonsider the two Yahoo breaches reported in 2016.
![sentry mba recaptcha bypass sentry mba recaptcha bypass](https://cdn1.soniccircus.com/uploads/sentry-noise-gate-P0DDL-copy-800x800.jpg)
It is made possible because of the tendency for users to recycle their passwords for multiple accounts. Credential stuffing is the large scale use of automated means to test stolen passwords against other unrelated websites. Credential spilling is when those credentials are made available to other criminals. The ID is most commonly the user's email address. In 2016, 3.3 billion user credentials were spilled onto the internet, according to figures from Shape Security's just released 2017 Credential Spill Report.Ĭredential theft occurs when attackers breach a system and steal users' access credentials - usually ID and password. With a database of 1 million stolen credentials, criminals using a credential stuffing attack with a tool such as Sentry MBA could expect to compromise roughly 10,000 accounts on a targeted but uncompromised site.