Details on vulnerabilities in the websites of Sun Microsystems, MySQL's parent company, were also released by the same group of hackers.
MySQL, which offers open-source database software and services for enterprises, is a leading provider of tools for small and midsize businesses. In an ironic twist, the attackers used a database-borne tactic -- SQL injection -- to reveal elements of the database company's own database of users and employees, including email addresses and passwords.
The SQL injection attack was initially found by "TinKode" and "Ne0h" of Slacker.Ro, according to a posting of some of the stolen data on pastebin.com. The data was subsequently published by "Jackh4x0r."
Among the published data are tables with customer and partner information as well as internal network details. Hashes from the database -- some already broken -- also were posted.
"It does not appear to be a vulnerability in the MySQL software, but rather flaws in the implementation of their websites," said Chester Wisniewski, senior security adviser at Sophos, in a blog about the breach.
A posting on XSSed.com also gives details on a cross-site scripting (XSS) vulnerability affecting MySQL.com since early January that reportedly still has not been repaired.
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