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Vulnerability Note VU#184030MySQL fails to properly evaluate zero-length strings in the check_scramble_323() functionOverviewThere is a vulnerability in the password authentication mechanism of MySQL which could allow an attacker to bypass authentication by supplying a zero-length string.I. DescriptionMySQL is an open-source database system available for Microsoft Windows, Linux, and other UNIX-based operating systems. There is a vulnerability in the check_scramble_323() function that could allow an attacker to bypass authentication by supplying a "passwd_len" value of NULL. It has been reported that versions 4.1 prior to 4.1.3 and version 5.0 are affected.Note: In order to exploit this vulnerability, an attacker would have to use a modified MySQL client library.
According to the NGSSoftware Security Advisory, this vulnerability has been fixed in version 4.1.3 (Beta) and version 5.0 (Alpha).
References
This vulnerability was reported by Chris Anley of NGSSoftware. This document was written by Damon Morda.
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