ProFTPD before 1.3.5rc1, when using the UserOwner directive, allows local users to modify the ownership of arbitrary files via a race condition and a symlink attack on the (1) MKD or (2) XMKD commands.
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[oss-security] 20130107 Re: CVE Request -- proFTPD (X < 1.3.5.rc1): Symlink race condition when applying UserOwner to a newly (ProFTPD) created directory