Mandriva Linux Security Advisory 2010-158 - functions/imap_general.php in SquirrelMail before 1.4.21 does not properly handle 8-bit characters in passwords, which allows remote attackers to cause a denial of service by making many IMAP login attempts with different usernames, leading to the creation of many preferences files. This update provides squirrelmail 1.4.21, which is not vulnerable to this issue.
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