A denial of service flaw was found in the way SquirrelMail processed random login attempts with 8-bit characters in the password. A remote attacker could use this flaw to cause the server system potentially to run out of the hard disk space via random login attempts, causing SquirrelMail temporarily to accept the login and create a preferences file for the given username. References: [1] http://www.squirrelmail.org/security/issue/2010-07-23 Upstream patch: [2] http://squirrelmail.svn.sourceforge.net/viewvc/squirrelmail/branches/SM-1_4-STABLE/squirrelmail/functions/imap_general.php?view=patch&r1=13972&r2=13971&pathrev=13972 Affected Versions: <= v1.4.20 Register Globals: Register_globals does not have to be on for this issue. Credit: Issue discovered by Mikhail Goriachev
This issue affects the versions of the squirrelmail package, as shipped with Red Hat Enterprise Linux 3, 4, and 5. This issue has been already addressed in the versions of squirrelmail package, which is currently present in Fedora -testing repository (squirrelmail-1.4.21-1.fc1{2,3}).
Statement: The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw.
squirrelmail-1.4.21-1.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report.
squirrelmail-1.4.21-1.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Red Hat Enterprise Linux 5 Via RHSA-2012:0103 https://rhn.redhat.com/errata/RHSA-2012-0103.html