Updated imap packages to fix a security issue are now available for Red Hat Enterprise Linux 3. This update has been rated as having moderate security impact by the Red Hat Security Response Team.
The imap package provides server daemons for both the IMAP (Internet Message Access Protocol) and POP (Post Office Protocol) mail access protocols. A buffer overflow flaw was discovered in the dmail and tmail mail delivery utilities shipped with imap. If either of these utilities were used as a mail delivery agent, a remote attacker could potentially use this flaw to run arbitrary code as the targeted user by sending a specially-crafted mail message to the victim. (CVE-2008-5005) Users of imap should upgrade to these updated packages, which contain a backported patch to resolve this issue.