Fetchmail is a remote mail retrieval and forwarding utility.
A denial of service flaw was found when Fetchmail was run in multidrop mode. A malicious mail server could send a message without headers which would cause Fetchmail to crash (CVE-2005-4348). This issue did not affect the version of Fetchmail shipped with Red Hat Enterprise Linux 2.1 or 3.
A flaw was found in the way Fetchmail used TLS encryption to connect to remote hosts. Fetchmail provided no way to enforce the use of TLS encryption and would not authenticate POP3 protocol connections properly (CVE-2006-5867). This update corrects this issue by enforcing TLS encryption when the "sslproto" configuration directive is set to "tls1".
Users of Fetchmail should update to these packages, which contain backported patches to correct these issues.
Note: This update may break configurations which assumed that Fetchmail would use plain-text authentication if TLS encryption is not supported by the POP3 server even if the "sslproto" directive is set to "tls1". If you are using a custom configuration that depended on this behavior you will need to modify your configuration appropriately after installing this update.