USN-405-1: fetchmail vulnerability

11 January 2007

fetchmail vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 6.10
  • Ubuntu 6.06 LTS
  • Ubuntu 5.10

Software Description


It was discovered that fetchmail did not correctly require TLS negotiation in certain situations. This would result in a user’s unencrypted password being sent across the network.

If fetchmail has been configured to use the “sslproto tls1”, “sslcertck”, or “sslfingerprint” options with a server that does not correctly support TLS negotiation, this update may cause fetchmail to (correctly) abort authentication.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 6.10
fetchmail - 6.3.4-1ubuntu4.1
Ubuntu 6.06 LTS
fetchmail - 6.3.2-2ubuntu2.1
Ubuntu 5.10
fetchmail - 6.2.5-13ubuntu3.3

To update your system, please follow these instructions:

In general, a standard system upgrade is sufficient to effect the necessary changes.