postfix - denial of service, bounce-scanning

The postfix mail transport agent in Debian 3.0 contains two
vulnerabilities:

• 
  CAN-2003-0468: Postfix would allow an attacker to bounce-scan private
  networks or use the daemon as a DDoS tool by forcing the daemon to
  connect to an arbitrary service at an arbitrary IP address and
  either receiving a bounce message or observing queue operations to
  infer the status of the delivery attempt.
• 
  CAN-2003-0540: a malformed envelope address can 1) cause the queue
  manager to lock up until an entry is removed from the queue and 2)
  lock up the smtp listener leading to a denial of service.

For the current stable distribution (woody) these problems have been
fixed in version 1.1.11-0.woody3.

For the unstable distribution (sid) these problems will be fixed soon.

We recommend that you update your postfix package.