The address parser code in Postfix 1.1.12 and earlier allows remote
attackers to cause a denial of service (lock) via (1) a malformed
envelope address to a local host that would generate a bounce and
contains the ".!" string in the MAIL FROM or Errors-To headers, which
causes nqmgr to lock up, or (2) via a valid MAIL FROM with a RCPT TO
containing a ".!" string, which causes an instance of the SMTP
listener to lock up.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
BUGTRAQ:20030804 Postfix 1.1.12 remote DoS / Postfix 1.1.11 bounce scanning
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