| Package | Affected versions | Patched versions |
|---|---|---|
| postfix | = 1.0.21= 1.1.11= 1.1.12= 1999-09-06= 1999-12-31= 2000-02-28= 2001-11-15 |
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.
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