| Package | Affected versions | Patched versions |
|---|---|---|
| mailman | = 2.1.5 |
The 55_options_traceback.dpatch patch for mailman 2.1.5 in Ubuntu 4.10 displays a different error message depending on whether the e-mail address is subscribed to a private list, which allows remote attackers to determine the list membership for a given e-mail address.
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