[Bug 1721746] [NEW] [If member-email known] Malformed "From:" header accepted -> anyone can post to list.
*** This bug is a security vulnerability ***
Private security bug reported:
Hello,
because we got some spam from outside, but with email-adress of a list-
member lately, we found after an investigation that the E-Mail Header
From: "memberuseremail@"
** Information type changed from Private Security to Public -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/1721746 Title: [If member-email known] Malformed "From:" header accepted -> anyone can post to list. To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/1721746/+subscriptions
This is not a security issue in Mailman. Yes it is possible to spoof a list member's address in various headers to cause a post to be accepted by a list, but there's nothing Mailman or any list management software can do about that short of moderating all members. Also, see <https://mail.python.org/pipermail/mailman- users/2017-October/082558.html>, https://wiki.list.org/x/4030556 and the "How to post to the announcement list:" section at https://wiki.list.org/x/4030685. ** Changed in: mailman Status: New => Invalid -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/1721746 Title: [If member-email known] Malformed "From:" header accepted -> anyone can post to list. To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/1721746/+subscriptions
participants (2)
-
Mark Sapiro -
René Freund