Status: CLOSED DUPLICATE of bug 59810
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: shadow-utils
Version: 8.0
Hardware: i386
OS: Linux
Target Milestone: ---
Assignee: Nalin Dahyabhai
QA Contact: David Lawrence
Depends On:
TreeView+ depends on / blocked
Reported: 2002-11-06 05:40 UTC by Jan Martinek
Modified: 2007-04-18 16:48 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2006-02-21 18:50:05 UTC

Attachments (Terms of Use)

Description Jan Martinek 2002-11-06 05:40:02 UTC
Description of Problem:

When a new user account is created by using useradd command,
a new empty mailbox is created in /var/spool/mail/newuser
with these permissions:
-rw-rw----   newuser  newgroup 
But if two (or more) users have the same GID, they can read
(and modify) each others mail. 

Version-Release number of selected component (if applicable):

This is what I found in changelog of shadow-utils:
It probably has something to do with the problem mentioned

* Wed May 23 2001 Bernhard Rosenkraenzer <> 20000902-1
  - Create an empty mailspool when creating a user so non-setuid/non-setgid
    MDAs (postfix+procmail) can deliver mail (#41811)

How Reproducible:

every time

Steps to Reproduce:
1. useradd -g users newuser1
2. useradd -g users newuser2
3. Now the newuser1 and newuser2 can read and modify each others mail

Actual Results:
see above

Expected Results:
Even if this is done deliberately, I would expect useradd command
to WARN about this potential security flaw.

Additional Information:

Comment 1 Mark J. Cox 2003-02-11 13:28:39 UTC

*** This bug has been marked as a duplicate of 59810 ***

Comment 2 Red Hat Bugzilla 2006-02-21 18:50:05 UTC
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.

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