fetchmail security announcement 2005-02 (CVE-2005-3088)

Type securityvulns
Reporter Securityvulns
Modified 2005-10-28T00:00:00


fetchmail-SA-2005-02: security announcement

Topic: password exposure in fetchmailconf

Author: Matthias Andree Version: 1.02 Announced: 2005-10-21 Type: insecure creation of file Impact: passwords are written to a world-readable file Danger: medium Credits: Thomas Wolff, Miloslav Trmac for pointing out that fetchmailconf 1.43.1 was also flawed CVE Name: CVE-2005-3088 URL: http://fetchmail.berlios.de/fetchmail-SA-2005-02.txt

Affects: fetchmail version fetchmail version 6.2.5 fetchmail version 6.2.0 fetchmailconf 1.43 (shipped with 6.2.0, 6.2.5 and fetchmailconf 1.43.1 (shipped separately, now withdrawn) (other versions have not been checked but are presumed affected)

Not affected: fetchmail 6.2.9-rc6 fetchmailconf 1.43.2 (use this for fetchmail- fetchmailconf 1.49 (shipped with 6.2.9-rc6) fetchmail 6.3.0 (not released yet)

Corrected: 2005-09-28 01:14 UTC (SVN) - committed bugfix (r4351) 2005-10-21 - released fetchmailconf-1.43.2 2005-10-21 - released fetchmail 6.2.9-rc6

0. Release history

2005-10-21 1.00 - initial version (shipped with -rc6) 2005-10-21 1.01 - marked 1.43.1 vulnerable - revised section 4 - added Credits 2005-10-27 1.02 - reformatted section 0 - updated CVE Name to new naming scheme

1. Background

fetchmail is a software package to retrieve mail from remote POP2, POP3, IMAP, ETRN or ODMR servers and forward it to local SMTP, LMTP servers or message delivery agents.

fetchmail ships with a graphical, Python/Tkinter based configuration utility named "fetchmailconf" to help the user create configuration (run control) files for fetchmail.

2. Problem description and Impact

The fetchmailconf program before and excluding version 1.49 opened the run control file, wrote the configuration to it, and only then changed the mode to 0600 (rw-------). Writing the file, which usually contains passwords, before making it unreadable to other users, can expose sensitive password information.

3. Workaround

Run "umask 077", then run "fetchmailconf" from the same shell. After fetchmailconf has finished, you can restore your old umask.

4. Solution

For users of fetchmail-

Download fetchmailconf-1.43.2.gz from fetchmail's project site <http://developer.berlios.de/project/showfiles.php?group_id=1824&release_id=6617>, gunzip it, then replace your existing fetchmailconf with it.

For users of fetchmail-6.2.6 or 6.2.9 before 6.2.9-rc6:

update to the latest fetchmail-devel package, 6.2.9-rc6 on 2005-10-21. <https://developer.berlios.de/project/showfiles.php?group_id=1824>

A. References

fetchmail home page: <http://fetchmail.berlios.de/>

B. Copyright, License and Warranty

(C) Copyright 2005 by Matthias Andree, <matthias.andree@gmx.de>. Some rights reserved.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs German License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/2.0/de/ or send a letter to Creative Commons; 559 Nathan Abbott Way; Stanford, California 94305; USA.

THIS WORK IS PROVIDED FREE OF CHARGE AND WITHOUT ANY WARRANTIES. Use the information herein at your own risk.

END OF fetchmail-SA-2005-02.txt