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Category:   Application (E-mail Client)  >   mail (/usr/bin/mail) Vendors:   NetBSD
NetBSD mail(1) May Set Insecure File Permissions on Record File
SecurityTracker Alert ID:  1015847
SecurityTracker URL:  http://securitytracker.com/id/1015847
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Mar 30 2006
Impact:   Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in NetBSD mail(1). The record file may be created with insecure permissions.

If a target user's '.mailrc' file contains the 'set record' setting and the target user has the default umask set, the mail(1) application will create the record file with insecure permissions (0644). A local user can read the target user's record file.

Johan Veenhuizen reported this vulnerability.

Impact:   A local user can read a target user's mail record file.
Solution:   NetBSD has issued a fix.

The vendor's advisory is available at:

ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2006-007.txt.asc

Vendor URL:  www.netbsd.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  UNIX (NetBSD)

Message History:   None.


 Source Message Contents

Subject:  NetBSD Security Advisory 2006-007: mail(1) creates record file with


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		 NetBSD Security Advisory 2006-007
		 =================================

Topic:		mail(1) creates record file with insecure umask

Version:	NetBSD-current:	source prior to March 03, 2006
		NetBSD 3.0	affected
		NetBSD 2.1:	affected
		NetBSD 2.0.*:	affected
		NetBSD 2.0:	affected
		NetBSD 1.6.*:	affected
		NetBSD 1.6:	affected

Severity:	Information disclosure

Fixed:		NetBSD-current:		March 03, 2006
		NetBSD-3-0 branch:	March 17, 2006
					   (3.0.1 will include the fix)
		NetBSD-3   branch:	March 17, 2006
		NetBSD-2-1 branch:	March 17, 2006
					   (2.1.1 will include the fix)
		NetBSD-2-0 branch:	March 17, 2006
					   (2.0.4 will include the fix)
		NetBSD-2   branch:	March 17, 2006


Abstract
========

If the "set record" setting is present in a users .mailrc, and they
have the default umask set, the record file will be created with insecure
permissions.


Technical Details
=================

When mail(1) creates the users record file it currently does so using the 
default umask of 0644. This may leave the record file of a users email
readable by other users of the system.


Solutions and Workarounds
=========================

The default NetBSD running mail configuration is not vulnerable to this
bug, since the "set record" setting is not present by default in .mailrc.

The following instructions describe how to upgrade your mail
binaries by updating your source tree and rebuilding and
installing a new version of mail.

* NetBSD-current:

	Systems running NetBSD-current dated from before 2006-03-02
	should be upgraded to NetBSD-current dated 2006-03-03 or later.

	The following file needs to be updated from the
	netbsd-current CVS branch (aka HEAD):
		usr.bin/mail/send.c

	To update from CVS, re-build, and re-install mail:
		# cd src
		# cvs update -d -P usr.bin/mail/send.c
		# cd usr.bin/mail
		# make USETOOLS=no cleandir dependall
		# make USETOOLS=no install

* NetBSD 3.*:

	Systems running NetBSD 3.* sources dated from before
	2006-03-16 should be upgraded from NetBSD 3.* sources dated
	2006-03-17 or later.

	The following file needs to be updated from the
	netbsd-3 or netbsd-3-0 CVS branch:
		usr.bin/mail/send.c

	To update from CVS, re-build, and re-install mail:

		# cd src
		# cvs update -d -P -r <branch_name> usr.bin/mail/send.c
		# cd usr.bin/mail
		# make USETOOLS=no cleandir dependall
		# make USETOOLS=no install


* NetBSD 2.*:

	Systems running NetBSD 2.* sources dated from before
	2006-03-16 should be upgraded from NetBSD 2.* sources dated
	2006-03-17 or later.

	The following file needs to be updated from the
	netbsd-2, netbsd-2-0 or netbsd-2-1 CVS branch:
		usr.bin/mail/send.c

	To update from CVS, re-build, and re-install mail:

		# cd src
		# cvs update -d -P -r <branch_name> usr.bin/mail/send.c
		# cd usr.bin/mail
		# make USETOOLS=no cleandir dependall
		# make USETOOLS=no install


Thanks To
=========

Johan Veenhuizen for reporting the bug to the NetBSD Security Officer.
Christos Zoulas for implementing the fixes in -HEAD.

Revision History
================

	2006-03-29	Initial release


More Information
================

Advisories may be updated as new information becomes available.
The most recent version of this advisory (PGP signed) can be found at 
  ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2006-007.txt.asc

Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/ and http://www.NetBSD.org/Security/.


Copyright 2006, The NetBSD Foundation, Inc.  All Rights Reserved.
Redistribution permitted only in full, unmodified form.

$NetBSD: NetBSD-SA2006-007.txt,v 1.6 2006/03/29 11:14:28 adrianp Exp $

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