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AUSCERT External Security Bulletin Redistribution
ESB-2006.0246 -- [NetBSD]
mail(1) creates record file with insecure umask
31 March 2006
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AusCERT Security Bulletin Summary
---------------------------------
Product: mail(1)
Publisher: NetBSD
Operating System: NetBSD
Impact: Access Privileged Data
Access: Existing Account
Original Bulletin:
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2006-007.txt.asc
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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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