[FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-06:15.ypserv

01/06/06, [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-06:15.ypserv
From: FreeBSD Security Advisories <security-advisories@freebsd.org>

Generated by MHonArc

CSIM Logo WelcomeCourses
Faculty, Student, Staff
Projects and reports
Conferences, workshop and seminars
Laboratories and reasearch facilities
Information related to CSIM
Information non-related to CSIM
Address, map, phone, etc.
Search

[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]


To: FreeBSD Security Advisories <security-advisories@freebsd.org>
Subject: [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-06:15.ypserv
From: FreeBSD Security Advisories <security-advisories@freebsd.org>
Date: Wed, 31 May 2006 22:50:41 GMT
Cc:
Delivered-to: freebsd-announce@freebsd.org
List-archive: <http://lists.freebsd.org/pipermail/freebsd-announce>
List-help: <mailto:freebsd-announce-request@freebsd.org?subject=help>
List-id: "Project Announcements \[moderated\]" <freebsd-announce.freebsd.org>
List-post: <mailto:freebsd-announce@freebsd.org>
List-subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-announce>, <mailto:freebsd-announce-request@freebsd.org?subject=subscribe>
List-unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-announce>, <mailto:freebsd-announce-request@freebsd.org?subject=unsubscribe>
Reply-to: security-advisories@freebsd.org
Sender: owner-freebsd-announce@freebsd.org

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=============================================================================
FreeBSD-SA-06:15.ypserv                                     Security Advisory
                                                          The FreeBSD Project

Topic:          Inoperative access controls in ypserv(8)

Category:       core
Module:         ypserv
Announced:      2006-05-31
Credits:        Hokan
Affects:        All FreeBSD 5.x and FreeBSD 6.x releases
Corrected:      2006-05-31 22:31:21 UTC (RELENG_6, 6.1-STABLE)
                2006-05-31 22:31:42 UTC (RELENG_6_1, 6.1-RELEASE-p1)
                2006-05-31 22:32:04 UTC (RELENG_6_0, 6.0-RELEASE-p8)
                2006-05-31 22:32:22 UTC (RELENG_5, 5.5-STABLE)
                2006-05-31 22:32:49 UTC (RELENG_5_5, 5.5-RELEASE-p1)
                2006-05-31 22:33:17 UTC (RELENG_5_4, 5.4-RELEASE-p15)
                2006-05-31 22:33:41 UTC (RELENG_5_3, 5.3-RELEASE-p30)
CVE Name:       CVE-2006-2655

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit
<URL:http://www.freebsd.org/security/>.

I.   Background

The ypserv(8) utility is a server which distributes NIS databases to client
systems within an NIS domain.

II.  Problem Description

There are two documented methods of restricting access to NIS maps through
ypserv(8): through the use of the /var/yp/securenets file, and through the
/etc/hosts.allow file.  While both mechanisms are implemented in the server,
a change in the build process caused the "securenets" access restrictions
to be inadvertantly disabled.

III. Impact

ypserv(8) will not load or process any of the networks or hosts specified in
the /var/yp/securenets file, rendering those access controls ineffective.

IV.  Workaround

One possible workaround is to use /etc/hosts.allow for access control, as
shown by examples in that file.

Another workaround is to use a firewall (e.g., ipfw(4), ipf(4), or pf(4))
to limit access to RPC functions from untrusted systems or networks, but
due to the complexities of RPC, it might be difficult to create a set of
firewall rules which accomplish this without blocking all access to the
machine in question.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 5-STABLE or 6-STABLE, or to the
RELENG_6_1, RELENG_6_0, RELENG_5_5, RELENG_5_4, or RELENG_5_3 security
branch dated after the correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 5.3, 5.4,
5.5, 6.0, and 6.1 systems.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch http://security.FreeBSD.org/patches/SA-06:15/ypserv.patch
# fetch http://security.FreeBSD.org/patches/SA-06:15/ypserv.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/usr.sbin/ypserv
# make obj && make depend && make && make install

VI.  Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.

Branch                                                           Revision
  Path
- -------------------------------------------------------------------------
RELENG_5
  src/usr.sbin/ypserv/yp_access.c                                1.22.6.1
RELENG_5_5
  src/UPDATING                                             1.342.2.35.2.1
  src/sys/conf/newvers.sh                                   1.62.2.21.2.3
  src/usr.sbin/ypserv/yp_access.c                               1.22.18.1
RELENG_5_4
  src/UPDATING                                            1.342.2.24.2.24
  src/sys/conf/newvers.sh                                  1.62.2.18.2.20
  src/usr.sbin/ypserv/yp_access.c                               1.22.10.1
RELENG_5_3
  src/UPDATING                                            1.342.2.13.2.33
  src/sys/conf/newvers.sh                                  1.62.2.15.2.35
  src/usr.sbin/ypserv/yp_access.c                                1.22.8.1
RELENG_6
  src/usr.sbin/ypserv/yp_access.c                               1.22.12.1
RELENG_6_1
  src/UPDATING                                             1.416.2.22.2.3
  src/sys/conf/newvers.sh                                   1.69.2.11.2.3
  src/usr.sbin/ypserv/yp_access.c                               1.22.16.1
RELENG_6_0
  src/UPDATING                                             1.416.2.3.2.13
  src/sys/conf/newvers.sh                                    1.69.2.8.2.9
  src/usr.sbin/ypserv/yp_access.c                               1.22.14.1
- -------------------------------------------------------------------------

VII. References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2655

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-06:15.ypserv.asc
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.3 (FreeBSD)

iD8DBQFEfhuUFdaIBMps37IRAhH5AJ9cpTLcR+aWSRPUa1zUDYThhKDqowCggYr1
4OyjFHW/C+NB9nMIX8Wf7IE=
=NNUN
-----END PGP SIGNATURE-----
_______________________________________________
freebsd-announce@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-announce
To unsubscribe, send any mail to "freebsd-announce-unsubscribe@freebsd.org"

Previous message sorted by date: [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-06:14.fpu
Next message sorted by date: FreeBSD Security Advisory FreeBSD-SA-06:16.smbfs
Previous message sorted by thread: [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-06:14.fpu
Next message by thread: FreeBSD Security Advisory FreeBSD-SA-06:16.smbfs
Main Index
Thread Index

CSIM home pageWMailAccount managementCSIM LibraryNetwork test toolsSearch CSIM directories
Contact us: Olivier Nicole CSIM    SET    AIT Last update: Jun 2006