SecurityTracker.com
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 


Category:   Application (Generic)  >   BIND Vendors:   ISC (Internet Software Consortium)
(FreeBSD Issues Fix) BIND Generates Predictable Query IDs That May Facilitate Cache Poisoning Attacks
SecurityTracker Alert ID:  1018500
SecurityTracker URL:  http://securitytracker.com/id/1018500
CVE Reference:   CVE-2007-2926   (Links to External Site)
Date:  Aug 2 2007
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 9.0.x, 9.1.x, 9.2.0, 9.2.1, 9.2.2, 9.2.3, 9.2.4, 9.2.5, 9.2.6, 9.2.7, 9.2.8, 9.3.0, 9.3.1, 9.3.2, 9.3.3, 9.3.4, 9.4.0, 9.4.1, 9.5.0a1, 9.5.0a2, 9.5.0a3, 9.5.0a4, 9.5.0a5
Description:   A vulnerability was reported in BIND. A remote user can conduct cache poisoning attacks.

The system generates query IDs that have a 1 out of 8 chance of being guessed for half of the query IDs. A remote user may be able to exploit this to conduct cache poisoning attacks.

Only outgoing queries are affected.

Amit Klein from Trusteer (www.trusteer.com) discovered this vulnerability.

Impact:   A remote user can conduct cache poisoning attacks.
Solution:   FreeBSD has provided the following solution instructions [quoted]:

Perform one of the following:

1) Upgrade your vulnerable system to 5-STABLE, or 6-STABLE, or to the
RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the
correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 5.5, 6.1,
and 6.2 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-07:07/bind.patch
# fetch http://security.FreeBSD.org/patches/SA-07:07/bind.patch.asc

b) Execute the following commands as root:

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

The FreeBSD advisory is available at:

http://security.FreeBSD.org/advisories/FreeBSD-SA-07:07.bind.asc

Vendor URL:  www.isc.org/ (Links to External Site)
Cause:   Randomization error
Underlying OS:  UNIX (FreeBSD)
Underlying OS Comments:  5.3 and later versions

Message History:   This archive entry is a follow-up to the message listed below.
Jul 24 2007 BIND Generates Predictable Query IDs That May Facilitate Cache Poisoning Attacks



 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-07:07.bind


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

=============================================================================
FreeBSD-SA-07:07.bind                                       Security Advisory
                                                          The FreeBSD Project

Topic:          Predictable query ids in named(8)

Category:       contrib
Module:         bind
Announced:      2007-08-01
Credits:        Amit Klein
Affects:        FreeBSD 5.3 and later.
Corrected:      2007-07-25 08:23:08 UTC (RELENG_6, 6.2-STABLE)
                2007-08-01 20:44:58 UTC (RELENG_6_2, 6.2-RELEASE-p7)
                2007-08-01 20:45:49 UTC (RELENG_6_1, 6.1-RELEASE-p19)
                2007-07-25 08:24:40 UTC (RELENG_5, 5.5-STABLE)
                2007-08-01 20:48:19 UTC (RELENG_5_5, 5.5-RELEASE-p15)
CVE Name:       CVE-2007-2926

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

I.   Background

BIND 9 is an implementation of the Domain Name System (DNS) protocols.
The named(8) daemon is an Internet Domain Name Server.  DNS requests
contain a query id which is used match a DNS request with the response
and to make it harder for anybody but the DNS server which received the
request to send a valid response.

II.  Problem Description

When named(8) is operating as a recursive DNS server or sending NOTIFY
requests to slave DNS servers, named(8) uses a predictable query id.

III. Impact

An attacker who can see the query id for some request(s) sent by named(8)
is likely to be able to perform DNS cache poisoning by predicting the
query id for other request(s).

IV.  Workaround

No workaround is available.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 5-STABLE, or 6-STABLE, or to the
RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the
correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 5.5, 6.1,
and 6.2 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-07:07/bind.patch
# fetch http://security.FreeBSD.org/patches/SA-07:07/bind.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/bind
# make obj && make depend && make && make install
# cd /usr/src/usr.sbin/named
# 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/contrib/bind9/bin/named/client.c                        1.1.1.1.2.5
  src/contrib/bind9/lib/dns/dispatch.c                        1.1.1.1.2.3
  src/contrib/bind9/lib/dns/include/dns/dispatch.h            1.1.1.1.2.2
RELENG_5_5
  src/UPDATING                                            1.342.2.35.2.15
  src/sys/conf/newvers.sh                                  1.62.2.21.2.17
  src/contrib/bind9/bin/named/client.c                    1.1.1.1.2.3.2.1
  src/contrib/bind9/lib/dns/dispatch.c                    1.1.1.1.2.1.6.1
  src/contrib/bind9/lib/dns/include/dns/dispatch.h        1.1.1.1.2.1.6.1
RELENG_6
  src/contrib/bind9/bin/named/client.c                        1.1.1.2.2.3
  src/contrib/bind9/lib/dns/dispatch.c                        1.1.1.1.4.2
  src/contrib/bind9/lib/dns/include/dns/dispatch.h            1.1.1.1.4.1
RELENG_6_2
  src/UPDATING                                            1.416.2.29.2.10
  src/sys/conf/newvers.sh                                  1.69.2.13.2.10
  src/contrib/bind9/bin/named/client.c                    1.1.1.2.2.1.4.2
  src/contrib/bind9/lib/dns/dispatch.c                       1.1.1.1.10.2
  src/contrib/bind9/lib/dns/include/dns/dispatch.h           1.1.1.1.10.1
RELENG_6_1
  src/UPDATING                                            1.416.2.22.2.21
  src/sys/conf/newvers.sh                                  1.69.2.11.2.21
  src/contrib/bind9/bin/named/client.c                    1.1.1.2.2.1.2.1
  src/contrib/bind9/lib/dns/dispatch.c                        1.1.1.1.8.1
  src/contrib/bind9/lib/dns/include/dns/dispatch.h            1.1.1.1.8.1
- -------------------------------------------------------------------------

VII. References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2926
http://www.isc.org/sw/bind/bind-security.php
http://www.trusteer.com/docs/bind9dns_s.html

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-07:07.bind.asc
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (FreeBSD)

iD8DBQFGsPfzFdaIBMps37IRAgIfAJ9cO2LUUc0eb8T+6pltpha91wR2IgCeITpx
H3SHyAkPMSICqnT9nY/UBE8=
=Fop4
-----END PGP SIGNATURE-----
_______________________________________________
freebsd-security-notifications@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-security-notifications
To unsubscribe, send any mail to "freebsd-security-notifications-unsubscribe@freebsd.org"

 
 


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

This web site uses cookies for web analytics. Learn More

Copyright 2020, SecurityGlobal.net LLC