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Category:   Application (Generic)  >   BIND Vendors:   ISC (Internet Software Consortium)
(Red Hat Issues Fix) BIND DNSSEC Validation Cache Failure Lets Remote Users Deny Service
SecurityTracker Alert ID:  1027322
SecurityTracker URL:  http://securitytracker.com/id/1027322
CVE Reference:   CVE-2012-3817   (Links to External Site)
Date:  Jul 31 2012
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 9.6-ESV-R1 through 9.6-ESV-R7-P1; 9.7.1 through 9.7.6-P1; 9.8.0 through 9.8.3-P1; 9.9.0 through 9.9.1-P1
Description:   A vulnerability was reported in BIND. A remote user can cause denial of service conditions.

On systems configured for DNSSEC validation, a remote user can cause the cache of failing queries to be used before fully initialized, triggering an assertion failure.

Einar Lonn of IIS.se reported this vulnerability.

Impact:   A remote user can cause the target system to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2012-1122.html

Vendor URL:  kb.isc.org/article/AA-00729 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Jul 25 2012 BIND DNSSEC Validation Cache Failure Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2012:1122-01] Important: bind97 security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: bind97 security update
Advisory ID:       RHSA-2012:1122-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1122.html
Issue date:        2012-07-31
CVE Names:         CVE-2012-3817 
=====================================================================

1. Summary:

Updated bind97 packages that fix one security issue are now available for
Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

3. Description:

The Berkeley Internet Name Domain (BIND) is an implementation of the Domain
Name System (DNS) protocols. BIND includes a DNS server (named); a resolver
library (routines for applications to use when interfacing with DNS); and
tools for verifying that the DNS server is operating correctly.

An uninitialized data structure use flaw was found in BIND when DNSSEC
validation was enabled. A remote attacker able to send a large number of
queries to a DNSSEC validating BIND resolver could use this flaw to cause
it to exit unexpectedly with an assertion failure. (CVE-2012-3817)

Users of bind97 are advised to upgrade to these updated packages, which
correct this issue. After installing the update, the BIND daemon (named)
will be restarted automatically.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

842897 - CVE-2012-3817 bind: heavy DNSSEC validation load can cause assertion failure

6. Package List:

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/bind97-9.7.0-10.P2.el5_8.2.src.rpm

i386:
bind97-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-chroot-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-utils-9.7.0-10.P2.el5_8.2.i386.rpm

x86_64:
bind97-9.7.0-10.P2.el5_8.2.x86_64.rpm
bind97-chroot-9.7.0-10.P2.el5_8.2.x86_64.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.x86_64.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.x86_64.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.x86_64.rpm
bind97-utils-9.7.0-10.P2.el5_8.2.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/bind97-9.7.0-10.P2.el5_8.2.src.rpm

i386:
bind97-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-chroot-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-utils-9.7.0-10.P2.el5_8.2.i386.rpm

ia64:
bind97-9.7.0-10.P2.el5_8.2.ia64.rpm
bind97-chroot-9.7.0-10.P2.el5_8.2.ia64.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.ia64.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.ia64.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.ia64.rpm
bind97-utils-9.7.0-10.P2.el5_8.2.ia64.rpm

ppc:
bind97-9.7.0-10.P2.el5_8.2.ppc.rpm
bind97-chroot-9.7.0-10.P2.el5_8.2.ppc.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.ppc.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.ppc64.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.ppc.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.ppc64.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.ppc.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.ppc64.rpm
bind97-utils-9.7.0-10.P2.el5_8.2.ppc.rpm

s390x:
bind97-9.7.0-10.P2.el5_8.2.s390x.rpm
bind97-chroot-9.7.0-10.P2.el5_8.2.s390x.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.s390.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.s390x.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.s390.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.s390x.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.s390.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.s390x.rpm
bind97-utils-9.7.0-10.P2.el5_8.2.s390x.rpm

x86_64:
bind97-9.7.0-10.P2.el5_8.2.x86_64.rpm
bind97-chroot-9.7.0-10.P2.el5_8.2.x86_64.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-debuginfo-9.7.0-10.P2.el5_8.2.x86_64.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-devel-9.7.0-10.P2.el5_8.2.x86_64.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.i386.rpm
bind97-libs-9.7.0-10.P2.el5_8.2.x86_64.rpm
bind97-utils-9.7.0-10.P2.el5_8.2.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2012-3817.html
https://access.redhat.com/security/updates/classification/#important
http://www.isc.org/software/bind/advisories/cve-2012-3817

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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