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Home » Hacking News » Hewlett Packard SSRT2316: DNS security vulnerability

Hewlett Packard SSRT2316: DNS security vulnerability

by Nikola Strahija on September 2nd, 2003 A security vulnerability has been found in DNS resolver libraries. This vulnerability could be exploited by an attacker to issue buffer overflow attacks.


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**REVISED 15**
Source: HEWLETT-PACKARD COMPANY
SECURITY BULLETIN: HPSBUX0208-209
Originally issued: 12 August 2002
Last revised: 02 September 2003
SSRT2316 Potential Security Vulnerability in DNS
and resolver lib's (rev.15)
-----------------------------------------------------------------

NOTICE: There are no restrictions for distribution of this
Bulletin provided that it remains complete and intact.

The information in the following Security Bulletin should be
acted upon as soon as possible. Hewlett-Packard Company will
not be liable for any consequences to any customer resulting
from customer's failure to fully implement instructions in this
Security Bulletin as soon as possible.

-----------------------------------------------------------------

PROBLEM: Potential buffer overflows in DNS resolver libraries.

PLATFORM: HP-UX releases B.10.10, B.10.20, B.10.24 (VVOS),
B.11.00, B.11.04 (VVOS), B.11.11 and B.11.22.

IMPACT: Potential unauthorized access, denial of service.

**REVISED 15**
SOLUTION: Until a product upgrade is available, download and
install appropriate preliminary updates and the
appropriate preliminary or final patches.
The following patches are available from the itrc:
PHCO_26158 for B.10.20
PHCO_27882 for B.10.24 (VVOS)
PHNE_27795 for B.11.00
PHNE_28449 for B.11.00
PHNE_27881 for B.11.04 (VVOS)
--> PHNE_29634 for B.11.04 (VVOS)
PHNE_27796 for B.11.11
PHNE_28450 for B.11.11
PHNE_28490 for B.11.22


MANUAL ACTIONS: Yes - NonUpdate
Install the applicable upgrades and patches
listed in the "Recommended solutions"
section (below).

AVAILABILITY: The depots are available now.
BIND9.2.0 is available now. (for B.11.11)
BIND-920 is available now. (for B.11.00)
BIND812 is available now. (for B.11.00)
The preliminary patches (depot files) are
available only from the ftp site (below) at
this time.
The following are available from the itrc:
PHCO_26158 for B.10.20
PHCO_27882 for B.10.24 (VVOS)
PHNE_27795 for B.11.00
PHNE_28449 for B.11.00
PHNE_27881 for B.11.04 (VVOS)
--> PHNE_29634 for B.11.04 (VVOS)
PHNE_27796 for B.11.11
PHNE_28450 for B.11.11
PHNE_28490 for B.11.22
This bulletin will be updated when a
product upgrade is available. This bulletin
will also be updated when solutions for
other vulnerable products are available.

CHANGE SUMMARY: Rev.01 - Added Bind-8.1.2. and libnss_dns
information.
Rev.02 - A patch was incorrectly listed,
PHNE_27647.depot is the correct number.
New version available,
BIND920ver3.depot.
Rev.03 - Added Bind-4.9.7 info. for B.11.00.
Rev.04 - Added Bind-4.9.7 info. for B.10.20.
Rev.05 - Added libc information for B.10.20.
Rev.06 - Corrected "strings" to "strings -a"
Rev.07 - Added B.11.04 and B.10.24 info.
Rev.08 - BIND9.2.0 version 11.11.2.0.200209.
Updated to latest patches.
Added B.10.10 information.
Rev.09 - BIND812 version B.11.00.01.004.
BIND-920 version B.11.00.01.001.
Added PHNE_27796 for B.11.11.
Removed PHNE_27647.depot for B.11.11.
Clarified 10.10 information.
Added CERT VU#738331 information.
Rev.10 - Added PHNE_27795 for B.11.00.
Removed PHNE_27646.depot for B.11.00.
Added PHNE_28450 for B.11.11.
Removed PHNE_27794.depot for B.11.11.
Added note that both client and server
systems are affected.
Rev.11 - Clarified that BIND9.2.0 version
11.11.01.002 is subsequent to
11.11.2.0.200209.
Added CERT VU#852283 and VU#229595
Added discussion of vulnerable
B.11.00 and B.11.11 versions.
Added CAUTION note about switching
between web upgrade and base os
versions of bind.
Added AFFECTED VERSIONS section.
Added B.11.22 information.
Rev.12 - Added PHNE_27881 for B.11.04.
Added PHCO_26158 for B.10.20.
Rev.13 - Added PHNE_28490 for B.11.22.
Rev.14 - Added PHNE_28449 for B.11.00.
Rev.15 - Added PHNE_29634 for B.11.04.
Removed PHNE_28415 for B.11.04.
-----------------------------------------------------------------
A. Background

CERT advisory CA-2002-19, CERT VU#738331, CERT VU#852283, and
CERT VU#229595 report vulnerabilities which may affect
products on HP-UX and VVOS.

Note: These fixes should be applied to all systems using
DNS, including those systems with client programs only.

Notes on Bind Versions (B.11.00 and B.11.11)
=============================================

Bind is available on B.11.00 and B.11.11 as part of
the base operating system and as a web upgrade.
Both versions (base os and web upgrade) may be
installed on a system simultaneously. Only one
version can be active. The active version can
be changed via a script.

The base os versions are updated via patches. The
web upgrade versions are updated by installing a
later web upgrade. The web upgrade versions are
not patched.

If a web upgrade version is active it is not possible
to patch the base os version. It is necessary to
switch to the base os version with the following
command before applying the patch:

/usr/bin/enable_inet -r bind

If you are running a web upgrade version and do not
intend to re-enable the base os version, it is not
necessary to patch the base os version. However,
since the base os version can be re-enabled with
the script, you may want to patch the base os version
even though it is not active. Similarly, if you have
installed a web upgrade version and have switched
back to the base os version, you may want to update
to the latest web upgrade version or use swremove(1)
to remove the web upgrade version entirely.

Identifying the Active Version (B.11.00/B.11.11)
================================================

Execute the following command:

what /usr/sbin/named | grep named

The bind version will be on the named line.
For example:

named 9.2.0 Thu Jul 18 11:58:39 GMT 2002


Identifying the Web Upgrade Version (B.11.00/B.11.11)
=====================================================

If the file /usr/contrib/bind/usr/sbin/named exists,
execute the following:

what /usr/contrib/bind/usr/sbin/named | grep named

The bind version will be on the named line.

AFFECTED VERSIONS

The following is a list by HP-UX revision of
affected filesets and the fileset revision or
patch containing the fix. To determine if a
system has an affected version, search the
output of "swlist -a revision -l fileset"
for an affected fileset, then determine if
a fixed revision or the applicable patch is
installed.

HP-UX B.11.22
=============
InternetSrvcs.INETSVCS2-RUN
fix: PHNE_28490 or subsequent

NFS.NFS-SHLIBS
NFS.NFS-64SLIB
fix: PHNE_27842.depot

HP-UX B.11.11
=============
BINDv913.INETSVCS-BIND
fix: must upgrade

bind.INETSVCS-RUN
fix: must upgrade

BINDv920.INETSVCS-BIND
fix: revision B.11.11.01.002 or subsequent

InternetSrvcs.INETSVCS-RUN
fix: PHNE_28450 or subsequent

NFS.NFS-SHLIBS
NFS.NFS-64SLIB
fix: PHNE_27796 or subsequent

**REVISED 15**
HP-UX B.11.04
=============
InternetSrvcs.INETSVCS-RUN
--> fix: PHNE_29634 or subsequent

NFS.NFS-64SLIB
NFS.NFS-SHLIBS
fix: PHNE_27881 or subsequent

HP-UX B.11.00
=============
BINDv812.INETSVCS-BIND
fix: revision B.11.00.01.004 or subsequent

BINDv920.INETSVCS-BIND
fix: revision B.11.00.01.001 or subsequent

bind.INETSVCS-RUN
fix: must upgrade

upgrade_bind812.INETSVCS-RUN
fix: must upgrade

BINDv913.INETSVCS-BIND
fix: must upgrade

InternetSrvcs.INETSVCS-RUN
fix: PHNE_28449 or subsequent

NFS.NFS-SHLIBS
NFS.NFS-64SLIB
fix: PHNE_27795 or subsequent

HP-UX B.10.24
=============
InternetSrvcs.INETSVCS-RUN
fix: PHNE_27879.depot

OS-Core.C-MIN
OS-Core.CORE-SHLIBS
ProgSupport.PROG-AUX
ProgSupport.PROG-MIN
fix: PHCO_27882 or subsequent

HP-UX B.10.20
=============
InternetSrvcs.INETSVCS-RUN
fix: PHNE_27792.depot

OS-Core.C-MIN
OS-Core.CORE-SHLIBS
ProgSupport.PROG-MIN
ProgSupport.PROG-AUX
fix: PHCO_26158 or subsequent

HP-UX B.10.10
=============
InternetSrvcs.INETSVCS-RUN
fix: PHNE_27792.depot

OS-Core.CORE-SHLIBS
fix: libc.1.1010, libc.a.1010

END AFFECTED VERSIONS

Note: The Security Patch Check tool examines patches to
determine whether a system is vulnerable. Therefore,
if the base o/s version of bind is not patched
as described in this bulletin, the Security Patch
Check tool will report that fact even if the
web upgrade version is active. The Security
Patch Check tool will not examine the web upgrade
versions of bind.

B. Recommended solution

CAUTION: If you have installed a web upgrade, the Base OS
version remains on the system. This command:
"/usr/bin/enable_inet -r bind"
restores the Base OS version. The Base OS version
cannot be patched while the web upgrade version is
enabled. After reverting to the Base OS version
you should verify that it is properly patched as
described below.

The following preliminary fixes are available:

HP-UX B.10.10
=============

PHNE_27792.depot s700_800 10.10/10.20 Bind 4.9.7 components
AND
libc.1.1010, libc.a.1010 10.10 libc files


HP-UX B.10.20
=============

PHNE_27792.depot s700_800 10.10/10.20 Bind 4.9.7 components
AND
PHCO_26158 s700_800 10.20 libc

HP-UX B.10.24
=============

PHNE_27879.depot s700_800 10.24 (VVOS) BIND 4.9.7 components
AND
PHCO_27882: s700_800 10.24 (VVOS) libc

HP-UX B.11.00 Bind 9.2.0
========================

BIND-920 version B.11.00.01.001 or subsequent
from http://software.hp.com.
AND
PHNE_27795 s700_800 11.00 libnss_dns

HP-UX B.11.00 Bind 8.1.2
========================

BIND812 version B.11.00.01.004 or subsequent
from http://software.hp.com.
AND
PHNE_27795 s700_800 11.00 libnss_dns

HP-UX B.11.00 Bind 4.9.7
========================

PHNE_28449 s700_800 11.00 Bind 4.9.7 components
AND
PHNE_27795 s700_800 11.00 libnss_dns

**REVISED 15**
HP-UX B.11.04
=============

--> PHNE_29634 s700_800 11.04 (VVOS) Bind 4.9.7 components
AND
PHNE_27881 s700_800 11.04 (VVOS) libnss_dns DNS backend

HP-UX B.11.11 Bind 9.2.0
========================
BIND9.2.0 version 11.11.2.0.200209 or subsequent
from http://software.hp.com.
Note: 11.11.01.002 is subsequent to 11.11.2.0.200209.
However, in order to install 11.11.01.002
on a system with 11.11.2.0.200209, the
"-x allow_downdate=true" option to swinstall
must be used.
AND
PHNE_27796 s700_800 11.11 libnss_dns

Note: BIND9.2.0 version 11.11.2.0.200209 also corrects
potential problems reported in CERT advisory
CA-2002-23.

HP-UX B.11.11 Bind 8.1.2
========================

PHNE_28450 s700_800 11.11 Bind-8.1.2 patch
AND
PHNE_27796 s700_800 11.11 libnss_dns

HP-UX B.11.22
=============

PHNE_28490 s700_800 11.22 Bind 9.2.0 components
AND
PHNE_27842.depot s700_800 11.22 libnss_dns DNS backend patch



Note: The files mentioned below can be downloaded from
the following site. This site is temporary and
will be removed when the fixes become available
from the itrc.

System: hprc.external.hp.com (192.170.19.51)
Login: bind
Password: bind1

FTP Access: ftp://bind:[email protected]/
or: ftp://bind:[email protected]/
file: upgrade_bind812_v4.depot.gz

Note: There is an ftp defect in IE5 that may result in
a browser hang. To work around this:
- Select Tools -> Internet Options -> Advanced
- Un-check the option: [ ] Enable folder view for FTP sites


Download and install the appropriate preliminary patch
from the ftp site listed above:

PHNE_27792.depot s700_800 10.10/10.20 Bind 4.9.7 components
Note: PHNE_27792 is also available as as site specific patch
from HP Response Centers.
PHNE_27879.depot s700_800 10.24 (VVOS) BIND 4.9.7 components
PHNE_27842.depot s700_800 11.22 libnss_dns DNS backend patch


Note: If you wish to verify the md5 sum and you do not
have a copy of md5, please refer to:
HPSBUX9408-016
Patch sums and the MD5 program
Note: Using your itrc account security bulletins can be
found here:
http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin


MD5 (PHNE_27792.depot) = 613aa5827f0b4df4f51188857b5834d0
cksum 4143672841 696320 PHNE_27792.depot

MD5 (PHNE_27879.depot) = 90a570964b5cf48dadcd427f69bfdd16
cksum 2889539873 747520 PHNE_27879.depot

MD5 (PHNE_27842.depot) = 79958aa9fdd13614c0564ef60e121ba9
cksum 73665367 266240 PHNE_27842.depot


Note: On 10.10 and 10.20 the DNS API is contained in libc.
Programs which make DNS calls and are linked with
libc.a must be relinked.
Programs which are linked with ".a" libraries
are statically linked.
Statically linked programs may be tested as follows:

strings -a suspect_program | grep "Too many addresses (%d)"

If the program contains the string it may make
DNS API calls and should be relinked with the
fixed version of libc.a.

Download libc.1.1010 and libc.a.1010 from the ftp
site mentioned above.

MD5 (libc.1.1010) = 87be3ba33250be16ad39345ed38f9875
cksum 1642516484 1716224 libc.1.1010
MD5 (libc.a.1010) = b680e1861a4b3ea4fc8fe55da63d62d2
cksum 4179986886 2280612 libc.a.1010

Install on B.10.10 as follows:


1. Go to init state 2. Copy libc.1.1010 and
libc.a.1010 to a secure directory such as /.

2. cd /usr/lib
/usr/sbin/cp libc.1 libc.1.orig
/usr/sbin/cp /libc.1.1010 libc.1
/usr/sbin/cp libc.a libc.a.orig
/usr/sbin/cp /libc.a.1010 libc.a

3. Reboot the system.

-----------------------------------------------------------------

C. To subscribe to automatically receive future NEW HP Security
Bulletins from the HP IT Resource Center via electronic
mail, do the following:

Use your browser to get to the HP IT Resource Center page
at:

http://itrc.hp.com

Use the 'Login' tab at the left side of the screen to login
using your ID and password. Use your existing login or the
"Register" button at the left to create a login, in order to
gain access to many areas of the ITRC. Remember to save the
User ID assigned to you, and your password.

In the left most frame select "Maintenance and Support".

Under the "Notifications" section (near the bottom of
the page), select "Support Information Digests".

To -subscribe- to future HP Security Bulletins or other
Technical Digests, click the check box (in the left column)
for the appropriate digest and then click the "Update
Subscriptions" button at the bottom of the page.

or

To -review- bulletins already released, select the link
(in the middle column) for the appropriate digest.

NOTE: Using your itrc account security bulletins can be
found here:
http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin


To -gain access- to the Security Patch Matrix, select
the link for "The Security Bulletins Archive". (near the
bottom of the page) Once in the archive the third link is
to the current Security Patch Matrix. Updated daily, this
matrix categorizes security patches by platform/OS release,
and by bulletin topic. Security Patch Check completely
automates the process of reviewing the patch matrix for
11.XX systems.

For information on the Security Patch Check tool, see:
http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/
displayProductInfo.pl?productNumber=B6834AA

The security patch matrix is also available via anonymous
ftp:

ftp://ftp.itrc.hp.com/export/patches/hp-ux_patch_matrix/

On the "Support Information Digest Main" page:
click on the "HP Security Bulletin Archive".

D. To report new security vulnerabilities, send email to

[email protected]

Please encrypt any exploit information using the
security-alert PGP key, available from your local key
server, or by sending a message with a -subject- (not body)
of 'get key' (no quotes) to [email protected]

----------------------------------------------------------------

(c)Copyright 2003 Hewlett-Packard Company
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
in this document is subject to change without notice.
Hewlett-Packard Company and the names of HP products referenced
herein are trademarks and/or service marks of Hewlett-Packard
Company. Other product and company names mentioned herein may be
trademarks and/or service marks of their respective owners.

________________________________________________________________

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