Uočen je i ispravljen sigurnosni propust u programskom paketu bind. Zlonamjerni napadači su ga mogli iskoristiti za otkrivanje osjetljivih informacija i napad uskraćivanjem usluga (DoS).
| Paket: | BIND 9.x |
| Operacijski sustavi: | IBM AIX 5.x, IBM AIX 6.x, IBM AIX 7.x |
| Kritičnost: | 6.3 |
| Problem: | neodgovarajuće rukovanje datotekama |
| Iskorištavanje: | udaljeno |
| Posljedica: | otkrivanje osjetljivih informacija, uskraćivanje usluga (DoS) |
| Rješenje: | programska zakrpa proizvođača |
| CVE: | CVE-2012-1667 |
| Izvorni ID preporuke: | IBM SECURITY ADVISORY |
| Izvor: | IBM |
| Problem: | |
| Uočeno je da ranjivi paket na neodgovarajući način rukuje zapisima s nultom duljinom sekcije "RDATA". |
|
| Posljedica: | |
| Posljedice napada uključuju uskraćivanje usluga, korupciju podataka i pregled osjetljivih podataka. |
|
| Rješenje: | |
| Svim korisnicima se savjetuje instalacija programske zakrpe proizvođača koja otklanja opisane propuste. |
|
Izvorni tekst preporuke
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
IBM SECURITY ADVISORY
First Issued: Fri Jul 13 13:28:29 CDT 2012
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/bind9_advisory4.asc
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: Vulnerability in AIX bind
PLATFORMS: AIX 5.3, 6.1, and 7.1 releases
SOLUTION: Apply the fix as described below
THREAT: A remote attacker can cause denial of service
CVE Number: CVE-2012-1667
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION
Adding records to BIND with zero length rdata fields could
result in memory disclosure to client, data corruption
or system crash
II. CVSS
CVSS Base Score: 5
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/76034 for the
current score
CVSS Environmental Score*: Undefined
CVSS String: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
III. PLATFORM VULNERABILITY ASSESSMENT
Note: To use the following commands on VIOS you must first
execute:
oem_setup_env
To determine if your system is vulnerable, execute the following
command:
lslpp -L bos.net.tcp.client
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
------------------------------------------------
bos.net.tcp.client 5.3.12.0 5.3.12.7
bos.net.tcp.server 5.3.12.0 5.3.12.4
bos.net.tcp.client 6.1.6.0 6.1.6.19
bos.net.tcp.server 6.1.6.0 6.1.6.18
bos.net.tcp.client 6.1.7.0 6.1.7.16
bos.net.tcp.client 6.1.7.0 6.1.7.16
bos.net.tcp.client 7.1.0.0 7.1.0.20
bos.net.tcp.server 7.1.0.0 7.1.0.18
bos.net.tcp.client 7.1.1.0 7.1.1.16
bos.net.tcp.server 7.1.1.0 7.1.1.16
IV. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
---------------------------------------------------
5.3.12 IV22625 1/04/23 sp7
6.1.6 IV22554 12/12/12 sp10
6.1.7 IV22555 12/12/12 sp6
7.1.0 IV22556 12/12/12 sp8
7.1.1 IV22557 12/12/12 sp6
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IV22625
http://www.ibm.com/support/docview.wss?uid=isg1IV22554
http://www.ibm.com/support/docview.wss?uid=isg1IV22555
http://www.ibm.com/support/docview.wss?uid=isg1IV22556
http://www.ibm.com/support/docview.wss?uid=isg1IV22557
By subscribing, you will receive periodic email alerting you
to the status of the APAR, and a link to download the fix once
it becomes available.
B. FIXES
Fixes are available. The fixes can be downloaded via ftp
from:
ftp://aix.software.ibm.com/aix/efixes/security/bind9_fix4.tar
The link above is to a tar file containing this signed
advisory, fix packages, and PGP signatures for each package.
The fixes below include prerequisite checking. This will
enforce the correct mapping between the fixes and AIX
Technology Levels.
AIX Level Interim Fix (*.Z)
-------------------------------------------------------------------
5.3.12.6 IV22625m05.120713.epkg.Z
6.1.6.8 IV22554m07.120713.epkg.Z
6.1.7.4 IV22555m04.120713.epkg.Z
7.1.0.6 IV22556m05.120711.epkg.Z
7.1.1.4 IV22557m04.120713.epkg.Z
VIOS Level Interim Fix (*.Z)
-------------------------------------------------------------------
2.2.1.4-FP-25 SP-02 IV22555m04.120713.epkg.Z
To extract the fixes from the tar file:
tar xvf bind9_fix4.tar
cd bind9_fix4
Verify you have retrieved the fixes intact:
The checksums below were generated using the
"csum -h SHA1" (sha1sum) command is the followng:
csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
00ca9d1246cc1539d4fbfb7500f6318d471d4c83 IV22625m06.120713.epkg.Z
cc1e07a12b40c0b3eb47cf4913769d8f026ca2fe IV22554m07.120713.epkg.Z
c663fb1885dbe8efb4a6ccef93d4729f0dd27cb8 IV22555m04.120713.epkg.Z
4dd1fb14f39f5fe1be1eecf35af6556b2b3ea560 IV22556m05.120711.epkg.Z
2d7145be2ffdc0254d5ee16e9e45fd9aa3af9681 IV22557m04.120713.epkg.Z
To verify the sum, use the text of this advisory as input to sha1sum.
For example:
csum -h SHA1 -i Advisory.asc
sha1sum -c Advisory.asc
These sums should match exactly. The PGP signatures in the tar
file and on this advisory can also be used to verify the
integrity of the fixes. If the sums or signatures cannot be
confirmed, contact IBM AIX Security at
Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite. and describe the discrepancy.
C. FIX AND INTERIM FIX INSTALLATION
IMPORTANT: If possible, it is recommended that a mksysb backup
of the system be created. Verify it is both bootable and
readable before proceeding.
To preview a fix installation:
installp -a -d fix_name -p all # where fix_name is the name of the
# fix package being previewed.
To install a fix package:
installp -a -d fix_name -X all # where fix_name is the name of the
# fix package being installed.
Interim fixes have had limited functional and regression
testing but not the full regression testing that takes place
for Service Packs; however, IBM does fully support them.
Interim fix management documentation can be found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview an interim fix installation:
emgr -e ipkg_name -p # where ipkg_name is the name of the
# interim fix package being previewed.
To install an interim fix package:
emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.
V. WORKAROUNDS
None
VI. OBTAINING FIXES
AIX security fixes can be downloaded from:
ftp://aix.software.ibm.com/aix/efixes/security
AIX fixes can be downloaded from:
http://www.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix
NOTE: Affected customers are urged to upgrade to the latest
applicable Technology Level and Service Pack.
VII. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
Comments regarding the content of this announcement can be
directed to:
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To request the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:
A. Send an email with "get key" in the subject line to:
Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.
B. Download the key from a PGP Public Key Server. The key ID is:
0x28BFAA12
Please contact your local IBM AIX support center for any
assistance.
eServer is a trademark of International Business Machines
Corporation. IBM, AIX and pSeries are registered trademarks of
International Business Machines Corporation. All other trademarks
are property of their respective holders.
VIII. REFERENCES:
Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2
X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/76034
CVE-2012-1667: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1667
*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the
impact of this vulnerability in their environments by accessing the links
in the Reference section of this Flash.
Note: According to the Forum of Incident Response and Security Teams
(FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry
open standard designed to convey vulnerability severity and help to
determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES
"AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE
RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY
VULNERABILITY.
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