6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
0.004 Low
EPSS
Percentile
73.9%
IBM SECURITY ADVISORY
First Issued: Fri Dec 18 12:48:01 CST 2020
|Updated: Tue Mar 30 09:15:02 CDT 2021
|Update: iFix now provided for AIX 7200-04-03 and VIOS 3.1.1.30.
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/bind_advisory18.asc
https://aix.software.ibm.com/aix/efixes/security/bind_advisory18.asc
ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory18.asc
Security Bulletin: Vulnerability in BIND affects AIX (CVE-2020-8622)
===============================================================================
SUMMARY:
There is a vulnerability in BIND that affects AIX.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2020-8622
https://vulners.com/cve/CVE-2020-8622
https://vulners.com/cve/CVE-2020-8622
DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by an
assertion failure when attempting to verify a truncated response to a
TSIG-signed request. By sending a specially-crafted request, a remote
authenticated attacker could exploit this vulnerability to cause the
server to exit.
CVSS Base Score: 6.5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/187060
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
AFFECTED PRODUCTS AND VERSIONS:
AIX 7.1, 7.2
VIOS 3.1
The following fileset levels are vulnerable:
key_fileset = aix
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
bos.net.tcp.client 7.1.5.0 7.1.5.36 key_w_fs
bos.net.tcp.bind_utils 7.2.3.0 7.2.3.16 key_w_fs
| bos.net.tcp.bind_utils 7.2.4.0 7.2.4.2 key_w_fs
bos.net.tcp.bind_utils 7.2.5.0 7.2.5.1 key_w_fs
To find out whether the affected filesets are installed
on your systems, refer to the lslpp command found in AIX user's guide.
Example: lslpp -L | grep -i bos.net.tcp.client
REMEDIATION:
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR Availability SP KEY
-----------------------------------------------------
7.1.5 IJ29230 ** SP08 key_w_apar
7.2.3 IJ29229 ** SP07 key_w_apar
7.2.4 IJ29231 ** SP04 key_w_apar
7.2.5 IJ29232 ** SP02 key_w_apar
VIOS Level APAR Availability SP KEY
----------------------------------------------------
3.1.0 IJ29229 ** 3.1.0.60 key_w_apar
3.1.1 IJ29231 ** 3.1.1.40 key_w_apar
3.1.2 IJ29232 ** 3.1.2.20 key_w_apar
Subscribe to the APARs here:
http://www.ibm.com/support/pages/apar/IJ29229
http://www.ibm.com/support/pages/apar/IJ29230
http://www.ibm.com/support/pages/apar/IJ29231
http://www.ibm.com/support/pages/apar/IJ29232
https://www.ibm.com/support/pages/apar/IJ29229
https://www.ibm.com/support/pages/apar/IJ29230
https://www.ibm.com/support/pages/apar/IJ29231
https://www.ibm.com/support/pages/apar/IJ29232
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
AIX and VIOS fixes are available.
The AIX and VIOS fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/security/bind_fix18.tar
http://aix.software.ibm.com/aix/efixes/security/bind_fix18.tar
https://aix.software.ibm.com/aix/efixes/security/bind_fix18.tar
The link above is to a tar file containing this signed
advisory, fix packages, and OpenSSL 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) KEY
----------------------------------------------
7.1.5.5 IJ29230m7a.201117.epkg.Z key_w_fix
7.1.5.6 IJ29230m7a.201117.epkg.Z key_w_fix
7.1.5.7 IJ29230m7a.201117.epkg.Z key_w_fix
7.2.3.3 IJ29229m5a.201117.epkg.Z key_w_fix
7.2.3.4 IJ29229m5a.201117.epkg.Z key_w_fix
7.2.3.5 IJ29229m5a.201117.epkg.Z key_w_fix
7.2.4.0 IJ29231m2a.201117.epkg.Z key_w_fix
7.2.4.1 IJ29231m2a.201117.epkg.Z key_w_fix
7.2.4.2 IJ29231m2a.201117.epkg.Z key_w_fix
| 7.2.4.3 IJ29231s3a.210314.epkg.Z key_w_fix
7.2.5.0 IJ29232s1a.201117.epkg.Z key_w_fix
7.2.5.1 IJ29232s1a.201117.epkg.Z key_w_fix
Please note that the above table refers to AIX TL/SP level as
opposed to fileset level, i.e., 7.2.3.5 is AIX 7200-03-05.
Please reference the Affected Products and Version section above
for help with checking installed fileset levels.
VIOS Level Interim Fix (*.Z) KEY
-----------------------------------------------
3.1.0.20 IJ29229m5a.201117.epkg.Z key_w_fix
3.1.0.21 IJ29229m5a.201117.epkg.Z key_w_fix
3.1.0.30 IJ29229m5a.201117.epkg.Z key_w_fix
3.1.0.40 IJ29229m5a.201117.epkg.Z key_w_fix
3.1.1.0 IJ29231m2a.201117.epkg.Z key_w_fix
3.1.1.10 IJ29231m2a.201117.epkg.Z key_w_fix
3.1.1.20 IJ29231m2a.201117.epkg.Z key_w_fix
3.1.1.21 IJ29231m2a.201117.epkg.Z key_w_fix
3.1.1.22 IJ29231m2a.201117.epkg.Z key_w_fix
3.1.1.25 IJ29231m2a.201117.epkg.Z key_w_fix
| 3.1.1.30 IJ29231s3a.210314.epkg.Z key_w_fix
3.1.2.0 IJ29232s1a.201117.epkg.Z key_w_fix
3.1.2.10 IJ29232s1a.201117.epkg.Z key_w_fix
The above fixes are cumulative and address previously issued
AIX/VIOS BIND security bulletins with respect to SP and TL.
To extract the fixes from the tar file:
tar xvf bind_fix18.tar
cd bind_fix18
Verify you have retrieved the fixes intact:
The checksums below were generated using the
"openssl dgst -sha256 [filename]" command as the following:
openssl dgst -sha256 filename KEY
-----------------------------------------------------------------------------------------------------
2277f723175f912ef8ac6d4389b1ee4ffdeafad4793df0e1c3dc018416dabc34 IJ29229m5a.201117.epkg.Z key_w_csum
49b979992aecad5cbb085e3f0ea84091205a47fdbdafc076e5353f3fbab4d565 IJ29230m7a.201117.epkg.Z key_w_csum
d907c4aea95f4de1378f9fcb89460dc11e6cda8224ee2f1071764ddf6c275d20 IJ29231m2a.201117.epkg.Z key_w_csum
| 8d9ccd298ddcbaefd4e7979d4a8af08b774836ab558c57d604481cc942a1c366 IJ29231s3a.210314.epkg.Z key_w_csum
2af0db1aebde06628627b84e976fe676e8232b70b9fca7439e62060b8c18b611 IJ29232s1a.201117.epkg.Z key_w_csum
These sums should match exactly. The OpenSSL 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 Support at
http://ibm.com/support/ and describe the discrepancy.
openssl dgst -sha1 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]
openssl dgst -sha1 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file]
Published advisory OpenSSL signature file location:
http://aix.software.ibm.com/aix/efixes/security/bind_advisory18.asc.sig
https://aix.software.ibm.com/aix/efixes/security/bind_advisory18.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/bind_advisory18.asc.sig
C. FIX AND INTERIM FIX INSTALLATION
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.
WORKAROUNDS AND MITIGATIONS:
None.
===============================================================================
CONTACT US:
Note: Keywords labeled as KEY in this document are used for parsing
purposes.
If you would like to receive AIX Security Advisories via email,
please visit "My Notifications":
http://www.ibm.com/support/mynotifications
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
Contact IBM Support for questions related to this announcement:
http://ibm.com/support/
https://ibm.com/support/
To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:
Download the key from our web page:
ftp://ftp.software.ibm.com/systems/power/AIX/systems_p_os_aix_security_pubkey.txt
Please contact your local IBM AIX support center for any
assistance.
REFERENCES:
Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide
On-line Calculator v3:
http://www.first.org/cvss/calculator/3.0
RELATED INFORMATION:
IBM Secure Engineering Web Portal
http://www.ibm.com/security/secure-engineering/bulletins.html
IBM Product Security Incident Response Blog
https://www.ibm.com/blogs/psirt/
Security Bulletin: Vulnerability in BIND affects AIX (CVE-2020-8622)
https://www.ibm.com/support/pages/node/6388720
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Fri Dec 18 12:48:01 CST 2020
| Updated: Tue Mar 30 09:15:02 CDT 2021
| Update: iFix now provided for AIX 7200-04-03 and VIOS 3.1.1.30.
===============================================================================
*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 Security Bulletin.
Disclaimer
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.
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
0.004 Low
EPSS
Percentile
73.9%