CentOS ProjectPFCDD_ADVISORY.ASCThere is a vulnerability in the AIX pfcdd kernel extension for VIOS.,There is a vulnerability in the AIX pfcdd kernel extension.
4.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
0.0004 Low
EPSS
Percentile
5.1%
IBM SECURITY ADVISORY
First Issued: Fri Mar 4 09:00:01 CST 2022
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/pfcdd_advisory.asc
https://aix.software.ibm.com/aix/efixes/security/pfcdd_advisory.asc
ftp://aix.software.ibm.com/aix/efixes/security/pfcdd_advisory.asc
Security Bulletin: Vulnerability in the AIX kernel (CVE-2021-38988)
===============================================================================
SUMMARY:
There is a vulnerability in the AIX pfcdd kernel extension.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2021-38988
https://vulners.com/cve/CVE-2021-38988
https://vulners.com/cve/CVE-2021-38988
DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a
vulnerability in the AIX kernel to cause a denial of service.
CVSS Base Score: 6.2
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/212950
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
AFFECTED PRODUCTS AND VERSIONS:
AIX 7.1, 7.2, 7.3
VIOS 3.1
The vulnerabilities in the following filesets are being addressed:
key_fileset = aix
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
bos.pfcdd.rte 7.1.5.0 7.1.5.32 key_w_fs
bos.pfcdd.rte 7.2.4.0 7.2.4.0 key_w_fs
bos.pfcdd.rte 7.2.5.0 7.2.5.0 key_w_fs
bos.pfcdd.rte 7.3.0.0 7.3.0.0 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.pfcdd.rte
REMEDIATION:
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR Availability SP KEY PRODUCT(S)
----------------------------------------------------------------
7.1.5 IJ37508 ** SP10 key_w_apar base
7.2.4 IJ37504 ** SP06 key_w_apar base
7.2.5 IJ37494 ** SP04 key_w_apar base
7.3.0 IJ37403 ** SP02 key_w_apar base
VIOS Level APAR Availability SP KEY PRODUCT(S)
---------------------------------------------------------------
3.1.1 IJ37504 ** 3.1.1.60 key_w_apar base
3.1.2 IJ37779 ** 3.1.2.40 key_w_apar base
3.1.3 IJ37494 ** 3.1.3.20 key_w_apar base
Subscribe to the APARs here:
http://www.ibm.com/support/pages/apar/IJ37403
http://www.ibm.com/support/pages/apar/IJ37494
http://www.ibm.com/support/pages/apar/IJ37504
http://www.ibm.com/support/pages/apar/IJ37508
http://www.ibm.com/support/pages/apar/IJ37779
https://www.ibm.com/support/pages/apar/IJ37403
https://www.ibm.com/support/pages/apar/IJ37494
https://www.ibm.com/support/pages/apar/IJ37504
https://www.ibm.com/support/pages/apar/IJ37508
https://www.ibm.com/support/pages/apar/IJ37779
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.
An LPAR system reboot is required to complete the iFix installation,
or Live Update may be used on AIX 7.2 and 7.3 to avoid a reboot.
The AIX and VIOS fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/security/pfcdd_fix.tar
http://aix.software.ibm.com/aix/efixes/security/pfcdd_fix.tar
https://aix.software.ibm.com/aix/efixes/security/pfcdd_fix.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
----------------------------------------------
7.1.5.7 IJ37508s9a.220215.epkg.Z key_w_fix
7.1.5.8 IJ37508s9a.220215.epkg.Z key_w_fix
7.1.5.9 IJ37508s9a.220215.epkg.Z key_w_fix
7.2.4.3 IJ37504s5a.220215.epkg.Z key_w_fix
7.2.4.4 IJ37504s5a.220215.epkg.Z key_w_fix
7.2.4.5 IJ37504s5a.220215.epkg.Z key_w_fix
7.2.5.1 IJ37494s3a.220215.epkg.Z key_w_fix
7.2.5.2 IJ37494s3a.220215.epkg.Z key_w_fix
7.2.5.3 IJ37494s3a.220215.epkg.Z key_w_fix
7.3.0.1 IJ37403s1a.220215.epkg.Z key_w_fix
Please note that the above table refers to AIX TL/SP level as
opposed to fileset level, i.e., 7.2.5.2 is AIX 7200-05-02.
Please reference the Affected Products and Version section above
for help with checking installed fileset levels.
VIOS Level Interim Fix (*.Z) KEY
-----------------------------------------------
3.1.1.30 IJ37504s5a.220215.epkg.Z key_w_fix
3.1.1.40 IJ37504s5a.220215.epkg.Z key_w_fix
3.1.1.50 IJ37504s5a.220215.epkg.Z key_w_fix
3.1.2.10 IJ37494s3a.220215.epkg.Z key_w_fix
3.1.2.21 IJ37494s3a.220215.epkg.Z key_w_fix
3.1.3.10 IJ37494s3a.220215.epkg.Z key_w_fix
3.1.3.14 IJ37494s3a.220215.epkg.Z key_w_fix
To extract the fixes from the tar file:
tar xvf pfcdd_fix.tar
cd pfcdd_fix
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
-----------------------------------------------------------------------------------------------------
3b356bb54233c6ebabeacde2930b6323b8d80d0088cb445912b3b802383f3b68 IJ37403s1a.220215.epkg.Z key_w_csum
b255d5f530a7901995cb365c8e95bd064f8384eb27396877fd7defd70e87635b IJ37494s3a.220215.epkg.Z key_w_csum
30f6523fde53aa9cdedc79649efc7cf169fd4fc624ec7d8b06a868a70865ff10 IJ37504s5a.220215.epkg.Z key_w_csum
c49e1c3eb91495574a5980029a819629f178fa52f9dcaadaca20fa84fa281a8e IJ37508s9a.220215.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 -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]
openssl dgst -sha256 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file]
Published advisory OpenSSL signature file location:
http://aix.software.ibm.com/aix/efixes/security/pfcdd_advisory.asc.sig
https://aix.software.ibm.com/aix/efixes/security/pfcdd_advisory.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/pfcdd_advisory.asc.sig
C. FIX AND INTERIM FIX INSTALLATION
An LPAR system reboot is required to complete the iFix installation,
or Live Update may be used on AIX 7.2 to avoid a reboot.
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 the AIX kernel (CVE-2021-38988)
https://www.ibm.com/support/pages/node/6561281
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Fri Mar 4 09:00:01 CST 2022
===============================================================================
*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.
Related
4.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
0.0004 Low
EPSS
Percentile
5.1%