CentOS ProjectEFS_ADVISORY.ASCVulnerability in EFS affects AIX
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
18.3%
IBM SECURITY ADVISORY
First Issued: Tue Nov 16 13:44:43 CST 2021
|Updated: Fri Mar 17 11:52:34 CDT 2023
|Update: Corrected the affected upper fileset levels for AIX 7.1 TL5
| to show that SP11 is affected. Added iFix for 7.1 TL5 SP11.
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/efs_advisory.asc
https://aix.software.ibm.com/aix/efixes/security/efs_advisory.asc
ftp://aix.software.ibm.com/aix/efixes/security/efs_advisory.asc
Security Bulletin: Vulnerability in EFS affects AIX (CVE-2021-29861)
===============================================================================
SUMMARY:
There is a vulnerability in EFS that affects AIX.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2021-29861
https://vulners.com/cve/CVE-2021-29861
https://vulners.com/cve/CVE-2021-29861
DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a
vulnerability in EFS to expose sensitive information.
CVSS Base Score: 6.2
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/206085
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
AFFECTED PRODUCTS AND VERSIONS:
AIX 7.1, 7.2
VIOS 3.1
The vulnerabilities in the following filesets are being addressed:
key_fileset = aix
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
| bos.rte.security 7.1.5.0 7.1.5.39 key_w_fs
bos.rte.security 7.2.3.0 7.2.3.20 key_w_fs
bos.rte.security 7.2.4.0 7.2.4.3 key_w_fs
bos.rte.security 7.2.5.0 7.2.5.1 key_w_fs
bos.rte.security 7.2.5.100 7.2.5.100 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.rte.security
REMEDIATION:
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR Availability SP KEY
-----------------------------------------------------
| 7.1.5 IJ35780 ** SP12 key_w_apar
7.2.4 IJ35226 ** SP05 key_w_apar
7.2.5 IJ35078 ** SP03-2147 key_w_apar
VIOS Level APAR Availability SP KEY
----------------------------------------------------
3.1.0 IJ35505 ** N/A key_w_apar
3.1.1 IJ35226 ** 3.1.1.50 key_w_apar
3.1.2 IJ35211 ** 3.1.2.30 key_w_apar
3.1.3 IJ35078 ** 3.1.3.14 key_w_apar
Subscribe to the APARs here:
http://www.ibm.com/support/pages/apar/IJ35780
http://www.ibm.com/support/pages/apar/IJ35505
http://www.ibm.com/support/pages/apar/IJ35226
http://www.ibm.com/support/pages/apar/IJ35078
http://www.ibm.com/support/pages/apar/IJ35211
https://www.ibm.com/support/pages/apar/IJ35780
https://www.ibm.com/support/pages/apar/IJ35505
https://www.ibm.com/support/pages/apar/IJ35226
https://www.ibm.com/support/pages/apar/IJ35078
https://www.ibm.com/support/pages/apar/IJ35211
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.
| For bos.rte.security levels other than 7.1.5 and 7.2.5.100,
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.
The AIX and VIOS fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/security/efs_fix.tar
http://aix.software.ibm.com/aix/efixes/security/efs_fix.tar
https://aix.software.ibm.com/aix/efixes/security/efs_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 IJ35780m7a.211103.epkg.Z key_w_fix
7.1.5.8 IJ35780m8a.211103.epkg.Z key_w_fix
7.1.5.9 IJ35780m9a.211103.epkg.Z key_w_fix
| 7.1.5.10 IJ35780sAa.221206.epkg.Z key_w_fix
| 7.1.5.11 IJ35780mBa.230314.epkg.Z key_w_fix
7.2.4.2 IJ35226m2a.211103.epkg.Z key_w_fix
7.2.4.3 IJ35226m3a.211103.epkg.Z key_w_fix
7.2.4.4 IJ35226m4a.211103.epkg.Z key_w_fix
7.2.5.1 IJ35211m1a.211110.epkg.Z key_w_fix
7.2.5.2 IJ35211m2a.211103.epkg.Z key_w_fix
7.2.5.3 IJ35078s3a.211026.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
-----------------------------------------------
3.1.0.40 IJ35505m5a.211103.epkg.Z key_w_fix
3.1.0.50 IJ35505m6a.211103.epkg.Z key_w_fix
3.1.0.60 IJ35505m7a.211103.epkg.Z key_w_fix
3.1.1.21 IJ35226m2a.211103.epkg.Z key_w_fix
3.1.1.25 IJ35226m2a.211103.epkg.Z key_w_fix
3.1.1.30 IJ35226m3a.211103.epkg.Z key_w_fix
3.1.1.40 IJ35226m4a.211103.epkg.Z key_w_fix
3.1.2.10 IJ35211m1a.211110.epkg.Z key_w_fix
3.1.2.21 IJ35211m2a.211103.epkg.Z key_w_fix
3.1.3.10 IJ35078s3a.211026.epkg.Z key_w_fix
To extract the fixes from the tar file:
tar xvf efs_fix.tar
cd efs_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
-----------------------------------------------------------------------------------------------------
236f9f4f03280e83b6cc156dee97f57f1da42979dbe7334a59bb63ca2d95f65b IJ35078s3a.211026.epkg.Z key_w_csum
d41c6dae2510ad391ffc71923c258a116a3ad4caad5842e8931ef861e6d24eaf IJ35211m1a.211110.epkg.Z key_w_csum
8f31440e4a9b06e0d855f07a2c1e3dc9dd7ad797d0adae2920d86ed8195caaef IJ35211m2a.211103.epkg.Z key_w_csum
cd1335dbb51457b1e461f7791791063a1298899c78cdb79cc774fd32a2680d0b IJ35226m2a.211103.epkg.Z key_w_csum
fc03df67a0059d77364b21c6e97ac38feac0c5e12e3d47050894fc1a7ebd9110 IJ35226m3a.211103.epkg.Z key_w_csum
e9da7ea70244f5820be59d13f17cec354efc4f86818af93d8685d8ac4dbee49c IJ35226m4a.211103.epkg.Z key_w_csum
1f0dac480fea5794a3681a269356140c90bc56b49cc8537be68d30bc9126d2b1 IJ35505m5a.211103.epkg.Z key_w_csum
3d24c82dab76677575a00ea430f67877a49120758c23709d234fed7815c087db IJ35505m6a.211103.epkg.Z key_w_csum
bfe7b0dcfcd419eccc9a31b14617374036277917d0d2fa75f3208efdc4a96835 IJ35505m7a.211103.epkg.Z key_w_csum
47f4cfe646e5de7ec0c32a5bac08a72351d78a6be141b95738a56b23b03fa001 IJ35780m7a.211103.epkg.Z key_w_csum
4071590f26fcae36acaaa72d89ab29bb65995ac87ae3b0fae8828929e143dd8d IJ35780m8a.211103.epkg.Z key_w_csum
0d87647e1bdb6f0d0051016cd2cbaa0701e0c6bc877cd0f1f7956f76174f6b30 IJ35780m9a.211103.epkg.Z key_w_csum
| c6a21e0d91172c4bb90fcd3935b810062a3c3a18fea1840819d01723240908c9 IJ35780sAa.221206.epkg.Z key_w_csum
| ed8eb3540d7586693fbd737bec85879efd8f9b909589279830568fadf887326d IJ35780mBa.230314.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/efs_advisory.asc.sig
https://aix.software.ibm.com/aix/efixes/security/efs_advisory.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/efs_advisory.asc.sig
C. FIX AND INTERIM FIX INSTALLATION
| For bos.rte.security levels other than 7.1.5 and 7.2.5.100,
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 EFS affects AIX (CVE-2021-29861)
https://www.ibm.com/support/pages/node/6516786
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Tue Nov 16 13:44:43 CST 2021
| Updated: Tue Dec 6 13:12:12 CST 2022
| Update: Corrected the affected upper fileset levels for AIX 7.1 TL5
| to show that SP10 is affected. Added iFix for 7.1 TL5 SP10.
| Updated: Fri Mar 17 11:52:34 CDT 2023
| Update: Corrected the affected upper fileset levels for AIX 7.1 TL5
| to show that SP11 is affected. Added iFix for 7.1 TL5 SP11.
===============================================================================
*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
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
18.3%