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Security Bulletin: Vulnerability in the AIX trace facility (CVE-2021-29706)

Security Bulletin


Summary

There is a vulnerability in the AIX trace facility.

Vulnerability Details

CVEID:   CVE-2021-29706
DESCRIPTION:   IBM AIX could allow a non-privileged local user to exploit a vulnerability in the trace facility to expose sensitive information or cause a denial of service.
CVSS Base score: 6.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/200663 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H)

Affected Products and Versions

Affected Product(s) Version(s)
AIX 7.1

The vulnerabilities in the following filesets are being addressed:

Fileset Lower Level Upper Level
bos.mp64 7.1.5.0 7.1.5.42
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.mp64

Remediation/Fixes

A. APARS
            
IBM has assigned the following APARs to this problem:
AIX Level APAR SP
7.1.5 IJ32940 09
Subscribe to the APARs here:
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 fixes are available.
An LPAR system reboot is required to complete the iFix installation.
The AIX and VIOS fixes can be downloaded via ftp or http from:
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
7.1.5.6 IJ32940m6a.210615.epkg.Z
7.1.5.6 IJ32940m6b.210615.epkg.Z
7.1.5.7 IJ32940m7a.210615.epkg.Z
7.1.5.7 IJ32940m7b.210615.epkg.Z
7.1.5.8 IJ32940s8a.210615.epkg.Z
7.1.5.8 IJ32940s8b.210615.epkg.Z
Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.1.5.7 is AIX 7100-05-07.
NOTE: Multiple iFixes are provided for AIX 7100-05-06, 7100-05-07, and 7100-05-08.
IJ32940m6a is for AIX 7100-05-06 with bos.mp64 fileset level 7.1.5.38.
IJ32940m6b is for AIX 7100-05-06 with bos.mp64 fileset level 7.1.5.37.
IJ32940m7a is for AIX 7100-05-07 with bos.mp64 fileset level 7.1.5.40.
IJ32940m7b is for AIX 7100-05-07 with bos.mp64 fileset level 7.1.5.39.
IJ32940s8a is for AIX 7100-05-08 with bos.mp64 fileset level 7.1.5.42.
IJ32940s8b is for AIX 7100-05-08 with bos.mp64 fileset level 7.1.5.41.
Please reference the Affected Products and Version section above for help with checking installed fileset levels.
The fixes are cumulative and address previously issued AIX kernel security bulletins with respect to SP and TL, which includes:
To extract the fixes from the tar file:
tar xvf trace_fix.tar
cd trace_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
8876568f9b7655b79a03737de3a9b43de54c93dc9ff8da34d82abc28be288ce8 IJ32940m6a.210615.epkg.Z
5c56e2b9eb8338dc05ac9aefec8eaa3aaefa8be0f25a3b3171ebccd1d1f3a86b IJ32940m6b.210615.epkg.Z
1b46af7f440fb5ed0526a68a8d4ead487272893871859e8a85d852d656dcbb43 IJ32940m7a.210615.epkg.Z
13d4ca34b088f2a939461cc7b99aae70240143d1760701283428b5a36da5a5b6 IJ32940m7b.210615.epkg.Z
5650287a5fc28411b509d41ab852a2d5617ab7a9f3f23a4c07797bb717380960 IJ32940s8a.210615.epkg.Z
7408d7ff31ada51fed41de9b483522f855f160cbda816ec792ac20262644b99b IJ32940s8b.210615.epkg.Z
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:
C. FIX AND INTERIM FIX INSTALLATION
An LPAR system reboot is required to complete the iFix 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:
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

Get Notified about Future Security Bulletins

References

Off

Change History

15 Jun 2021: Initial Publication

*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.

Document Location

Worldwide

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Document Information

Modified date:
15 September 2021

UID

ibm16464369