IBM SECURITY ADVISORY
First Issued: Fri Apr 25 08:23:03 CDT 2025
|Updated: Mon May 5 14:46:26 CDT 2025
|Update: New iFixes provided for AIX 7.2 TL5 SP7, 7.3 TL1 SP2 and SP3,
| 7.3 TL2 SP1, and VIOS 3.1.4.31. The new iFixes include a packaging
| change to clarify that the iFixes are cumulative and address relevant,
| previously issued AIX/VIOS libxml2 security bulletins. There is no
| functional change. Both new and original iFixes address the current and
| previously issued AIX/VIOS libxml2 security bulletins.
The most recent version of this document is available here:
https://aix.software.ibm.com/aix/efixes/security/libxml2_advisory7.asc
Security Bulletin: AIX is vulnerable to a denial of service due to libxml2
(CVE-2022-49043)
===============================================================================
SUMMARY:
Vulnerability in libxml2 could allow a remote attacker to cause a denial
of service (CVE-2022-49043). AIX uses libxml2 as part of its XML parsing
functions.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2022-49043
https://www.cve.org/CVERecord?id=CVE-2022-49043
DESCRIPTION: xmlXIncludeAddNode in xinclude.c in libxml2 before 2.11.0
has a use-after-free.
CVSS Base Score: 8.1
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H)
AFFECTED PRODUCTS AND VERSIONS:
AIX 7.2, 7.3
VIOS 3.1, 4.1
The following fileset levels are vulnerable:
key_fileset = aix
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
bos.rte.control 7.2.5.0 7.2.5.204 key_w_fs
bos.rte.control 7.3.1.0 7.3.1.3 key_w_fs
bos.rte.control 7.3.2.0 7.3.2.2 key_w_fs
bos.rte.control 7.3.3.0 7.3.3.0 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.rte.control
REMEDIATION:
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR Availability SP KEY
-----------------------------------------------------
7.2.5 IJ54061 ** SP10 key_w_apar
7.3.1 IJ54257 ** N/A key_w_apar
7.3.2 IJ54258 ** SP04 key_w_apar
7.3.3 IJ54059 ** SP01 key_w_apar
VIOS Level APAR Availability SP KEY
-----------------------------------------------------
3.1.4 IJ54061 ** 3.1.4.60 key_w_apar
4.1.0 IJ54258 ** 4.1.0.40 key_w_apar
4.1.1 IJ54059 ** 4.1.1.10 key_w_apar
Subscribe to the APARs here:
https://www.ibm.com/support/pages/apar/[apar number]
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
IBM strongly recommends addressing the vulnerability now.
AIX and VIOS fixes are available. The fixes are cumulative and
address previously issued AIX/VIOS libxml2 security bulletins with
respect to SP and TL.
The AIX and VIOS fixes can be downloaded via https from:
https://aix.software.ibm.com/aix/efixes/security/libxml2_fix7.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
----------------------------------------------
| 7.2.5.7 IJ54061m7a.250505.epkg.Z key_w_fix
7.2.5.8 IJ54061s9a.250409.epkg.Z key_w_fix
7.2.5.9 IJ54061s9a.250409.epkg.Z key_w_fix
| 7.3.1.2 IJ54257m3a.250505.epkg.Z key_w_fix
| 7.3.1.3 IJ54257m3a.250505.epkg.Z key_w_fix
7.3.1.4 IJ54257s4a.250409.epkg.Z key_w_fix
| 7.3.2.1 IJ54258m1a.250505.epkg.Z key_w_fix
7.3.2.2 IJ54258s3a.250409.epkg.Z key_w_fix
7.3.2.3 IJ54258s3a.250409.epkg.Z key_w_fix
7.3.3.0 IJ54059s0a.250409.epkg.Z key_w_fix
Please note that the above table refers to AIX TL/SP level as
opposed to fileset level, i.e., 7.3.2.3 is AIX 7300-02-03.
Please reference the Affected Products and Version section above
for help with checking installed fileset levels.
VIOS Level Interim Fix (*.Z) KEY
-----------------------------------------------
| 3.1.4.31 IJ54061m7a.250505.epkg.Z key_w_fix
3.1.4.41 IJ54061s9a.250409.epkg.Z key_w_fix
3.1.4.50 IJ54061s9a.250409.epkg.Z key_w_fix
4.1.0.10 IJ54258s3a.250409.epkg.Z key_w_fix
4.1.0.21 IJ54258s3a.250409.epkg.Z key_w_fix
4.1.0.30 IJ54258s3a.250409.epkg.Z key_w_fix
4.1.1.0 IJ54059s0a.250409.epkg.Z key_w_fix
To extract the fixes from the tar file:
tar xvf libxml2_fix7.tar
cd libxml2_fix7
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
-----------------------------------------------------------------------------------------------------
56dc4e356577beca93a26e51fb4ebc7a4999c29f364379449d34b483b109c16b IJ54059s0a.250409.epkg.Z key_w_csum
235b40168e231ae14445408127f2de17bcce9acbcb089b0516b891966cf999a7 IJ54061s9a.250409.epkg.Z key_w_csum
54d57bc8ab645dd3aac686b732ca410bffafe7cbc867c5e7e1eb2d1ccefe80cd IJ54257s4a.250409.epkg.Z key_w_csum
0aab6c40bd3d42b53c81a58039836eae1d68fbd64c06a7a25df33221647a5171 IJ54258s3a.250409.epkg.Z key_w_csum
| 973d0a7ee66e88bdb267cb75e5074ba28bf95669c72eb6f4c29d3a61bc7a6402 IJ54061m7a.250505.epkg.Z key_w_csum
| 17b91cff749cc4b03245209a81c6c25a9b94b862e4aaf5289d3c66ff661616c1 IJ54257m3a.250505.epkg.Z key_w_csum
| c5bd7e29697c4e52a02cff54493f3d28288b2ecd268ecf4ac60165239987f779 IJ54258m1a.250505.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:
https://aix.software.ibm.com/aix/efixes/security/libxml2_advisory7.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:
https://www.ibm.com/support/pages/managing-interim-fixes-aix
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
Contact IBM Support for questions related to this announcement:
https://ibm.com/support/
For information on how to securely verify AIX security bulletins and fixes:
https://www.ibm.com/support/pages/node/6985269
To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:
Download the key from our web page:
https://aix.software.ibm.com/aix/efixes/security/systems_p_os_aix_security_pubkey.txt
To verify the AIX/VIOS security bulletin:
Published advisory OpenSSL signature file location:
https://aix.software.ibm.com/aix/efixes/security/libxml2_advisory7.asc.sig
openssl dgst -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]
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: AIX is vulnerable to a denial of service due to libxml2
(CVE-2022-49043)
https://www.ibm.com/support/pages/node/7231815
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Fri Apr 25 08:23:03 CDT 2025
| Updated: Mon May 5 14:46:26 CDT 2025
| Update: New iFixes provided for AIX 7.2 TL5 SP7, 7.3 TL1 SP2 and SP3,
| 7.3 TL2 SP1, and VIOS 3.1.4.31. The new iFixes include a packaging
| change to clarify that the iFixes are cumulative and address relevant,
| previously issued AIX/VIOS libxml2 security bulletins. There is no
| functional change. Both new and original iFixes address the current
| and previously issued AIX/VIOS libxml2 security bulletins.
===============================================================================
*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.