IBM SECURITY ADVISORY First Issued: Wed Jun 4 08:36:14 CDT 2025 The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/security/libxml2_advisory8.asc Security Bulletin: Multiple vulnerabilities in libxml2 affect AIX =============================================================================== SUMMARY: Vulnerabilities in libxml2 could allow a use-after-free (CVE-2024-56171), a NULL pointer dereference (CVE-2025-27113), a buffer overflow (CVE-2025-24928), or a heap-based buffer under-read (CVE-2025-32415). AIX uses libxml2 as part of its XML parsing functions. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2024-56171 https://www.cve.org/CVERecord?id=CVE-2024-56171 DESCRIPTION: libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a use-after-free in xmlSchemaIDCFillNodeTables and xmlSchemaBubbleIDCNodeTables in xmlschemas.c. To exploit this, a crafted XML document must be validated against an XML schema with certain identity constraints, or a crafted XML schema must be used. CVSS Base Score: 7.8 CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N) CVEID: CVE-2025-27113 https://www.cve.org/CVERecord?id=CVE-2025-27113 DESCRIPTION: libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a NULL pointer dereference in xmlPatMatch in pattern.c. CVSS Base Score: 7.5 CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2025-24928 https://www.cve.org/CVERecord?id=CVE-2025-24928 DESCRIPTION: libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a stack-based buffer overflow in xmlSnprintfElements in valid.c. To exploit this, DTD validation must occur for an untrusted document or untrusted DTD. NOTE: this is similar to CVE-2017-9047. CVSS Base Score: 7.8 CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N) CVEID: CVE-2025-32415 https://www.cve.org/CVERecord?id=CVE-2025-32415 DESCRIPTION: In libxml2 before 2.13.8 and 2.14.x before 2.14.2, xmlSchemaIDCFillNodeTables in xmlschemas.c has a heap-based buffer under-read. To exploit this, a crafted XML document must be validated against an XML schema with certain identity constraints, or a crafted XML schema must be used. CVSS Base Score: 7.5 CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 IJ54679 ** SP10 key_w_apar 7.3.1 IJ54873 ** N/A key_w_apar 7.3.2 IJ54779 ** SP04 key_w_apar 7.3.3 IJ54754 ** SP01 key_w_apar VIOS Level APAR Availability SP KEY ----------------------------------------------------- 3.1.4 IJ54679 ** 3.1.4.60 key_w_apar 4.1.0 IJ54779 ** 4.1.0.40 key_w_apar 4.1.1 IJ54754 ** 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_fix8.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 IJ54679m7a.250522.epkg.Z key_w_fix 7.2.5.8 IJ54679m9a.250522.epkg.Z key_w_fix 7.2.5.9 IJ54679m9a.250522.epkg.Z key_w_fix 7.3.1.2 IJ54873m3a.250522.epkg.Z key_w_fix 7.3.1.3 IJ54873m3a.250522.epkg.Z key_w_fix 7.3.1.4 IJ54873m4a.250522.epkg.Z key_w_fix 7.3.2.1 IJ54779m1a.250522.epkg.Z key_w_fix 7.3.2.2 IJ54779m3a.250522.epkg.Z key_w_fix 7.3.2.3 IJ54779m3a.250522.epkg.Z key_w_fix 7.3.3.0 IJ54754m0a.250522.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 IJ54679m7a.250522.epkg.Z key_w_fix 3.1.4.41 IJ54679m9a.250522.epkg.Z key_w_fix 3.1.4.50 IJ54679m9a.250522.epkg.Z key_w_fix 4.1.0.10 IJ54779m1a.250522.epkg.Z key_w_fix 4.1.0.21 IJ54779m3a.250522.epkg.Z key_w_fix 4.1.0.30 IJ54779m3a.250522.epkg.Z key_w_fix 4.1.1.0 IJ54754m0a.250522.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf libxml2_fix8.tar cd libxml2_fix8 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 ----------------------------------------------------------------------------------------------------- 643b42552a61ffa52bbe1649c26c0ae1e5f8aad1dd1f74522b4ba8ee538a8d53 IJ54679m7a.250522.epkg.Z key_w_csum f7de82cd6f8acf9162062980ae16bdd7cc9c7b1b002a5bb12cffe106de775ea5 IJ54679m9a.250522.epkg.Z key_w_csum 30a4736f9b7e6660dce4f841b44d8488c818b50825578cd5059054898ae87681 IJ54754m0a.250522.epkg.Z key_w_csum c11ed7a6059f3f4f2092768b9660ea930e7f008f83c640802b05f860c2671aa4 IJ54779m1a.250522.epkg.Z key_w_csum ddb39d3ae68422984a95472d051d331941e904c69bb062d781b581ea69de53ac IJ54779m3a.250522.epkg.Z key_w_csum 6912d5763bda3a3ae288571ce3ee11e6bbf5f15ee2f0422a13d67c4f78249cce IJ54873m3a.250522.epkg.Z key_w_csum dfd9f8eee3bd68f8ec1cc077275d54a96dad355668ef1522dd11c6f3c85665ed IJ54873m4a.250522.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_advisory8.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_advisory8.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: Multiple vulnerabilities in libxml2 affect AIX https://www.ibm.com/support/pages/node/7235623 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Wed Jun 4 08:36:14 CDT 2025 =============================================================================== *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.