IBM SECURITY ADVISORY First Issued: Tue Dec 24 15:16:34 CST 2024 The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/security/kernext_advisory.asc Security Bulletin: AIX is vulnerable to denial of service (CVE-2024-47102, CVE-2024-52906) =============================================================================== SUMMARY: Vulnerabilities in the AIX TCP/IP and perfstat kernel extensions may lead to a denial of service (CVE-2024-47102, CVE-2024-52906). =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2024-47102 https://www.cve.org/CVERecord?id=CVE-2024-47102 DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a vulnerability in the AIX perfstat kernel extension to cause a denial of service. CVSS Base Score: 5.5 CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2024-52906 https://www.cve.org/CVERecord?id=CVE-2024-52906 DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a vulnerability in the AIX TCP/IP kernel extension to cause a denial of service. CVSS Base Score: 5.5 CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/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 vulnerabilities in the following filesets are being addressed: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- bos.net.tcp.client_core 7.2.5.0 7.2.5.205 key_w_fs bos.perf.perfstat 7.2.5.0 7.2.5.202 key_w_fs bos.net.tcp.client_core 7.3.0.0 7.3.0.4 key_w_fs bos.perf.perfstat 7.3.0.0 7.3.0.2 key_w_fs bos.net.tcp.client_core 7.3.1.0 7.3.1.5 key_w_fs bos.perf.perfstat 7.3.1.0 7.3.1.1 key_w_fs bos.net.tcp.client_core 7.3.2.0 7.3.2.1 key_w_fs bos.perf.perfstat 7.3.2.0 7.3.2.0 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.net.tcp.client_core REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: For TCP/IP kernel extension: AIX Level APAR Availability SP KEY PRODUCT(S) ----------------------------------------------------------------- 7.2.5 IJ52366 ** SP09 key_w_apar TCPIP 7.3.0 IJ52999 ** N/A key_w_apar TCPIP 7.3.1 IJ52977 ** N/A key_w_apar TCPIP 7.3.2 IJ52421 ** SP03 key_w_apar TCPIP VIOS Level APAR Availability SP KEY PRODUCT(S) ----------------------------------------------------------------- 3.1.4 IJ52366 ** 3.1.4.50 key_w_apar TCPIP 4.1.0 IJ52421 ** 4.1.0.30 key_w_apar TCPIP For perfstat kernel extension: AIX Level APAR Availability SP KEY PRODUCT(S) ----------------------------------------------------------------- 7.2.5 IJ52533 ** SP09 key_w_apar perfstat 7.3.0 IJ53001 ** N/A key_w_apar perfstat 7.3.1 IJ52978 ** N/A key_w_apar perfstat 7.3.2 IJ52610 ** SP03 key_w_apar perfstat VIOS Level APAR Availability SP KEY PRODUCT(S) ----------------------------------------------------------------- 3.1.4 IJ52533 ** 3.1.4.50 key_w_apar perfstat 4.1.0 IJ52610 ** 4.1.0.30 key_w_apar perfstat 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. 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 https from: https://aix.software.ibm.com/aix/efixes/security/kernext_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. The fixes are cumulative and address previously issued AIX/VIOS TCP/IP and perfstat security and HIPER bulletins with respect to SP and TL. For TCP/IP kernel extension: AIX Level Interim Fix (*.Z) KEY PRODUCT(S) --------------------------------------------------------- 7.2.5.6 IJ52366s6a.241113.epkg.Z key_w_fix TCPIP 7.2.5.7 IJ52366s7a.241113.epkg.Z key_w_fix TCPIP 7.2.5.8 IJ52366s8a.241031.epkg.Z key_w_fix TCPIP 7.3.0.2 IJ52999m2a.241216.epkg.Z key_w_fix TCPIP 7.3.0.3 IJ52999m3a.241216.epkg.Z key_w_fix TCPIP 7.3.0.4 IJ52999s4a.241105.epkg.Z key_w_fix TCPIP 7.3.1.2 IJ52977s2a.241113.epkg.Z key_w_fix TCPIP 7.3.1.3 IJ52977s3a.241113.epkg.Z key_w_fix TCPIP 7.3.1.4 IJ52977s4a.241031.epkg.Z key_w_fix TCPIP 7.3.2.1 IJ52421s1a.241112.epkg.Z key_w_fix TCPIP 7.3.2.2 IJ52421s2a.241031.epkg.Z key_w_fix TCPIP Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.5.8 is AIX 7200-05-08. Please reference the Affected Products and Version section above for help with checking installed fileset levels. VIOS Level Interim Fix (*.Z) KEY PRODUCT(S) ---------------------------------------------------------- 3.1.4.21 IJ52366s6a.241113.epkg.Z key_w_fix TCPIP 3.1.4.31 IJ52366s7a.241113.epkg.Z key_w_fix TCPIP 3.1.4.41 IJ52366s8a.241031.epkg.Z key_w_fix TCPIP 4.1.0.10 IJ52421s1a.241112.epkg.Z key_w_fix TCPIP 4.1.0.21 IJ52421s2a.241031.epkg.Z key_w_fix TCPIP For perfstat kernel extension: AIX Level Interim Fix (*.Z) KEY PRODUCT(S) --------------------------------------------------------- 7.2.5.6 IJ52533m8a.241204.epkg.Z key_w_fix perfstat 7.2.5.7 IJ52533m8a.241204.epkg.Z key_w_fix perfstat 7.2.5.8 IJ52533m8a.241204.epkg.Z key_w_fix perfstat 7.3.0.2 IJ53001m2a.241216.epkg.Z key_w_fix perfstat 7.3.0.3 IJ53001m3a.241216.epkg.Z key_w_fix perfstat 7.3.0.4 IJ53001m4a.241204.epkg.Z key_w_fix perfstat 7.3.1.2 IJ52978m4a.241204.epkg.Z key_w_fix perfstat 7.3.1.3 IJ52978m4a.241204.epkg.Z key_w_fix perfstat 7.3.1.4 IJ52978m4a.241204.epkg.Z key_w_fix perfstat 7.3.2.1 IJ52610m2a.241204.epkg.Z key_w_fix perfstat 7.3.2.2 IJ52610m2a.241204.epkg.Z key_w_fix perfstat Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.5.8 is AIX 7200-05-08. Please reference the Affected Products and Version section above for help with checking installed fileset levels. VIOS Level Interim Fix (*.Z) KEY PRODUCT(S) ---------------------------------------------------------- 3.1.4.21 IJ52533m8a.241204.epkg.Z key_w_fix perfstat 3.1.4.31 IJ52533m8a.241204.epkg.Z key_w_fix perfstat 3.1.4.41 IJ52533m8a.241204.epkg.Z key_w_fix perfstat 4.1.0.10 IJ52610m2a.241204.epkg.Z key_w_fix perfstat 4.1.0.21 IJ52610m2a.241204.epkg.Z key_w_fix perfstat To extract the fixes from the tar file: tar xvf kernext_fix.tar cd kernext_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 ----------------------------------------------------------------------------------------------------- af7c837872d006b8ea612966ceac4c0fee20544f4f3640daa6d9f5f1d1e1210d IJ52366s6a.241113.epkg.Z key_w_csum 9898a5da95938058314ead239540eec8413230d9b8a6676d5d87d26780ba4d97 IJ52366s7a.241113.epkg.Z key_w_csum 7134533f629c3464e9bfc39a05ae43c95012d7ba617fe80b9f3fe3f1bf131ac9 IJ52366s8a.241031.epkg.Z key_w_csum a1cb3310289ff02b389c32df9c701608aaee0484d9f1deff5668fff18e6d24ce IJ52421s1a.241112.epkg.Z key_w_csum 8031dd9a4c00b29c0727621b295247000ac7048a70c5f0fe7045a0ff5312e2df IJ52421s2a.241031.epkg.Z key_w_csum 7d1aa358fcb28630dd272278050763f935e3967085aea581b9b626a1a1239718 IJ52533m8a.241204.epkg.Z key_w_csum 752cf070b186bf1b90068f4ef9386ed8089b1e28b1d7fbb64a44e8d6607d5eef IJ52610m2a.241204.epkg.Z key_w_csum eebd8c0eb4c3173b51b6fc00f9c26f6be22e274ff14420c175cb661ca86c99bd IJ52977s2a.241113.epkg.Z key_w_csum 3383c97e502f885a0e1fc5f6221e76cce035102b7fe1f342762e8b01829fa879 IJ52977s3a.241113.epkg.Z key_w_csum 3639c5e334eb6b08eedb7b87369692d7b29c79034aa2226adf667d65a5e34e48 IJ52977s4a.241031.epkg.Z key_w_csum 1194b0753f2328a26e7149cce86bc02f30794aada0174ce07c44d2b84658ae25 IJ52978m4a.241204.epkg.Z key_w_csum 3e69107d5dd5162f30f4fc822d12a4c19930a10fdbd1a716ed58e9f4bb4497ca IJ52999m2a.241216.epkg.Z key_w_csum d36fc1e5092027d999cf9d9fe856dd7bd8eb6f2749efb3330cb9d51ce5db9fb5 IJ52999m3a.241216.epkg.Z key_w_csum e85d7928deb5dd1ad90deff136951dbfe2465a1685cc418f3b98f5730227bc44 IJ52999s4a.241105.epkg.Z key_w_csum d148305cdfa22e4d184fc347a61718bd31735151ca2ce55b887bdf63bbd521c8 IJ53001m2a.241216.epkg.Z key_w_csum cf1e07e30d2479450ca9288de948fb36dd4307125fd317fc94df0c6e86d3dfe4 IJ53001m3a.241216.epkg.Z key_w_csum 2e43599348ec4e5303f40d5eb1d70057f7cd000ad64912a77a6d8822fdd8577d IJ53001m4a.241204.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/kernext_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 and 7.3 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: 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/kernext_advisory.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 denial of service (CVE-2024-47102, CVE-2024-52906) https://www.ibm.com/support/pages/node/7179826 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Tue Dec 24 15:16:34 CST 2024 =============================================================================== *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.