IBM SECURITY ADVISORY First Issued: Mon Feb 24 15:15:11 CST 2025 The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/security/openssl_advisory44.asc Security Bulletin: AIX is vulnerable to information disclosure (CVE-2024-13176) or arbitrary code execution or a denial of service (CVE-2024-9143) due to OpenSSL =============================================================================== SUMMARY: Vulnerabilities in OpenSSL could allow an attacker to recover a private key (CVE-2024-13176) or execute arbitrary code or cause a denial of service (CVE-2024-9143). OpenSSL is used by AIX as part of AIX's secure network communications. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2024-13176 https://www.cve.org/CVERecord?id=CVE-2024-13176 DESCRIPTION: Issue summary: A timing side-channel which could potentially allow recovering the private key exists in the ECDSA signature computation. Impact summary: A timing side-channel in ECDSA signature computations could allow recovering the private key by an attacker. However, measuring the timing would require either local access to the signing application or a very fast network connection with low latency. There is a timing signal of around 300 nanoseconds when the top word of the inverted ECDSA nonce value is zero. This can happen with significant probability only for some of the supported elliptic curves. In particular the NIST P-521 curve is affected. To be able to measure this leak, the attacker process must either be located in the same physical computer or must have a very fast network connection with low latency. For that reason the severity of this vulnerability is Low. CVSS Base Score: 4.1 CVSS Vector: (CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L) CVEID: CVE-2024-9143 https://www.cve.org/CVERecord?id=CVE-2024-9143 DESCRIPTION: OpenSSL could allow a remote attacker to execute arbitrary code on the system, caused by an out-of-bounds memory read or write flaw due to the use of the low-level GF(2^m) elliptic curve APIs with untrusted explicit values for the field polynomial. By sending a specially crafted request, an attacker could exploit this vulnerability to execute arbitrary code or cause the application to crash. CVSS Base Score: 3.7 CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L) AFFECTED PRODUCTS AND VERSIONS: AIX 7.2, 7.3 VIOS 3.1, 4.1 The following fileset levels are vulnerable: key_fileset = osrcaix Fileset Lower Level Upper Level KEY ------------------------------------------------------ openssl.base 1.1.2.0 1.1.2.2401 key_w_fs openssl.base 3.0.0.0 3.0.15.1000 key_w_fs Note: A. 0.9.8, 1.0.1 OpenSSL versions are out-of-support. Support for OpenSSL 1.0.2 version ended in December 2023, and support for OpenSSL 1.1.1 version ended in December 2024. Considering long term support, customers are advised to upgrade to OpenSSL 3.0 version. To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in the AIX user's guide. Example: lslpp -L | grep -i openssl.base REMEDIATION: A. FIXES IBM strongly recommends addressing the vulnerability now. The fixes can be downloaded via https from: https://aix.software.ibm.com/aix/efixes/security/openssl_fix44.tar The links above are 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. Note that the tar file contains Interim fixes that are based on OpenSSL version, and AIX OpenSSL fixes are cumulative. If an OpenSSL fileset with VMRF higher than the affected level listed above is available from the web download site, then that fileset is the recommended remediation. You must be on the 'prereq for installation' level before applying the interim fix. This may require installing a new level(prereq version) first. Latest level of OpenSSL fileset is available from the web download site: https://www.ibm.com/resources/mrs/assets?source=aixbp&S_PKG=openssl AIX Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY --------------------------------------------------------------------------------------- 7.2, 7.3 112401sa.250204.epkg.Z openssl.base(1.1.2.2401) key_w_fix 7.2, 7.3 301510sa.250212.epkg.Z openssl.base(3.0.15.1000) key_w_fix VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY --------------------------------------------------------------------------------------- 3.1,4.1 112401sa.250204.epkg.Z openssl.base(1.1.2.2401) key_w_fix 3.1, 4.1 301510sa.250212.epkg.Z openssl.base(3.0.15.1000) key_w_fix To extract the fixes from the tar file: tar xvf openssl_fix44.tar cd openssl_fix44 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 [file]" command as the following: openssl dgst -sha256 filename KEY ----------------------------------------------------------------------------------------------------- 8201b31a20aa97c453db629a2efe53fb21af471cf3dab0c3d97559f33f00aa29 1122401sa.250204.epkg.Z key_w_csum cd969c0ef51bf54787734042b21ce0e8b390127f6f8a95aa9d841410a795e2da 301510sa.250212.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 AIX Support at https://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/openssl_advisory44.asc.sig B. FIX AND INTERIM FIX INSTALLATION 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": https://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/openssl_advisory44.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: Review this information as needed, no action required. Complete CVSS v3 Guide: https://www.first.org/cvss/user-guide On-line Calculator v3: https://www.first.org/cvss/calculator/3.0 RELATED INFORMATION: Security Bulletin: AIX is vulnerable to information disclosure (CVE-2024-13176) or arbitrary code execution or a denial of service (CVE-2024-9143) due to OpenSSL https://www.ibm.com/support/pages/node/7184055 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Mon Feb 24 15:15:11 CST 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.