IBM SECURITY ADVISORY First Issued: Tue Jul 16 15:22:01 CDT 2024 The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/security/openssl_advisory41.asc Security Bulletin: AIX is vulnerable to a denial of service (CVE-2024-2511, CVE-2024-0727) due to OpenSSL =============================================================================== SUMMARY: Vulnerabilities in OpenSSL could allow a remote attacker to cause a denial of service (CVE-2024-2511, CVE-2024-0727). OpenSSL is used by AIX as part of AIX's secure network communications. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2024-2511 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-2511 DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by improper server configuration validation. By using a specially crafted server configuration, a remote attacker could exploit this vulnerability to cause unbounded memory growth, and results in a denial of service condition. CVSS Base Score: 3.7 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/287215 for the current score CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L) CVEID: CVE-2024-0727 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-0727 DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by improper input validation. By persuading a victim to open a specially crafted PKCS12 file, a remote attacker could exploit this vulnerability to cause the application to crash. CVSS Base Score: 3.1 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/280532 for the current score CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.0/AV:N/AC:H/PR:N/UI:R/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 1.1.1.0 1.1.1.2200 key_w_fs openssl.base 1.1.2.0 1.1.2.2200 key_w_fs openssl.base 3.0.5.101 3.0.10.1002 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. Customers are advised to upgrade to OpenSSL 1.1.1 or 3.0 version. B. Latest level of OpenSSL fileset is available from the web download site: https://www.ibm.com/resources/mrs/assets?source=aixbp&S_PKG=openssl 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: FIXES IBM strongly recommends addressing the vulnerability now. A fix is available, and it can be downloaded from: https://www.ibm.com/resources/mrs/assets?source=aixbp&S_PKG=openssl To extract the fixes from the tar file: For OpenSSL 3.0: zcat openssl-3.0.13.1000.tar.Z | tar xvf - For OpenSSL 1.1.1 with no weak ciphers support: zcat openssl-1.1.2.2400.tar.Z | tar xvf - For OpenSSL 1.1.1 with all ciphers support: zcat openssl-1.1.1.2400.tar.Z | tar xvf - IMPORTANT: If possible, it is recommended that a mksysb backup of the system be created. Verify it is both bootable and readable before proceeding. Note that all the previously reported security vulnerability fixes are also included in above mentioned fileset level. Please refer to the readme file (provided along with the fileset) for the complete list of vulnerabilities fixed. To preview the fix installation: installp -apYd . openssl To install the fix package: installp -aXYd . openssl 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_advisory41.asc.sig 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_advisory41.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 a denial of service (CVE-2024-2511, CVE-2024-0727) due to OpenSSL https://www.ibm.com/support/pages/node/7160457 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Tue Jul 16 15:22:01 CDT 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.