IBM SECURITY ADVISORY First Issued: Mon Sep 11 10:43:54 CDT 2023 The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/security/openssl_advisory39.asc Security Bulletin: Multiple vulnerabilities in OpenSSL affect AIX =============================================================================== SUMMARY: There are multiple vulnerabilities in OpenSSL as used by AIX. OpenSSL is used by AIX as part of AIX's secure network communications. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2023-0464 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-0464 DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by an error related to the verification of X.509 certificate chains that include policy constraints. By creating a specially crafted certificate chain that triggers exponential use of computational resources, a remote attacker could exploit this vulnerability to cause a denial of service. CVSS Base Score: 5.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/250736 for the current score CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) CVEID: CVE-2023-2650 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2650 DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by a flaw when using OBJ_obj2txt() directly, or use any of the OpenSSL subsystems OCSP, PKCS7/SMIME, CMS, CMP/CRMF or TS with no message size limit. By sending a specially crafted request, a remote attacker could exploit this vulnerability to cause a denial of service. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/256611 for the current score CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2023-0465 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-0465 DESCRIPTION: OpenSSL could allow a remote attacker to bypass security restrictions, caused by a flaw when using a non-default option to verify certificates. By using invalid certificate policies in leaf certificates, an attacker could exploit this vulnerability to bypass policy checking. CVSS Base Score: 3.7 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/251293 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:L/A:N) CVEID: CVE-2023-0466 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-0466 DESCRIPTION: OpenSSL could allow a remote attacker to bypass security restrictions, caused by a flaw in the X509_VERIFY_PARAM_add0_policy function. By using invalid certificate policies, an attacker could exploit this vulnerability to bypass certificate verification. CVSS Base Score: 3.7 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/251307 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:L/A:N) CVEID: CVE-2023-2975 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2975 DESCRIPTION: OpenSSL could allow a remote attacker to bypass security restrictions, caused by AES-SIV cipher implementation. By sending a specially-crafted request using empty data entries as associated data, an attacker could exploit this vulnerability to bypass authentication validation. CVSS Base Score: 5.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/260817 for the current score CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) CVEID: CVE-2023-3446 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-3446 DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by a flaw when using the DH_check(), DH_check_ex() or EVP_PKEY_param_check() functions to check a DH key or DH parameters. By sending a specially crafted request using long DH keys or parameters, a remote attacker could exploit this vulnerability to cause long delays, and results in a denial of service condition. CVSS Base Score: 3.7 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/261026 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-2023-3817 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-3817 DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by a flaw when using the DH_check(), DH_check_ex() or EVP_PKEY_param_check() functions to check a DH key or DH parameters. By sending a specially crafted request, a remote attacker could exploit this vulnerability to cause long delays, and results in a denial of service condition. CVSS Base Score: 3.7 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/262046 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) AFFECTED PRODUCTS AND VERSIONS: AIX 7.2, 7.3 The following fileset levels are vulnerable: key_fileset = osrcaix Fileset Lower Level Upper Level KEY ------------------------------------------------------- openssl.base 1.0.2.500 1.0.2.2106 key_w_fs openssl.base 1.1.1.0 1.1.1.2000 key_w_fs openssl.base 1.1.2.0 1.1.2.2000 key_w_fs openssl.base 20.13.102.1000 20.16.102.2107 key_w_fs openssl.base 3.0.5.101 3.0.8.1000 key_w_fs Note: A. 0.9.8, 1.0.1 OpenSSL versions are out-of-support. Support for OpenSSL 1.0.2 version ends by 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-3.0.10.1000.tar.Z | tar xvf - For OpenSSL 1.1.1 with no weak ciphers support: zcat openssl-1.1.2.2200.tar.Z | tar xvf - For OpenSSL 1.1.1 with all ciphers support: zcat openssl-1.1.1.2200.tar.Z | tar xvf - For OpenSSL 1.0.2: zcat openssl-1.0.2.2107.tar.Z | tar xvf - For OpenSSL 1.0.2 with FIPS: zcat openssl-fips-20.16.102.2108.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_advisory39.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: ftp://ftp.software.ibm.com/systems/power/AIX/systems_p_os_aix_security_pubkey.txt 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_advisory39.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: Multiple vulnerabilities in OpenSSL affect AIX https://www.ibm.com/support/pages/node/7031625 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Mon Sep 11 10:43:54 CDT 2023 =============================================================================== *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.