IBM SECURITY ADVISORY First Issued: Thu Oct 5 10:44:37 CDT 2023 |Updated: Thu Nov 2 09:55:16 CDT 2023 |Update: iFixes are now available for Perl 5.28.1 and 5.34.1. | Perl version 5.28.1.7 and higher, and Perl version 5.34.1.4 and higher, | have a dependency on OpenSSL 3.0. | The iFixes are offered in lieu of updating to OpenSSL 3.0 and Perl 5.28.1.8 | and 5.34.1.4. | The iFixes may be downloaded from: | https://aix.software.ibm.com/aix/efixes/security/perl_fix7.tar The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/security/perl_advisory7.asc Security Bulletin: AIX is vulnerable to sensitive information exposure due to Perl (CVE-2023-31484 and CVE-2023-31486) =============================================================================== SUMMARY: Multiple vulnerabilities in AIX's Perl could allow an attacker to launch a man-in-the attack to obtain sensitive information or further compromise the system (CVE-2023-31484 and CVE-2023-31486). AIX uses Perl in various operating system components. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2023-31484 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-31484 DESCRIPTION: CPAN.pm is vulnerable to a man-in-the-middle attack, caused by improper validation of TLS certificates when downloading distributions over HTTPS. An attacker could exploit this vulnerability to launch a man-in-the-middle attack and gain access to the communication channel between endpoints to obtain sensitive information or further compromise the system. CVSS Base Score: 6.8 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/253974 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N) CVEID: CVE-2023-31486 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-31486 DESCRIPTION: Perl HTTP::Tiny module is vulnerable to a man-in-the-middle attack, caused by an insecure default TLS configuration. An attacker could exploit this vulnerability to launch a man-in-the-middle attack and gain access to the communication channel between endpoints to obtain sensitive information or further compromise the system. CVSS Base Score: 6.8 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/253358 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N) AFFECTED PRODUCTS AND VERSIONS: AIX 7.2, 7.3 VIOS 3.1 The following fileset levels are vulnerable: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- perl.rte 5.28.0.0 5.28.1.7 key_w_fs perl.rte 5.34.0.0 5.34.1.3 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 perl.rte REMEDIATION: A. FIXES IBM strongly recommends addressing the vulnerability now. | AIX and VIOS fileset updates are available. | The AIX and VIOS fileset update can be downloaded via https from, under 'Perl - Perl Version 5 Runtime': https://www.ibm.com/resources/mrs/assets?source=aixbp For AIX 7.2 TL5, and 7.3 TL0, and for VIOS 3.1.2, 3.1.3, and 3.1.4: perl.rte.5.28.1.8 For AIX 7.3 TL1 and above: perl.rte.5.34.1.4 | The fileset update has a dependency on OpenSSL 3.0. | Alternatively, AIX and VIOS fixes are also available. | The AIX and VIOS fixes can be downloaded via https from: | https://aix.software.ibm.com/aix/efixes/security/perl_fix7.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 Perl fileset | levels. | AIX Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY | --------------------------------------------------------------------------------------- | 7.2.5, 7.3.0 31484m6a.231020.epkg.Z perl.rte(5.28.1.5) key_w_fix | 7.3.1 31484s2a.231018.epkg.Z perl.rte(5.34.1.2) key_w_fix | VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY | --------------------------------------------------------------------------------------- | 3.1 31484m6a.231020.epkg.Z perl.rte(5.28.1.5) key_w_fix To extract the fixes from the tar file: tar xvf perl_fix7.tar cd perl_fix7 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 | ----------------------------------------------------------------------------------------------------- | f4f38ef1f7f4863dfb83486d11e41bdc774f5612476e02bbaa6580c1862b7753 31484m6a.231020.epkg.Z key_w_csum | ad883ead31399c8ffb79261ddff5dd406f597c8cb2b9add1ae0a7fef44a1016a 31484s2a.231018.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/perl_advisory7.asc.sig B. 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 the fileset installation: installp -apYd . perl To install the fileset update: installp -aXYd . perl 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: 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/perl_advisory7.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 sensitive information exposure due to Perl (CVE-2023-31484 and CVE-2023-31486) https://www.ibm.com/support/pages/node/7047272 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Thu Oct 5 10:44:37 CDT 2023 | Updated: Thu Nov 2 09:55:16 CDT 2023 | Update: iFixes are now available for Perl 5.28.1 and 5.34.1. | Perl version 5.28.1.7 and higher, and Perl version 5.34.1.4 and higher, | have a dependency on OpenSSL 3.0. | The iFixes are offered in lieu of updating to OpenSSL 3.0 and | Perl 5.28.1.8 and 5.34.1.4. | The iFixes may be downloaded from: | https://aix.software.ibm.com/aix/efixes/security/perl_fix7.tar =============================================================================== *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.