IBM SECURITY ADVISORY First Issued: Mon Dec 11 13:23:17 CST 2023 |Updated: Fri Feb 2 13:43:05 CST 2024 |Update: New iFixes are available. The new iFixes resolve a technical issue | with print queue status. Both sets of iFixes (new and original) resolve | the security vulnerabilities described in the bulletin. The new iFixes are | only needed if you experience the technical issue described here: | https://www.ibm.com/support/pages/apar/IJ49737 The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/security/printers_advisory.asc Security Bulletin: AIX is vulnerable to privilege escalation and denial of service (CVE-2023-45166, CVE-2023-45174, CVE-2023-45170) =============================================================================== SUMMARY: A vulnerability in the AIX printers system could allow a non-privileged local user to obtain elevated privileges or cause a denial of service (CVE-2023-45166, CVE-2023-45174, CVE-2023-45170). =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2023-45166 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-45166 DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a vulnerability in the piodmgrsu command to obtain elevated privileges. CVSS Base Score: 8.4 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/267964 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVEID: CVE-2023-45174 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-45174 DESCRIPTION: IBM AIX could allow a privileged local user to exploit a vulnerability in the qdaemon command to escalate privileges or cause a denial of service. CVSS Base Score: 8.4 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/267972 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVEID: CVE-2023-45170 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-45170 DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a vulnerability in the piobe command to escalate privileges or cause a denial of service. CVSS Base Score: 8.4 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/267968 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) AFFECTED PRODUCTS AND VERSIONS: AIX 7.2, 7.3 VIOS 3.1 The vulnerabilities in the following filesets are being addressed: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- bos.rte.printers 7.2.5.0 7.2.5.101 key_w_fs printers.rte 7.2.4.0 7.2.4.0 key_w_fs bos.rte.printers 7.2.5.200 7.2.5.201 key_w_fs printers.rte 7.2.5.200 7.2.5.201 key_w_fs bos.rte.printers 7.3.0.0 7.3.0.2 key_w_fs printers.rte 7.3.0.0 7.3.0.2 key_w_fs bos.rte.printers 7.3.1.0 7.3.1.1 key_w_fs printers.rte 7.3.1.0 7.3.1.1 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.rte.printers REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ----------------------------------------------------- 7.2.5 IJ48481 ** SP07 key_w_apar 7.3.0 IJ48784 ** N/A key_w_apar 7.3.1 IJ48539 ** SP03 key_w_apar VIOS Level APAR Availability SP KEY ----------------------------------------------------- 3.1.3 IJ49461 ** N/A key_w_apar 3.1.4 IJ48481 ** 3.1.4.30 key_w_apar 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. The AIX and VIOS fixes can be downloaded via https from: https://aix.software.ibm.com/aix/efixes/security/printers_fix.tar The fixes are cumulative and address the previously issued AIX/VIOS lpd security bulletin with respect to SP and TL: https://aix.software.ibm.com/aix/efixes/security/lpd_advisory3.asc https://www.ibm.com/support/pages/node/6848309 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. AIX Level Interim Fix (*.Z) KEY ---------------------------------------------- | 7.2.5.5 IJ48481m5b.240202.epkg.Z key_w_fix | 7.2.5.6 IJ48481m6b.240130.epkg.Z key_w_fix | 7.3.0.2 IJ48784m2b.240202.epkg.Z key_w_fix | 7.3.0.3 IJ48784m3b.240202.epkg.Z key_w_fix | 7.3.0.4 IJ48784m4b.240202.epkg.Z key_w_fix | 7.3.1.1 IJ48539m1b.240202.epkg.Z key_w_fix | 7.3.1.2 IJ48539m2b.240202.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.5.6 is AIX 7200-05-06. VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- | 3.1.3.21 IJ49461m2c.240202.epkg.Z key_w_fix | 3.1.3.30 IJ49461m4b.240202.epkg.Z key_w_fix | 3.1.3.40 IJ49461m4b.240202.epkg.Z key_w_fix | 3.1.4.10 IJ48481m5b.240202.epkg.Z key_w_fix | 3.1.4.21 IJ48481m6b.240130.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf printers_fix.tar cd printers_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 ----------------------------------------------------------------------------------------------------- | 98812360ee802af2f3a25de73479067448cd7dc1bc6887e06d5cafdf3f849c4e IJ48481m5b.240202.epkg.Z key_w_csum | 65890606ee3e3875b1a95be42d14b3a59902e6334fba8997b6e7a0ee8711639b IJ48481m6b.240130.epkg.Z key_w_csum | 4a02bb76376d93fc58fd949a76fa6755caf565af6e463a138c9e92c0293d7adc IJ48539m1b.240202.epkg.Z key_w_csum | 18fa726f0d834d10536b65b8a069e92d7a6199eff7b55d2b63137d774108e6a4 IJ48539m2b.240202.epkg.Z key_w_csum | cc47a71127679358c350b6e2368011dca79d0686ad30950814d976241ae514a1 IJ48784m2b.240202.epkg.Z key_w_csum | 84a9ae6d1971068df76426dfe09c3bf00c9d10681fc2765419de1fd5e03fa4d9 IJ48784m3b.240202.epkg.Z key_w_csum | fdfc6f793040e464b4a98c1c51b74274e038d94aaaa897ae7f63202a238a3e63 IJ48784m4b.240202.epkg.Z key_w_csum | 9a53515a417ea5d9c45989fe295ee653120e8e080c161aff947779f89ec195d9 IJ49461m2c.240202.epkg.Z key_w_csum | 82e651eb0b23de993d71a2d703e6a264352ad2c6de5a3c4956c60af1124b0f89 IJ49461m4b.240202.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/printers_advisory.asc.sig C. 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 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: 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/printers_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 privilege escalation and denial of service (CVE-2023-45166, CVE-2023-45174, CVE-2023-45170) https://www.ibm.com/support/pages/node/7095022 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Mon Dec 11 13:23:17 CST 2023 | Updated: Fri Feb 2 13:43:05 CST 2024 | Update: New iFixes are available. The new iFixes resolve a technical issue | with print queue status. Both sets of iFixes (new and original) resolve | the security vulnerabilities described in the bulletin. The new iFixes are | only needed if you experience the technical issue described here: | https://www.ibm.com/support/pages/apar/IJ49737 =============================================================================== *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.