IBM SECURITY ADVISORY First Issued: Tue Nov 1 10:11:15 CDT 2022 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/python_advisory2.asc https://aix.software.ibm.com/aix/efixes/security/python_advisory2.asc ftp://aix.software.ibm.com/aix/efixes/security/python_advisory2.asc Security Bulletin: AIX is affected by arbitrary code execution (CVE-2022-40674) and denial of service (CVE-2020-10735) due to Python =============================================================================== SUMMARY: Vulnerabilities in Python could allow an attacker to execute arbitrary code (CVE-2022-40674) or cause a denial of service (CVE-2020-10735). Python is used by AIX as part of Ansible node management automation. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2022-40674 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-40674 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-40674 DESCRIPTION: libexpat could allow a remote attacker to execute arbitrary code on the system, caused by a use-after-free in the doContent function in xmlparse.c. An attacker could exploit this vulnerability to execute arbitrary code on the system. CVSS Base Score: 9.8 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/236116 for the current score CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVEID: CVE-2020-10735 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10735 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10735 DESCRIPTION: Python is vulnerable to a denial of service, caused by the failure to limit amount of digits converting text to int by the int() type in PyLong_FromString(). A remote attacker could exploit this vulnerability to consume all available resources. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/235840 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) AFFECTED PRODUCTS AND VERSIONS: AIX 7.3 The following fileset levels are vulnerable: key_fileset = osrcaix Fileset Lower Level Upper Level KEY ------------------------------------------------------ python3.9.base 3.9.0.0 3.9.13.99 key_w_fs Note: A. Latest level of Python fileset is available from the web download site: https://www-01.ibm.com/marketing/iwm/iwm/web/pickUrxNew.do?source=aixbp 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 python3.9.base REMEDIATION: FIXES IBM strongly recommends addressing the vulnerability now. A fix is available, and it can be downloaded from: https://www-01.ibm.com/marketing/iwm/iwm/web/pickUrxNew.do?source=aixbp To extract the fixes from the tar file: zcat python-3.9.14.0.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. To preview the fix installation: installp -apYd . python3.9.base To install the fix package: installp -aXYd . python3.9.base 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: http://aix.software.ibm.com/aix/efixes/security/python_advisory2.asc.sig https://aix.software.ibm.com/aix/efixes/security/python_advisory2.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/python_advisory2.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": http://www.ibm.com/support/mynotifications https://www.ibm.com/support/mynotifications To view previously issued advisories, please visit: http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq https://www14.software.ibm.com/webapp/set2/subscriptions/onvdq Contact IBM Support for questions related to this announcement: http://ibm.com/support/ https://ibm.com/support/ 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 Please contact your local IBM AIX support center for any assistance. REFERENCES: Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide https://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 https://www.first.org/cvss/calculator/3.0 RELATED INFORMATION: Security Bulletin: AIX is affected by arbitrary code execution (CVE-2022-40674) and denial of service (CVE-2020-10735) due to Python https://www.ibm.com/support/pages/node/6833562 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Tue Nov 1 10:11:15 CDT 2022 =============================================================================== *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.