IBM SECURITY ADVISORY First Issued: Tue Nov 5 15:21:42 CST 2024 The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/security/python_advisory13.asc Security Bulletin: AIX is affected by multiple vulnerabilities due to Python =============================================================================== SUMMARY: There are multiple vulnerabilities in Python used by AIX (CVE-2024-45491, CVE-2024-45490, CVE-2024-45492, CVE-2024-7592, CVE-2024-8088, CVE-2024-6923). Python is used by AIX as part of Ansible node management automation. =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2024-45491 https://www.cve.org/CVERecord?id=CVE-2024-45491 DESCRIPTION: libexpat could allow a local attacker to execute arbitrary code on the system, caused by an integer overflow in the dtdCopy function in xmlparse.c. By sending a specially crafted request, an attacker could exploit this vulnerability to execute arbitrary code on the system. CVSS Base Score: 7.3 CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) CVEID: CVE-2024-45490 https://www.cve.org/CVERecord?id=CVE-2024-45490 DESCRIPTION: libexpat could provide weaker than expected security, caused by not reject a negative length for XML_ParseBuffer. A local attacker could exploit this vulnerability to launch further attacks on the system. CVSS Base Score: 7.5 CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2024-45492 https://www.cve.org/CVERecord?id=CVE-2024-45492 DESCRIPTION: libexpat could allow a local attacker to execute arbitrary code on the system, caused by an integer overflow in the nextScaffoldPart function in xmlparse.c. By sending a specially crafted request, an attacker could exploit this vulnerability to execute arbitrary code on the system. CVSS Base Score: 7.3 CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) CVEID: CVE-2024-7592 https://www.cve.org/CVERecord?id=CVE-2024-7592 DESCRIPTION: Python CPython is vulnerable to a denial of service, caused by improper input validation by the http.cookies._unquote() function. By parsing specially crafted cookies that contained backslashes for quoted characters in the cookie value, a remote attacker could exploit this vulnerability to use excess CPU resources. CVSS Base Score: 7.5 CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2024-8088 https://www.cve.org/CVERecord?id=CVE-2024-8088 DESCRIPTION: Python CPython is vulnerable to a denial of service, caused by an infinite loop flaw when iterating over names of entries in a zip archive. By using a specially crafted zip archive, a remote attacker could exploit this vulnerability to cause a denial of service condition. CVSS Base Score: 8.7 CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/ SA:N/S:N/AU:N/R:U/RE:L) CVEID: CVE-2024-6923 https://www.cve.org/CVERecord?id=CVE-2024-6923 DESCRIPTION: Python CPython is vulnerable to email header injection, caused by the failure to properly quote newlines for email headers when serializing an email message. By persuading a victim to open a specially crafted email, a remote authenticated attacker could exploit this vulnerability to spoof sender identity, gain unauthorized email sending or loss of control over email communication. CVSS Base Score: 5.5 CVSS Environmental Score*: Undefined CVSS Vector:(CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L) AFFECTED PRODUCTS AND VERSIONS: AIX 7.3 VIOS 4.1 The following fileset levels are vulnerable: key_fileset = osrcaix Fileset Lower Level Upper Level KEY ------------------------------------------------------ python3.9.base 3.9.0.0 3.9.19.3 key_w_fs Note: A. Latest level of Python fileset is available from the web download site: https://www.ibm.com/resources/mrs/assets?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: A. FIXES IBM strongly recommends addressing the vulnerability now. The fixes can be downloaded via https from: https://aix.software.ibm.com/aix/efixes/security/python_fix13.tar The links above are 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 Fix (*.Z) KEY ---------------------------------------------- 7.3 python-3.9.20.0.tar.Z key_w_fix VIOS Level Fix (*.Z) KEY ---------------------------------------------- 4.1 python-3.9.20.0.tar.Z key_w_fix To extract the fixes from the tar file: tar xvf python_fix13.tar cd python_fix13 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 [file]" command as the following: openssl dgst -sha256 filename KEY -------------------------------------------------------------------------------------------------- 9b254863ecb37a1c8a27564c29c1062acef32f3d5c18876fb9742016b157470e python-3.9.20.0.tar.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 AIX Support at https://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/python_advisory13.asc.sig B. FIX AND INTERIM FIX INSTALLATION To extract the fixes from the tar file: zcat python-3.9.19.3.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. To preview the fix installation: installp -apYd . python3.9.base To install the fix package: installp -aXYd . python3.9.base 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: 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/python_advisory13.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: 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 affected by multiple vulnerabilities due to Python https://www.ibm.com/support/pages/node/7174912 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Tue Nov 5 15:21:42 CST 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.