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Security Bulletin: AIX is affected by arbitrary code execution [CVE-2022-40674] and denial of service [CVE-2020-10735] due to Python

Security Bulletin


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
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 Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

CVEID:   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 Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s)Version(s)
AIX7.3

 

The following fileset levels are vulnerable:

 

FilesetLower LevelUpper Level
python3.9.base3.9.0.03.9.13.99

 

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

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

Get Notified about Future Security Bulletins

References

Off

Change History

01 Nov 2022: Initial Publication

*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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location

Worldwide

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Document Information

Modified date:
01 November 2022

UID

ibm16833562