6.2 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.3 High
AI Score
Confidence
High
0.0005 Low
EPSS
Percentile
18.0%
IBM SECURITY ADVISORY
First Issued: Tue Nov 7 11:16:49 CST 2023
The most recent version of this document is available here:
https://aix.software.ibm.com/aix/efixes/security/python_advisory6.asc
Security Bulletin: AIX is affected by a denial of service (CVE-2023-45167) and
a security restrictions bypass (CVE-2023-40217) due to Python
===============================================================================
SUMMARY:
A vulnerability in Python could allow a non-privileged local user to cause
a denial of service (CVE-2023-45167) and a remote attacker to cause a
security restrictions bypass (CVE-2023-40217). Python is used by AIX as
part of Ansible node management automation.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2023-45167
https://vulners.com/cve/CVE-2023-45167
DESCRIPTION: IBM AIX's Python implementation could allow a non-privileged
local user to exploit a vulnerability to cause a denial of service.
CVSS Base Score: 6.2
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/267965
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector:(CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2023-40217
https://vulners.com/cve/CVE-2023-40217
DESCRIPTION: Python could allow a remote attacker to bypass security
restrictions, caused by a race condition in the SSLSocket module.
When the socket is closed before the TLS handshake is complete, the
data is treated as if it had been encrypted by TLS. An attacker could
exploit this vulnerability to bypass the TLS handshake and inject a
malicious client certificate into the connection and gain access to
the server's resources without being authenticated.
CVSS Base Score: 7.4
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/264374
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector:(CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
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 3.9.17.1 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:
FIXES
IBM strongly recommends addressing the vulnerability now.
A fix is available, and it can be downloaded from:
https://www.ibm.com/resources/mrs/assets?source=aixbp
To extract the fixes from the tar file:
zcat python-3.9.18.0.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:
https://aix.software.ibm.com/aix/efixes/security/python_advisory6.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
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/python_advisory6.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 a denial of service (CVE-2023-45167)
and a security restrictions bypass (CVE-2023-40217) due to Python
https://www.ibm.com/support/pages/node/7068084
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Tue Nov 7 11:16:49 CST 2023
===============================================================================
*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.
6.2 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.3 High
AI Score
Confidence
High
0.0005 Low
EPSS
Percentile
18.0%