CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
75.5%
IBM SECURITY ADVISORY
First Issued: Thu Oct 5 10:44:37 CDT 2023
|Updated: Thu Nov 2 09:55:16 CDT 2023
|Update: iFixes are now available for Perl 5.28.1 and 5.34.1.
| Perl version 5.28.1.7 and higher, and Perl version 5.34.1.4 and higher,
| have a dependency on OpenSSL 3.0.
| The iFixes are offered in lieu of updating to OpenSSL 3.0 and Perl 5.28.1.8
| and 5.34.1.4.
| The iFixes may be downloaded from:
| https://aix.software.ibm.com/aix/efixes/security/perl_fix7.tar
The most recent version of this document is available here:
https://aix.software.ibm.com/aix/efixes/security/perl_advisory7.asc
Security Bulletin: AIX is vulnerable to sensitive information exposure due to
Perl (CVE-2023-31484 and CVE-2023-31486)
===============================================================================
SUMMARY:
Multiple vulnerabilities in AIX's Perl could allow an attacker to launch a
man-in-the attack to obtain sensitive information or further compromise
the system (CVE-2023-31484 and CVE-2023-31486). AIX uses Perl in various
operating system components.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2023-31484
https://vulners.com/cve/CVE-2023-31484
DESCRIPTION: CPAN.pm is vulnerable to a man-in-the-middle attack, caused
by improper validation of TLS certificates when downloading
distributions over HTTPS. An attacker could exploit this
vulnerability to launch a man-in-the-middle attack and gain access to
the communication channel between endpoints to obtain sensitive
information or further compromise the system.
CVSS Base Score: 6.8
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/253974
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N)
CVEID: CVE-2023-31486
https://vulners.com/cve/CVE-2023-31486
DESCRIPTION: Perl HTTP::Tiny module is vulnerable to a man-in-the-middle
attack, caused by an insecure default TLS configuration. An attacker
could exploit this vulnerability to launch a man-in-the-middle attack
and gain access to the communication channel between endpoints to
obtain sensitive information or further compromise the system.
CVSS Base Score: 6.8
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/253358
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N)
AFFECTED PRODUCTS AND VERSIONS:
AIX 7.2, 7.3
VIOS 3.1
The following fileset levels are vulnerable:
key_fileset = aix
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
perl.rte 5.28.0.0 5.28.1.7 key_w_fs
perl.rte 5.34.0.0 5.34.1.3 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 perl.rte
REMEDIATION:
A. FIXES
IBM strongly recommends addressing the vulnerability now.
| AIX and VIOS fileset updates are available.
| The AIX and VIOS fileset update can be downloaded via https from,
under ‘Perl - Perl Version 5 Runtime’:
https://www.ibm.com/resources/mrs/assets?source=aixbp
For AIX 7.2 TL5, and 7.3 TL0, and for VIOS 3.1.2, 3.1.3,
and 3.1.4:
perl.rte.5.28.1.8
For AIX 7.3 TL1 and above:
perl.rte.5.34.1.4
| The fileset update has a dependency on OpenSSL 3.0.
| Alternatively, AIX and VIOS fixes are also available.
| The AIX and VIOS fixes can be downloaded via https from:
| https://aix.software.ibm.com/aix/efixes/security/perl_fix7.tar
| 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 Perl fileset
| levels.
AIX Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY |
---|
7.2.5, 7.3.0 31484m6a.231020.epkg.Z perl.rte(5.28.1.5) key_w_fix |
7.3.1 31484s2a.231018.epkg.Z perl.rte(5.34.1.2) key_w_fix |
VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY |
---|
3.1 31484m6a.231020.epkg.Z perl.rte(5.28.1.5) key_w_fix |
To extract the fixes from the tar file:
tar xvf perl_fix7.tar
cd perl_fix7
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 |
---|
f4f38ef1f7f4863dfb83486d11e41bdc774f5612476e02bbaa6580c1862b7753 31484m6a.231020.epkg.Z key_w_csum |
ad883ead31399c8ffb79261ddff5dd406f597c8cb2b9add1ae0a7fef44a1016a 31484s2a.231018.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/perl_advisory7.asc.sig
B. 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 the fileset installation:
installp -apYd . perl
To install the fileset update:
installp -aXYd . perl
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/perl_advisory7.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 sensitive information exposure
due to Perl (CVE-2023-31484 and CVE-2023-31486)
https://www.ibm.com/support/pages/node/7047272
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Thu Oct 5 10:44:37 CDT 2023
| Updated: Thu Nov 2 09:55:16 CDT 2023
| Update: iFixes are now available for Perl 5.28.1 and 5.34.1.
| Perl version 5.28.1.7 and higher, and Perl version 5.34.1.4 and higher,
| have a dependency on OpenSSL 3.0.
| The iFixes are offered in lieu of updating to OpenSSL 3.0 and
| Perl 5.28.1.8 and 5.34.1.4.
| The iFixes may be downloaded from:
| https://aix.software.ibm.com/aix/efixes/security/perl_fix7.tar
===============================================================================
*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.
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
75.5%