7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.0004 Low
EPSS
Percentile
5.1%
IBM SECURITY ADVISORY
First Issued: Mon Sep 12 14:58:31 CDT 2022
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/invscout_advisory3.asc
https://aix.software.ibm.com/aix/efixes/security/invscout_advisory3.asc
ftp://aix.software.ibm.com/aix/efixes/security/invscout_advisory3.asc
Security Bulletin: AIX is vulnerable to a privilege escalation vulnerability
due to invscout (CVE-2022-36768)
===============================================================================
SUMMARY:
A vulnerability in the AIX invscout command could allow a non-privileged
local user to obtain root privileges (CVE-2022-36768).
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2022-36768
https://vulners.com/cve/CVE-2022-36768
https://vulners.com/cve/CVE-2022-36768
DESCRIPTION: IBM AIX could allow a non-privileged local user to exploit a
vulnerability in the invscout command to obtain root privileges.
CVSS Base Score: 8.4
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/232014
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
AFFECTED PRODUCTS AND VERSIONS:
AIX 7.1, 7.2, 7.3
VIOS 3.1
The following fileset levels are vulnerable:
key_fileset = aix
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
invscout.rte 2.2.0.0 2.2.0.22 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 invscout.rte
REMEDIATION:
A. FIXES
IBM strongly recommends addressing the vulnerability now.
AIX and VIOS fixes are available.
The AIX and VIOS fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/security/invscout_fix3.tar
http://aix.software.ibm.com/aix/efixes/security/invscout_fix3.tar
https://aix.software.ibm.com/aix/efixes/security/invscout_fix3.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 AIX
Technology Levels.
For AIX 7.1, 7.2, and VIOS 3.1, you must be on the 'bos.rte.libc
prereq' level before installing the new invscout.rte package.
AIX Level bos.rte.libc prereq
----------------------------------
7.1 7.1.5.30
7.2 7.2.3.0
VIOS Level bos.rte.libc prereq
----------------------------------
3.1 7.2.3.0
To extract the fixes from the tar file:
tar xvf invscout_fix3.tar
cd invscout_fix3
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
-----------------------------------------------------------------------------------------------------
7a3ad189232a95fe99eb88fc6faf890ee2ae9076e863d31e4fa97c9835aeb32a invscout.rte 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:
http://aix.software.ibm.com/aix/efixes/security/invscout_advisory3.asc.sig
https://aix.software.ibm.com/aix/efixes/security/invscout_advisory3.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/invscout_advisory3.asc.sig
B. 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 fix installation:
installp -apYd . invscout
To install the fix package:
installp -aXYd . invscout
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
To view previously issued advisories, please visit:
http://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
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 a privilege escalation
vulnerability due to invscout (CVE-2022-36768)
https://www.ibm.com/support/pages/node/6619725
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Mon Sep 12 14:58:31 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.