Security Bulletin: AIX is vulnerable to privilege escalation (CVE-2024-27273)

Summary

Vulnerability in the AIX kernel may lead to privilege escalation (CVE-2024-27273).

Vulnerability Details

CVEID:CVE-2024-27273
**DESCRIPTION:**IBM AIX’s Unix domain datagram socket implementation could potentially expose applications using Unix domain datagram sockets with SO_PEERID operation and may lead to privilege escalation.
CVSS Base score: 8.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/284903 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H)

Affected Products and Versions

The vulnerabilities in the following filesets are being addressed:

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 bos.mp64

Remediation/Fixes

A. APARS

IBM has assigned the following APARs to this problem:

Subscribe to the APARs here:

<https://www.ibm.com/support/pages/apar/&gt;[APAR Number]

By subscribing, you will receive periodic email alerting you to the status of the APAR, and a link to download the fix once it becomes available.

B. FIXES

IBM strongly recommends addressing the vulnerability now.

AIX and VIOS fixes are available.

An LPAR system reboot is required to complete the iFix installation, or Live Update may be used on AIX 7.2 and 7.3 to avoid a reboot.

The AIX and VIOS fixes can be downloaded via https from:

<https://aix.software.ibm.com/aix/efixes/security/kernel_fix7.tar&gt;

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.

Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.5.6 is AIX 7200-05-06.

Please reference the Affected Products and Version section above for help with checking installed fileset levels.

The fixes are cumulative and address previously issued AIX/VIOS kernel security and HIPER bulletins with respect to SP and TL, which includes:

<https://aix.software.ibm.com/aix/efixes/security/kernel_advisory6.asc&gt;

<https://www.ibm.com/support/pages/node/7105282&gt;

<https://www.ibm.com/support/pages/node/6857545&gt;

<https://aix.software.ibm.com/aix/efixes/security/kernel_advisory5.asc&gt;

<https://www.ibm.com/support/pages/node/6847947&gt;

To extract the fixes from the tar file:

tar xvf kernel_fix7.tar

cd kernel_fix7

Verify you have retrieved the fixes intact:

The checksums below were generated using the “openssl dgst -sha256 [filename]” command as the following:

Workarounds and Mitigations

None