AIX is vulnerable to a denial of service (CVE-2024-2511 CVE-2024-0727) due to OpenSSL

IBM SECURITY ADVISORY

First Issued: Tue Jul 16 15:22:01 CDT 2024

The most recent version of this document is available here:

https://aix.software.ibm.com/aix/efixes/security/openssl_advisory41.asc

Security Bulletin: AIX is vulnerable to a denial of service (CVE-2024-2511,
CVE-2024-0727) due to OpenSSL

===============================================================================

SUMMARY:

Vulnerabilities in OpenSSL could allow a remote attacker to cause a denial
of service (CVE-2024-2511, CVE-2024-0727). OpenSSL is used by AIX as part
of AIX's secure network communications.

===============================================================================

VULNERABILITY DETAILS:

CVEID: CVE-2024-2511
    https://vulners.com/cve/CVE-2024-2511
DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by
    improper server configuration validation. By using a specially crafted
    server configuration, a remote attacker could exploit this
    vulnerability to cause unbounded memory growth, and results in a
    denial of service condition.
CVSS Base Score: 3.7
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/287215
    for the current score
CVSS Environmental Score*: Undefined
CVSS Vector:(CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)

CVEID: CVE-2024-0727
    https://vulners.com/cve/CVE-2024-0727
DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by
    improper input validation. By persuading a victim to open a specially
    crafted PKCS12 file, a remote attacker could exploit this
    vulnerability to cause the application to crash.
CVSS Base Score: 3.1
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/280532
    for the current score
CVSS Environmental Score*: Undefined
CVSS Vector:(CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L)


AFFECTED PRODUCTS AND VERSIONS:

    AIX 7.2, 7.3
    VIOS 3.1, 4.1

    The following fileset levels are vulnerable:
    
    key_fileset = osrcaix

    Fileset          Lower Level    Upper Level    KEY
    -------------------------------------------------------
    openssl.base     1.1.1.0        1.1.1.2200     key_w_fs
    openssl.base     1.1.2.0        1.1.2.2200     key_w_fs
    openssl.base     3.0.5.101      3.0.10.1002    key_w_fs

    Note:
    A. 0.9.8, 1.0.1 OpenSSL versions are out-of-support. Support for
        OpenSSL 1.0.2 version ended in December 2023. Customers are
        advised to upgrade to OpenSSL 1.1.1 or 3.0 version.

    B. Latest level of OpenSSL fileset is available from the web download site:
        https://www.ibm.com/resources/mrs/assets?source=aixbp&S_PKG=openssl

    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 openssl.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&S_PKG=openssl

        To extract the fixes from the tar file:

        For OpenSSL 3.0:
        zcat openssl-3.0.13.1000.tar.Z | tar xvf -

        For OpenSSL 1.1.1 with no weak ciphers support:
        zcat openssl-1.1.2.2400.tar.Z | tar xvf -

        For OpenSSL 1.1.1 with all ciphers support:
        zcat openssl-1.1.1.2400.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. Please refer to 
        the readme file (provided along with the fileset) for the complete
        list of vulnerabilities fixed.

        To preview the fix installation:

        installp -apYd . openssl

        To install the fix package:

        installp -aXYd . openssl
                    
        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/openssl_advisory41.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":

    https://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:

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/openssl_advisory41.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:

Review this information as needed, no action required.

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 vulnerable to a denial of service (CVE-2024-2511,
    CVE-2024-0727) due to OpenSSL
    https://www.ibm.com/support/pages/node/7160457

ACKNOWLEDGEMENTS:

None.

CHANGE HISTORY:

First Issued: Tue Jul 16 15:22:01 CDT 2024

===============================================================================

*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.