Security Bulletin
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
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 Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)
CVEID: 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 Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| AIX | 7.2 |
| AIX | 7.3 |
| VIOS | 3.1 |
| VIOS | 4.1 |
The following fileset levels are vulnerable:
| Fileset | Lower Level | Upper Level |
| openssl.base | 1.1.1.0 | 1.1.1.2200 |
| openssl.base | 1.1.2.0 | 1.1.2.2200 |
| openssl.base | 3.0.5.101 | 3.0.10.1002 |
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
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
To verify the signature files:
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
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
16 Jul 2024: Initial Publication
*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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
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Document Information
Modified date:
16 July 2024
UID
ibm17160457