IBM SECURITY ADVISORY

First Issued: Thu Jan 19 13:18:22 CST 2023

The most recent version of this document is available here:
https://aix.software.ibm.com/aix/efixes/powersc/security/bouncycastle_advisory.asc
ftp://aix.software.ibm.com/aix/efixes/powersc/security/bouncycastle_advisory.asc

Security Bulletin: PowerSC is vulnerable to information disclosure due to
    Bouncy Castle (CVE-2020-15522)

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

SUMMARY:

    A vulnerability in Bouncy Castle could allow a remote attacker to obtain
    sensitive information, which could be exploited to obtain private key
    information (CVE-2020-15522). PowerSC uses Bouncy Castle for cryptography.


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

VULNERABILITY DETAILS:

    CVEID: CVE-2020-15522
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15522
        https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15522
    DESCRIPTION: Bouncy Castle BC Java, BC C# .NET, BC-FJA, BC-FNA could
        allow a remote attacker to obtain sensitive information, caused by a
        timing issue within the EC math library. By utilize cryptographic
        attack techniques, an attacker could exploit this vulnerability to
        obtain the private key information, and use this information to
        launch further attacks against the affected system.
    CVSS Base score: 5.9
    CVSS Temporal Score: See:
        https://exchange.xforce.ibmcloud.com/vulnerabilities/202188
        for the current score.
    CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)


    AFFECTED PRODUCTS AND VERSIONS:
 
        PowerSC 1.3, 2.0, 2.1

        The vulnerabilities in the following filesets are being addressed:
        
        key_fileset = powerscStd.tnc_pm

        Fileset                       Lower Level  Upper Level KEY 
        ---------------------------------------------------------------
        powerscStd.tnc_pm             1.3.0.4      2.1.0.3     key_w_fs

        Note:  To find out whether the affected PowerSC filesets are installed
        on your systems, refer to the lslpp command found in AIX user's guide.

        Example:  lslpp -l | grep powerscStd


    REMEDIATION:

        IBM strongly recommends addressing the vulnerability now.

        Recommended remediation is to update to PowerSC 2.1.0.4 or later:
        https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=Virtualization%20software&product=ibm/power/IBM+PowerSC&release=All&platform=All&function=all
        

    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 PowerSC Security Advisories via email,
    please visit "My Notifications":

        http://www.ibm.com/support/mynotifications
        https://www.ibm.com/support/mynotifications

    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
        https://www.first.org/cvss/user-guide
    On-line Calculator v3:
        http://www.first.org/cvss/calculator/3.0
        https://www.first.org/cvss/calculator/3.0


ACKNOWLEDGEMENTS:

    None.


CHANGE HISTORY:

    First Issued: Thu Jan 19 13:18:22 CST 2023


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

*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.