IBM SECURITY ADVISORY

First Issued: Wed Dec 20 12:53:51 CST 2023

The most recent version of this document is available here:
https://aix.software.ibm.com/aix/efixes/powersc/security/curl_advisory13.asc

Security Bulletin: Multiple vulnerabilities in Curl affect PowerSC

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SUMMARY:

    There are multiple vulnerabilities in Curl that affect PowerSC. PowerSC
    uses Curl as part of PowerSC Trusted Network Connect (TNC).


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

VULNERABILITY DETAILS:

    CVEID: CVE-2023-38039
        https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-38039
    DESCRIPTION: cURL libcurl is vulnerable to a denial of service, caused by
        not limiting the number and size of headers accept in a response. By
        sending a specially crafted request, a remote attacker could exploit
        this vulnerability to run out of heap memory, and results in a denial
        of service condition.
    CVSS Base score: 7.5
    CVSS Temporal Score: See:
        https://exchange.xforce.ibmcloud.com/vulnerabilities/265946
        for the current score.
    CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

    CVEID: CVE-2023-38546
        https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-38546
    DESCRIPTION: cURL libcurl could allow a remote attacker to bypass
        security restrictions, caused by a flaw in the curl_easy_duphandle
        function if a transfer has cookies enabled when the handle is
        duplicated. By sending a specially crafted request, an attacker could
        exploit this vulnerability to insert cookies at will into a running
        program.
    CVSS Base score: 3.7
    CVSS Temporal Score: See:
        https://exchange.xforce.ibmcloud.com/vulnerabilities/268046
        for the current score.
    CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N)

    CVEID: CVE-2023-38545
        https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-38545
    DESCRIPTION: libcurl and cURL are vulnerable to a heap-based buffer
        overflow, caused by the improper handling of hostnames longer than
        255 bytes during a slow SOCKS5 proxy handshake. By sending an overly
        long argument, a remote attacker could overflow a buffer and execute
        arbitrary code on the system.
    CVSS Base score: 8.1
    CVSS Temporal Score: See:
        https://exchange.xforce.ibmcloud.com/vulnerabilities/268045
        for the current score.
    CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)


    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
        key_fileset = curl-8.2.1-1.aix7.1.ppc.rpm

        Fileset                       Lower Level  Upper Level KEY 
        ---------------------------------------------------------------
        powerscStd.tnc_pm             1.3.0.4      2.1.0.6     key_w_fs
        curl-8.2.1-1.aix7.1.ppc.rpm   7.19.4       8.2.1       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.
        To find out whether the affected curl filesets are installed on your
        systems, refer to the rpm command found in AIX user's guide.

        Example:  lslpp -l | grep powerscStd
        Example:  rpm -qa | grep curl


    REMEDIATION:

        FIXES

            IBM strongly recommends addressing the vulnerability now.

            Fixes are available.

            The fixes can be downloaded via yum:

            To install any dependencies along with the fix package:

            yum update curl 


    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":

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

    Contact IBM Support for questions related to this announcement:

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


ACKNOWLEDGEMENTS:

    None.


CHANGE HISTORY:

    First Issued: Wed Dec 20 12:53:51 CST 2023


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*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.