JPCERT-AT-2023-0023
                                                             JPCERT/CC
                                                            2023-10-11

                 <<< JPCERT/CC Alert 2023-10-11 >>>

         Microsoft Releases October 2023 Security Updates

       https://www.jpcert.or.jp/english/at/2023/at230023.html


I. Overview
Microsoft has released October 2023 Security Updates to address the
vulnerabilities in their products. Remote attackers leveraging
these vulnerabilities may be able to execute arbitrary code. It is
recommended to check the information provided by Microsoft and
apply the updates.

    Microsoft Corporation
    October 2023 Security Updates
    https://msrc.microsoft.com/update-guide/en-us/releaseNote/2023-Oct

    Microsoft Corporation
    Microsoft Security Updates for October 2023 (Monthly) (Japanese)
    https://msrc.microsoft.com/blog/2023/10/202310-security-update/

According to Microsoft, among the vulnerabilities, the following
vulnerabilities have been confirmed to be exploited in the wild. Please
consider applying the security update programs by referring to the
information provided by Microsoft.

    CVE-2023-36563
    Microsoft WordPad Information Disclosure Vulnerability
    https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36563

    CVE-2023-41763
    Skype for Business Elevation of Privilege Vulnerability
    https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-41763

    CVE-2023-44487
    MITRE: CVE-2023-44487 HTTP/2 Rapid Reset Attack
    https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-44487

Regarding the Denial of Service (DoS) vulnerability in the HTTP/2
protocol (CVE-2023-44487), information has also been released by
the discoverers of the vulnerability including Cloudflare.

    Cloudflare
    HTTP/2 Rapid Reset: deconstructing the record-breaking attack
    https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/


II. Solution
Please apply the security update programs through Microsoft Update,
Windows Update, etc. as soon as possible.

    Microsoft Update Catalog
    https://www.catalog.update.microsoft.com/

    Windows Update: FAQ
    https://support.microsoft.com/en-us/help/12373/windows-update-faq


III. References
    Microsoft Corporation
    Release Notes
    https://msrc.microsoft.com/update-guide/releaseNote

    The Exchange Team
    Released: October 2023 Exchange Server Security Updates
    https://techcommunity.microsoft.com/t5/exchange-team-blog/released-october-2023-exchange-server-security-updates/ba-p/3950647


If you have any information regarding this alert, please contact
JPCERT/CC.

======================================================================
JPCERT Coordination Center (Early Warning Group)
MAIL: ew-info@jpcert.or.jp
https://www.jpcert.or.jp/english/