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<p class="MsoNormal"><a name="_Hlk122600425">Good afternoon,</a><span style="mso-bookmark:_Hlk122600425"><span style="mso-ligatures:none"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425">The SOC Services team is reporting on the vulnerability:</span><span style="mso-bookmark:_Hlk122600425"><span style="font-family:"Arial",sans-serif;mso-ligatures:none">
</span><b>CVE-2023-29357: </b></span><span style="mso-bookmark:_Hlk122600425"><b>Microsoft SharePoint Server Privilege Escalation Vulnerability</b>. Due to its high visibility and knowledge of the software installed in the state environment, we are providing
this in-depth information:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u>History</u></b>: On January 10, 2024, CISA added CVE-2023-29357 to the Known Exploited Vulnerabilities Catalog. CVE-2023- 29357 allows remote attackers to escalate privileges on unpatched installations
of Microsoft SharePoint Server, this was assigned a CVSS score of 9.8.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="background:yellow;mso-highlight:yellow"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425">Security notification and patch information from Microsoft can be found below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"></span><a href="https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-29357"><span style="mso-bookmark:_Hlk122600425">https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-29357</span><span style="mso-bookmark:_Hlk122600425"></span></a><span style="mso-bookmark:_Hlk122600425"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="background:yellow;mso-highlight:yellow"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u>Intelligence</u></b>: As of January 10, 2024, the vulnerability has been confirmed as being exploited in the wild.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="background:yellow;mso-highlight:yellow"><o:p><span style="text-decoration:none"> </span></o:p></span></u></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u>Workarounds:</u></b> There are no workarounds for this vulnerability.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u><span style="background:yellow;mso-highlight:yellow"><o:p><span style="text-decoration:none"> </span></o:p></span></u></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u>How it works</u></b>: This is an elevation of privilege (EoP) vulnerability in Microsoft SharePoint Server allows a remote, unauthenticated attacker can exploit the vulnerability by sending
a spoofed JSON Web Token (JWT) authentication token to a vulnerable server giving them the privileges of an authenticated user on the target. According to Microsoft’s advisory, no user interaction is required for an attacker to exploit this flaw.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="background:yellow;mso-highlight:yellow"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u>Post-Exploit</u></b>: Upon successful exploitation of the vulnerability, a threat actor could gain administrator privileges.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><span style="background:yellow;mso-highlight:yellow"><o:p> </o:p></span></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="mso-bookmark:_Hlk122600425">The following vulnerability plugins have been released and are currently in Tenable Security Center:<o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><b><u>Plugin<o:p></o:p></u></b></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><b><u>Title<o:p></o:p></u></b></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"><b><u>Severity<o:p></o:p></u></b></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"></span><a href="https://www.tenable.com/plugins/nessus/177243"><span style="mso-bookmark:_Hlk122600425">177243</span><span style="mso-bookmark:_Hlk122600425"></span></a><span style="mso-bookmark:_Hlk122600425"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b>Security Updates for Microsoft SharePoint Server 2019 (June 2023)<o:p></o:p></b></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425">Critical<o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"></span><a href="https://www.tenable.com/plugins/was/114099"><span style="mso-bookmark:_Hlk122600425">114099</span><span style="mso-bookmark:_Hlk122600425"></span></a><span style="mso-bookmark:_Hlk122600425"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b>Microsoft SharePoint Server 2019 build < 16.0.10399.20005 Elevation of Privilege<o:p></o:p></b></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425">Critical<o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425"></span><a href="https://www.tenable.com/plugins/nessus/187058"><span style="mso-bookmark:_Hlk122600425">187058</span><span style="mso-bookmark:_Hlk122600425"></span></a><span style="mso-bookmark:_Hlk122600425"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b>Microsoft SharePoint Authentication Bypass (CVE-2023-29357)<o:p></o:p></b></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425">Critical<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u><o:p><span style="text-decoration:none"> </span></o:p></u></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u>Additional Resources:</u></b>
<b><u><o:p></o:p></u></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"></span><a href="https://github.com/Chocapikk/CVE-2023-29357"><span style="mso-bookmark:_Hlk122600425">https://github.com/Chocapikk/CVE-2023-29357</span><span style="mso-bookmark:_Hlk122600425"></span></a><span style="mso-bookmark:_Hlk122600425"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><b><u>Recommended Actions</u></b>:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"> <o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="mso-list:l5 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">Verify host has not been compromised before applying patches.<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l5 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">Apply appropriate updates provided by vendor to vulnerable systems immediately after appropriate testing.<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l5 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">Limit access to affected devices from only trusted hosts.<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l5 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l5 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">Apply the Principle of Least Privilege to all systems and services.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><span style="color:#1F497D;mso-ligatures:none"><img border="0" width="121" height="87" style="width:1.2604in;height:.9062in" id="Picture_x0020_4" src="cid:image001.png@01DA43AC.E458ED40"></span><span style="color:#1F497D;mso-ligatures:none"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><b><span style="mso-ligatures:none">Cyber Security Services<o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:105%"><span style="mso-ligatures:none">State of Oregon Cyber Security Services<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%"><span style="mso-ligatures:none">Enterprise Information Services | SOC<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%"><span style="mso-ligatures:none">Cyber Security Services (CSS)<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:105%"><span style="mso-ligatures:none">SOC Hotline: (503) 378-5930 | SOC Services (503) 373-0378<span style="color:#1F497D"><o:p></o:p></span></span></p>
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<p class="MsoNormal" style="line-height:105%"><i><span style="color:#2E74B5;mso-ligatures:none">“Ensuring user-friendly, reliable and secure state technology systems that serve Oregonians.”<o:p></o:p></span></i></p>
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