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<p class="MsoNormal"><a name="_Hlk122600425">Good morning,<span style="mso-ligatures:none"><o:p></o:p></span></a></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></span><span style="mso-bookmark:_Hlk122600425"><b>CVE-2023-6548 & CVE-2023-6549: Citrix NetScaler ADC & NetScaler Gateway Code Injection & Buffer Overflow Vulnerabilities</b></span><span style="mso-bookmark:_Hlk122600425">. 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></span><span style="mso-bookmark:_Hlk122600425">: On January 17, 2024, CISA added CVE-2023-6548 (CVSS 5.5) & CVE-2023-6549 (CVSS 8.2): Citrix NetScaler ADC & NetScaler Gateway
Code Injection & Buffer Overflow Vulnerabilities to the Known Exploited Vulnerabilities Catalog. On January 16, 2024, Citrix released a security bulletin urging customers to update.<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">Citrix had the following to say about the affected products, “This bulletin only applies to customer-managed NetScaler ADC and NetScaler Gateway products. Customers using Citrix-managed cloud services
or Citrix-managed Adaptive Authentication do not need to take any action.”.<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">The following products are affected:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="mso-list:l1 level1 lfo5"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 14.1 before 14.1-12.35<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo5"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 13.1 before 13.1-51.15<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo5"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 13.0 before 13.0-92.21<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo5"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 13.1-FIPS before 13.1-37.176<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo5"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 12.1-FIPS before 12.1-55.302<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo5"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 12.1-NDcPP before 12.1-55.302<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo5"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway version 12.1 is now End Of Life (EOL) and is vulnerable.<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">Fixed versions:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="mso-list:l2 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 14.1-12.35 and later releases<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l2 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 13.1-51.15 and later releases of 13.1<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l2 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 13.0-92.21 and later releases of 13.0 <o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l2 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 13.1-FIPS 13.1-37.176 and later releases of 13.1-FIPS <o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l2 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 12.1-FIPS 12.1-55.302 and later releases of 12.1-FIPS <o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l2 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 12.1-NDcPP 12.1-55.302 and later releases of 12.1-NDcPP <o:p></o:p></span></li></ul>
<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">The security bulletin related to these vulnerabilities by Citrix can be found here:
</span><a href="https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549"><span style="mso-bookmark:_Hlk122600425">https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549</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></span><span style="mso-bookmark:_Hlk122600425">: As of January 17, 2024, the vulnerabilities have 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></span><span style="mso-bookmark:_Hlk122600425"> There are no workarounds at this time.<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></span><span style="mso-bookmark:_Hlk122600425">: These vulnerabilities require attackers to be logged in to low-privilege accounts on the targeted instance and need access
to NSIP, CLIP, or SNIP with management interface access. Appliances would also have to be configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.<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></span><span style="mso-bookmark:_Hlk122600425">: Upon successful exploitation of the vulnerability, a threat actor could inject code (CVE-2023-6548) or execute denial of
service attacks (CVE-2023-6549).<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">As of January 17, 2024, the following vulnerability plugin has been released and is 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/189070"><span style="mso-bookmark:_Hlk122600425">189070</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" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway Multiple Vulnerabilities (CTX584986l)<o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="mso-bookmark:_Hlk122600425">High<o:p></o:p></span></p>
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<p class="MsoNormal" style="text-align:justify"><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>Recommended Actions</u></b></span><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>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="mso-list:l3 level1 lfo4"><span style="mso-bookmark:_Hlk122600425">If possible implement the mitigating factors in the Citrix bulletin.<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l3 level1 lfo4"><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:l3 level1 lfo4"><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:l3 level1 lfo4"><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:l3 level1 lfo4"><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"><img border="0" width="121" height="87" style="width:1.2583in;height:.9083in" id="Picture_x0020_2" src="cid:image001.png@01DA4931.4F4D44A0"><span style="mso-ligatures:none"><o:p></o:p></span></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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