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<p class="MsoNormal"><a name="_Hlk122600425">Good morning,</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 vulnerabilities:
<b><i>CVE-2023-4966 Sensitive Information Disclosure in Citrix NetScaler ADC and Citrix NetScaler Gateway
</i></b>and <b><i>CVE-2023-4967 Denial of Service for Citrix NetScaler ADC and Citrix NetScaler Gateway</i></b>. Due to its high visibility, knowledge of the appliances in the state environment, and potential for exploitation, 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 October 10, 2023, Citrix released updates to patch their NetScaler ADC and NetScaler Gateway appliances, addressing two CVEs: CVE-2023-4966 is a Sensitive Information Disclosure
vulnerability and is currently assigned a CVSSv3 rating of 9.4 (Critical); and CVE-2023-4967 is a Denial of Service vulnerability and is currently assigned a CVSSv3 rating of 8.2 (High). The CVEs were established on October 10, 2023.<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">The following products are affected:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 14.1 before 14.1-8.50<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 13.1 before 13.1-49.15<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 13.0 before 13.0-92.19<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 13.1-FIPS before 13.1-37.164<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 12.1-FIPS before 12.1-55.300<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 12.1-NDcPP before 12.1-55.300<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">Patches are available from Citrix to fix the vulnerabilities. The fixed versions are:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 14.1-8.50 and later releases<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 13.1-49.15 and later releases of 13.1<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC and NetScaler Gateway 13.0-92.19 and later releases of 13.0<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 13.1-FIPS 13.1-37.164 and later releases of 13.1-FIPS<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 12.1-FIPS 12.1-55.300 and later releases of 12.1-FIPS<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo9"><span style="mso-bookmark:_Hlk122600425">NetScaler ADC 12.1-NDcPP 12.1-55.300 and later releases of 12.1-NDcPP<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">Further information is available from Citrix as published in their Knowledge Center:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3"><span style="mso-bookmark:_Hlk122600425">Citrix Security Bulletin for CVE-2023-4966 and CVE-2023-4967 –
</span><a href="https://support.citrix.com/article/CTX579459/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20234966-and-cve20234967"><span style="mso-bookmark:_Hlk122600425">https://support.citrix.com/article/CTX579459/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20234966-and-cve20234967</span><span style="mso-bookmark:_Hlk122600425"></span></a><span style="mso-bookmark:_Hlk122600425"><o:p></o:p></span></li></ul>
<p class="MsoListParagraph"><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 October 10, 2023, Citrix is unaware of either CVE being exploited. However, given that the appliances have recently been targets of other exploitable CVEs, and
that CVE-2023-4966 has the capability of being remotely exploitable, It is very likely that these vulnerabilities will be leveraged by threat actors over the coming months.<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>Workarounds:</u></b> 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>: CVE-2023-4966 is remotely exploitable without the need for high-level privileges, user interaction, or complex procedures. Both CVEs are exploited by unauthenticated
memory operations in the bounds of a memory buffer. For both CVEs to be exploited, the NetScaler appliance must be configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or as a 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>: Upon successful exploitation of CVE-2023-4966, an attacker could obtain sensitive information. Citrix has not yet provided details as to what specific information may
be disclosed.<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">Upon successful exploitation of CVE-2023-4967, an attacker could create a denial of service on the vulnerable device, affecting availability of resources.<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">No known indicators of compromise have been publicly shared at this time.<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 October 10, 2023 Tenable has not yet released plugins for either vulnerability, nor are any currently in development in the plugin pipeline.<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>
<span style="mso-bookmark:_Hlk122600425"></span>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="mso-list:l5 level1 lfo8">Enable logging<o:p></o:p></li><li class="MsoNormal" style="mso-list:l5 level1 lfo8">Remove or deny access to unnecessary and potentially vulnerable software to prevent abuse by adversaries.<o:p></o:p></li><li class="xmsonormal" style="mso-list:l5 level1 lfo8">Maintain good cyber hygiene and follow vendor patching recommendations.<o:p></o:p></li><li class="MsoNormal" style="mso-list:l5 level1 lfo8">Verify host has not been compromised before applying patches.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo8">Apply appropriate updates provided by vendor to vulnerable systems immediately after appropriate testing.<o:p></o:p></li><li class="MsoNormal" style="mso-list:l5 level1 lfo8">Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.<o:p></o:p></li><li class="MsoNormal" style="mso-list:l5 level1 lfo8">Apply the Principle of Least Privilege to all systems and services.<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></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:1.2638in;height:.9097in" id="Picture_x0020_4" src="cid:image001.png@01D9F1DD.F2FA0BC0"><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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