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<div class="WordSection1">
<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><b>CVE-2023-29552: Service Location Protocol (SLP) Denial-of-Service 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 November 8, 2023, CISA added CVE-2023-29552 an vulnerability with a CVSS score of 7.5 to the Known Exploited Vulnerabilities Catalog. The Service Location Protocol (SLP,
RFC 2608) allows an unauthenticated, remote attacker to register arbitrary services.<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">This vulnerability is not vendor specific, thus detailed patch information cannot be provided. Please check with your software vendors for additional guidance.<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"><i>This list does not include all vendors, please check with your software providers for additional information.<o:p></o:p></i></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425">Vulnerable software versions:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">Red Hat Enterprise Linux 6 (openslp package)<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">Red Hat Enterprise Linux 7 (openslp package)<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">Red Hat Enterprise Linux 9 (openslp package)<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo6"><span style="mso-bookmark:_Hlk122600425">Unsupported ESXI releases<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425">Not affected software versions:<o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo7"><span style="mso-bookmark:_Hlk122600425">Red Hat Enterprise Linux 8 (openslp package)<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l5 level1 lfo7"><span style="mso-bookmark:_Hlk122600425">Currently supported ESXI releases (ESXI 7.x and 8.x)<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"><b><u>Intelligence</u></b>: As of November 8, 2023, 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> To prevent external attackers from accessing the SLP service, disable SLP on all systems running on untrusted networks, such as those directly connected to the internet.
Additionally, configure firewalls to block or filter traffic on UDP and TCP port 427.<span style="background:yellow;mso-highlight:yellow"><o:p></o:p></span></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>: The OpenSLP provides a dynamic configuration mechanism for applications in local area networks, such as printers and file servers. However, SLP is vulnerable to a reflective
denial of service amplification attack through UDP on systems connected to the internet. SLP allows an unauthenticated attacker to register new services without limits set by the SLP implementation. By using UDP and spoofing the source address, an attacker
can request the service list, creating a Denial of Service on the spoofed address.<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 execute arbitrary java code or possibly system code.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk122600425"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="mso-bookmark:_Hlk122600425">As of May 23, 2023, the following vulnerability plugin has been released and is currently in Tenable Security Center:<o:p></o:p></span></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse">
<tbody>
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<td width="119" valign="top" style="width:89.5pt;border:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<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/176249"><span style="mso-bookmark:_Hlk122600425">176249</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">ESXi < 7.0 Reflected Denial of Service<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>:<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:l2 level1 lfo4"><span style="mso-bookmark:_Hlk122600425">Check for the vulnerability with your software providers.<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l2 level1 lfo4"><span style="mso-bookmark:_Hlk122600425">Verify host has not been compromised before applying patches.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 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:l2 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:l2 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_4" src="cid:image001.png@01DA1228.41D857A0"><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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