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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Good morning,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"> <span style="mso-ligatures:standardcontextual"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">The SOC Services team is reporting on the vulnerability:
<b>CVE-2022-2586: Linux Kernel Use-After-Free Vulnerability</b>. Due to its high visibility and its listing on CISA’s Known Exploited Vulnerability database, we are providing this in-depth information:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"> <span style="mso-ligatures:standardcontextual"><o:p></o:p></span></span></p>
<p class="MsoNormal"><b><u><span style="font-family:"Calibri",sans-serif">History</span></u></b><span style="font-family:"Calibri",sans-serif">: On January 8, 2024, CVE-2022-2586: Linux Kernel Use-After-Free Vulnerability was released by the National Vulnerability
Database (NVD). The vulnerability currently is assigned a CVSSv3 score of 7.8 (High). Additionally, this vulnerability has been released by CISA through its Known Exploited Vulnerability Catalog on June 26, 2024.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><u><span style="font-family:"Calibri",sans-serif">Affected Versions:<o:p></o:p></span></u></b></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">The number of affected operating systems is extensive; therefore, we will not be providing a list of affected software. However, you can find the affected operating systems on the Ubuntu site.
The website link is: <a href="https://ubuntu.com/security/CVE-2022-2586">https://ubuntu.com/security/CVE-2022-2586</a></span><span style="font-size:12.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;background:yellow;mso-highlight:yellow"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><u><span style="font-family:"Calibri",sans-serif">Intelligence</span></u></b><span style="font-family:"Calibri",sans-serif">: As of June 26, 2024, the vulnerability has been confirmed as being exploited in the wild.<o:p></o:p></span></p>
<p class="MsoNormal"><b><u><span style="font-size:12.0pt;font-family:"Calibri",sans-serif;background:yellow;mso-highlight:yellow"><o:p><span style="text-decoration:none"> </span></o:p></span></u></b></p>
<p class="MsoNormal"><b><u><span style="font-family:"Calibri",sans-serif">Workarounds:</span></u></b><span style="font-family:"Calibri",sans-serif"> At this time there are no workarounds.<o:p></o:p></span></p>
<p class="MsoNormal"><b><u><span style="font-family:"Calibri",sans-serif;background:yellow;mso-highlight:yellow"><o:p><span style="text-decoration:none"> </span></o:p></span></u></b></p>
<p class="MsoNormal"><b><u><span style="font-family:"Calibri",sans-serif">How it works</span></u></b><span style="font-family:"Calibri",sans-serif">: The vulnerability flaw exists within the handling of nft_objects. It was discovered that the netfilter subsystem
of the Linux kernel did not prevent one nft object from referencing an nft set in another nft table, leading to a use-after-free vulnerability. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of
root. Additionally, it was discovered that a nft object or expression could reference a nft set on a different nft table, also enables a possible escalation of privileges leading to a use-after-free once that table was deleted. Exploiting it requires CAP_NET_ADMIN
in any user or network namespace.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;background:yellow;mso-highlight:yellow"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><u><span style="font-family:"Calibri",sans-serif">Post-Exploit</span></u></b><span style="font-family:"Calibri",sans-serif">:
<span style="color:black;background:white">Upon successful exploitation, a threat actor could
</span>initiate a use-<em><span style="font-family:"Calibri",sans-serif;font-style:normal">after</span></em>-free situation and supply a string of size 0xc7 (matching the nft_object counter allocation). This could result in local privilege escalation and permit
execution of arbitrary code.<span style="color:red;background:yellow;mso-highlight:yellow"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#222222;background:yellow;mso-highlight:yellow"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Calibri",sans-serif">As of June 26, 2024, Tenable has 63 plugins for this vulnerability, which can be found here:
<a href="https://www.tenable.com/plugins/search?q=%22CVE-2022-2586%22&sort=&page=1">
https://www.tenable.com/plugins/search?q=%22CVE-2022-2586%22&sort=&page=1</a>. Alternatively, you can log into Tenable.sc and utilize the search bar at the top right corner on your dashboard, enter CVE-2022-2586 to find any results.<o:p></o:p></span></p>
<p class="MsoNormal"><b><u><span style="font-family:"Calibri",sans-serif">Recommended Actions</span></u></b><span style="font-family:"Calibri",sans-serif">:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"> <o:p></o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoNormal" style="mso-list:l1 level1 lfo3"><span style="font-family:"Calibri",sans-serif">Verify host has not been compromised before applying patches.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo3"><span style="font-family:"Calibri",sans-serif">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:l1 level1 lfo3"><span style="font-family:"Calibri",sans-serif">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:l1 level1 lfo3"><span style="font-family:"Calibri",sans-serif">Apply the Principle of Least Privilege to all systems and services<o:p></o:p></span></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"><img border="0" width="121" height="87" style="width:1.2604in;height:.9062in" id="Picture_x0020_4" src="cid:image001.png@01DAC876.60384ED0"></span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><b>Cyber Security Services<o:p></o:p></b></p>
<p class="MsoNormal" style="line-height:105%">State of Oregon Cyber Security Services<o:p></o:p></p>
<p class="MsoNormal" style="line-height:105%">Enterprise Information Services | SOC<o:p></o:p></p>
<p class="MsoNormal" style="line-height:105%">Cyber Security Services (CSS)<o:p></o:p></p>
<p class="MsoNormal" style="line-height:105%">SOC Hotline: (503) 378-5930 | SOC Services (503) 373-0378<span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><i><span style="color:#2E74B5">“Ensuring user-friendly, reliable and secure state technology systems that serve Oregonians.”<o:p></o:p></span></i></p>
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<p class="MsoNormal"><span style="mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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