Palo Alto Networks patches firewall-busting zero-days • The Register

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href="https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=2&c=2Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0" target="_blank"> <img src="https://pubads.g.doubleclick.net/gampad/ad?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=2&c=2Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0" alt=""> </a> </noscript> </div> <article> <div id=top-col-story> <div class="header_left"> <div class="cat_header"> <h4 class="dcl"> <a href="/security/patches/" aria-label="Patches">Patches</a> </h4> </div> <div class="comments_wrap mobile_only"> <a class="comment_count" aria-label="Read comments on this article, currently there are 4 comments" title="View comments on this article" href="https://forums.theregister.com/forum/all/2024/11/19/palo_alto_networks_patches/"> <strong aria-hidden="true">4</strong> <img aria-hidden="true" width="18" height="16" alt="comment bubble on white" src="/design_picker/f5daacc84b9722c1e31ba85f836c37e4ad993fc4/graphics/icons/bubble_comment_white.png" srcset="/design_picker/f5daacc84b9722c1e31ba85f836c37e4ad993fc4/graphics/icons/bubble_comment_white.svg"> </a> </div> </div> <div class="header_right"> <h1>Palo Alto Networks tackles firewall-busting zero-days with critical patches</h1> </div> <div class="header_left"> <div class="comments_wrap desktop_only"> <a class="comment_count" aria-label="Read comments on this article, currently there are 4 comments" title="View comments on this article" href="https://forums.theregister.com/forum/all/2024/11/19/palo_alto_networks_patches/"> <strong aria-hidden="true">4</strong> <img aria-hidden="true" width="18" height="16" alt="comment bubble on white" src="/design_picker/f5daacc84b9722c1e31ba85f836c37e4ad993fc4/graphics/icons/bubble_comment_white.png" srcset="/design_picker/f5daacc84b9722c1e31ba85f836c37e4ad993fc4/graphics/icons/bubble_comment_white.svg"> </a> </div> </div> <div class="header_right"> <h2>Amazing that these two bugs got into a production appliance, say researchers</h2> <div class="byline_and_dateline_and_share_and_comments"> <div class="byline_wrap"> <img class="vulture_icon" src="/design_picker/d518b499f8a6e2c65d4d8c49aca8299d54b03012/graphics/icon/vulture_red.svg" alt="icon"> <a class="byline" href="/Author/Connor-Jones" title="Read more by this author"> Connor Jones </a> </div> <div class="dateline_wrap"> <span class="dateline"> Tue 19 Nov 2024 <span class="slashes"> // </span> 15:29 UTC </span> </div> </div> </div> </div> <div id=main-col> <div id="article-wrapper" class="article_wrap"> <div class="left_col"> <div class="floating_bar"> <div class="sharing_widget_story_desktop uses_overlay"> <button 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target="_blank"> </a> </div> </div> </div> </div> <div class="promo_advert"> </div> </div> <div class="centre_col"> <div id="article"> <div id="body"> <p>Palo Alto Networks (PAN) finally released a CVE identifier and patch for the zero-day exploit that caused such a fuss last week.</p> <p>The vendor dropped details of two vulnerabilities exploited as zero-days. The first, tracked as CVE-2024-0012, an authentication bypass bug, has a 9.3 (critical) severity rating, and users are encouraged to upgrade to one of the many patched maintenance versions of PAN-OS with the highest degree of urgency.</p> <p>The second, CVE-2024-9474, carries a less severe 6.9 (medium) severity rating and is classified as a privilege escalation bug. Like the first bug, it also affects the PAN-OS management interface but also allows attackers to gain admin access and perform actions as root.</p> <div aria-hidden="true" class="adun" data-pos="top" data-raptor="condor" data-xsm=",fluid,mpu," data-sm=",fluid,mpu," data-md=",fluid,mpu,"> <noscript> <a href="https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=2&c=2Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0" target="_blank"> <img src="https://pubads.g.doubleclick.net/gampad/ad?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=2&c=2Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0" alt=""> </a> </noscript> </div> <p>Both advisories for <a target="_blank" href="https://security.paloaltonetworks.com/CVE-2024-0012" rel="nofollow">CVE-2024-0012</a> and <a target="_blank" href="https://security.paloaltonetworks.com/CVE-2024-9474" rel="nofollow">CVE-2024-9474</a> detail the specific versions that are deemed safe. They contain a list of the latest versions available and a limited number of earlier iterations that are more commonly deployed.</p> <div aria-hidden="true" class="adun" data-pos="top" data-raptor="falcon" data-xmd=",fluid,mpu,leaderboard," data-lg=",fluid,mpu,leaderboard," data-xlg=",fluid,billboard,superleaderboard,mpu,leaderboard," data-xxlg=",fluid,billboard,superleaderboard,brandwidth,brandimpact,leaderboard,mpu,"> <noscript> <a href="https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0" target="_blank"> <img src="https://pubads.g.doubleclick.net/gampad/ad?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0" alt=""> </a> </noscript> </div> <div class="adun_eagle_desktop_story_wrapper"> <div aria-hidden="true" class="adun" data-pos="mid" data-raptor="eagle" data-xxlg=",mpu,dmpu,"> <noscript> <a href="https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=3&c=33Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0" target="_blank"> <img src="https://pubads.g.doubleclick.net/gampad/ad?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=3&c=33Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0" alt=""> </a> </noscript> </div> </div> <p>PAN <a target="_blank" href="https://www.theregister.com/2024/11/15/palo_alto_networks_firewall_zeroday/">warned customers on Thursday</a> that it was aware of a remote command execution bug being actively exploited on various publicly exposed firewall interfaces and a fix was coming soon.</p> <p>While customers awaited a proper patch, PAN implored customers to "immediately" revoke public internet access to the management interface if it wasn't already and ensure only trusted internal IPs could access it.</p> <div aria-hidden="true" class="adun" data-pos="top" data-raptor="falcon" data-xsm=",fluid,mpu," data-sm=",fluid,mpu," data-md=",fluid,mpu,"> <noscript> <a href="https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0" target="_blank"> <img src="https://pubads.g.doubleclick.net/gampad/ad?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D426raptor%3Dfalcon%26pos%3Dmid%26test%3D0" alt=""> </a> </noscript> </div> <p>The risk of the exploit working was "greatly reduced" if these steps were taken at the end of last week.</p> <p>You'll notice that the description of CVE-2024-0012 – "authentication bypass" – differs from the wording used when PAN teased it last week as a command execution issue.</p> <p>It isn't clear why the definition has changed. However, the admission that it can be used in conjunction with vulnerabilities like CVE-2024-9474 suggests that PAN discovered it wasn't the sole cause of the exploit activity detected last week. Rather, it could have been chained with the second zero-day, which does allow attackers to execute commands.</p> <div aria-hidden="true" class="adun" id="story_eagle_xsm_sm_md_xmd_lg_xlg" data-pos="mid" data-raptor="eagle" data-xsm=",mpu,dmpu," data-sm=",mpu,dmpu," data-md=",mpu,dmpu," data-xmd=",mpu,dmpu," data-lg=",mpu,dmpu," data-xlg=",mpu,dmpu,"> <noscript> <a href="https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=3&c=33Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0" target="_blank"> <img src="https://pubads.g.doubleclick.net/gampad/ad?co=1&iu=/6978/reg_security/patches&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=3&c=33Z0N2UEx1tDYrMVKhYc60AgAAARc&t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0" alt=""> </a> </noscript> </div> <p>While PAN didn't explicitly say the two vulnerabilities were being chained, the researchers over at watchTowr appeared to assume they were.</p> <p>They wrote in a <a target="_blank" href="https://labs.watchtowr.com/pots-and-pans-aka-an-sslvpn-palo-alto-pan-os-cve-2024-0012-and-cve-2024-9474/?123" rel="nofollow">blog</a>: "This is a pair of bugs, described as 'authentication bypass in the management web interface' and a 'privilege escalation' respectively, strongly suggesting they are used as a chain to gain superuser access, a pattern that we've seen before with Palo Alto appliances."</p> <p>The researchers added that for CVE-2024-0012, they were able to exploit it by supplying the x-pan-authcheck header with the value "off" in an HTTP request, disabling device authentication.</p> <p>From there, they then showed how CVE-2024-9474 relies on <a target="_blank" href="https://www.theregister.com/2020/06/08/25_years_of_php/">PHP</a> and could then be exploited using a series of specially crafted requests, falling just short of publishing a full proof-of-concept code – unlike watchTowr's usual style – thereby allowing admins to apply the necessary patches.</p> <ul class="listinks"> <li><a href="https://www.theregister.com/2024/11/16/swiss_malware_qr/">Swiss cheesed off as postal service used to spread malware</a></li> <li><a href="https://www.theregister.com/2024/11/15/palo_alto_networks_firewall_zeroday/">Mystery Palo Alto Networks hijack-my-firewall zero-day now officially under exploit</a></li> <li><a href="https://www.theregister.com/2024/11/14/five_eyes_2023_top_vulnerabilities/">Five Eyes infosec agencies list 2023's most exploited software flaws</a></li> <li><a href="https://www.theregister.com/2024/11/13/microsoft_task_manager_patch_tuesday/">Microsoft slips Task Manager and processor count fixes into Patch Tuesday</a></li> </ul> <p>"So, yet another super-duper secure next-generation hardened security appliance popped," watchTowr commented.</p> <p>"This time it's due to those pesky backticks, combined with the super-complicated step of simply asking the server not to check our authentication via x-pan-authcheck.</p> <p>"It's amazing that these two bugs got into a production appliance, amazingly allowed via the hacked-together mass of shell script invocations that lurk under the hood of a Palo Alto appliance."</p> <p>As of Monday, PAN said it was tracking a "limited set of exploitation activity" without going into any great detail about the scale at which the flaws were being attacked, or by whom, although it was said to be still ongoing.</p> <p>"Palo Alto Networks has identified threat activity targeting a limited number of device management web interfaces," the vendor said. "This activity has primarily originated from IP addresses known to proxy/tunnel traffic for anonymous <a target="_blank" href="https://www.theregister.com/2024/07/05/kremlin_internet_censor_vpn/">VPN</a> services.</p> <p>"Palo Alto Networks is still actively investigating and remediating this activity. Observed post-exploitation activity includes interactive command execution and dropping malware, such as webshells, on the firewall."</p> <p>According to internet security organization The Shadowserver Foundation, the number of exposed devices running PAN-OS stood at 6,605. That's based on <a target="_blank" href="https://dashboard.shadowserver.org/statistics/iot-devices/time-series/?date_range=other&d1=2024-11-09&d2=2024-11-18&vendor=palo+alto+networks&model=pan-os+management+interface&dataset=count&limit=1000&group_by=geo&style=stacked" rel="nofollow">data from November 18</a>, the latest available. 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Palo Alto Networks patches firewall-busting zero-days • The Register