{"id":7661,"date":"2018-09-19T06:39:46","date_gmt":"2018-09-19T06:39:46","guid":{"rendered":"http:\/\/blog.nsfocusglobal.com\/?p=1631"},"modified":"2025-07-09T07:10:43","modified_gmt":"2025-07-09T07:10:43","slug":"vulnerabilities-discovered-in-nuuo-network-video-recorder","status":"publish","type":"post","link":"https:\/\/nsfocusglobal.com\/pt-br\/vulnerabilities-discovered-in-nuuo-network-video-recorder\/","title":{"rendered":"Vulnerabilities Discovered in NUUO Network Video Recorder"},"content":{"rendered":"<p>Tenable Research released two vulnerabilities in NVRMini2, NUUO&#8217;s Network Video Recorder software on September 17th. Risk information is as below:<\/p>\n<p><a href=\"https:\/\/staging.nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/Risk-Info.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-1632\" src=\"https:\/\/staging.nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/Risk-Info.png\" alt=\"\" width=\"361\" height=\"292\" \/><\/a><\/p>\n<p>Reference link: <a href=\"https:\/\/www.tenable.com\/security\/research\/tra-2018-25\">https:\/\/www.tenable.com\/security\/research\/tra-2018-25<\/a><\/p>\n<p>Attack demo: <a href=\"https:\/\/www.youtube.com\/watch?v=2EuFOZfRL4U\">https:\/\/www.youtube.com\/watch?v=2EuFOZfRL4U<\/a><\/p>\n<p>Sketch of NVRMini2 structure\uff1a<\/p>\n<p><a href=\"https:\/\/staging.nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/NVRMini2-Structure.png\"><img decoding=\"async\" class=\"alignnone size-full wp-image-1633\" src=\"https:\/\/staging.nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/NVRMini2-Structure.png\" alt=\"\" width=\"1438\" height=\"631\" srcset=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/NVRMini2-Structure.png 1438w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/NVRMini2-Structure-300x132.png 300w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/NVRMini2-Structure-1024x449.png 1024w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/NVRMini2-Structure-768x337.png 768w\" sizes=\"(max-width: 1438px) 100vw, 1438px\" \/><\/a><\/p>\n<h3>Vulnerability Description<\/h3>\n<p><strong>CVE-2018-1149: Unauthenticated Remote Stack Buffer Overflow<\/strong><\/p>\n<p>The HTTP interface exposes the binary <em>cgi_system<\/em> through the <em>http:\/\/&lt;target&gt;\/cgi-bin\/cgi_system<\/em> endpoint. Much of the functionality of <em>cgi_system<\/em> requires the remote user to be authenticated. One of the ways the system verifies authentication is by comparing the session identifier in the user&#8217;s <em>PHPSESSID<\/em> cookie against the session file stored in <em>\/tmp\/<\/em>. In the following screenshot, you can see how the system builds up the filename of the <em>tmp<\/em> file.<\/p>\n<p><a href=\"https:\/\/staging.nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/overflow_0.png\"><img decoding=\"async\" class=\"alignnone size-full wp-image-1634\" src=\"https:\/\/staging.nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/overflow_0.png\" alt=\"\" width=\"403\" height=\"307\" \/><\/a><\/p>\n<p>The value returned from <strong>sub_534a4<\/strong> is the session identifier string. The string has not been limited to any size. Similarly there is no bounds check when the string is passed into <strong>sprintf<\/strong> to build the tmp filename. As such a remote unauthenticated attacker can overflow the stack buffer passed into <strong>sprintf<\/strong>. A one line proof of concept looks like this:<\/p>\n<p><a href=\"https:\/\/staging.nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/Testing-code.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1641\" src=\"https:\/\/staging.nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/Testing-code.png\" alt=\"\" width=\"578\" height=\"110\" srcset=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/Testing-code.png 578w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/Testing-code-300x57.png 300w\" sizes=\"(max-width: 578px) 100vw, 578px\" \/><\/a><\/p>\n<p>Furthermore, this overflow is exploitable to achieve remote code execution. This is particularly devastating because not only is an attacker able to control the NVR but the credentials for all the cameras connected to the NVR are stored in plaintext on disk.<\/p>\n<p><strong>CVE-2018-1150: Backdoor<\/strong><\/p>\n<p>A common idiom in the NVRMini2&#8217;s PHP code base is to first:<\/p>\n<ol>\n<li>Check that the current PHP session is valid.<\/li>\n<li>Verify the session has appropriate permissions for the page being accessed (ie. admin, poweruser, user, root, guest).<\/li>\n<\/ol>\n<p>However, a back door code appears in check_session_is_valid():<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"568\">if (file_exists(constant(&#8220;MOSES_FILE&#8221;))) \/\/back door<\/p>\n<p>{<\/p>\n<p>update_session();<\/p>\n<p>return 0;<\/p>\n<p>}<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Not a &#8220;back door&#8221; comment, it appears just like that in the code base. The constant(&#8220;<em>MOSES_FILE<\/em>&#8220;) turns out to be <em>\/tmp\/moses<\/em>.\u00a0 If the file <em>\/tmp\/moses\/<\/em> exists on the file system then an unauthenticated remote attacker can list all of the non-admin users and change their passwords:<\/p>\n<p><a href=\"https:\/\/staging.nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/change-password-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1640\" src=\"https:\/\/staging.nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/change-password-1.png\" alt=\"\" width=\"594\" height=\"488\" srcset=\"https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/change-password-1.png 594w, https:\/\/nsfocusglobal.com\/wp-content\/uploads\/2018\/09\/change-password-1-300x246.png 300w\" sizes=\"(max-width: 594px) 100vw, 594px\" \/><\/a><\/p>\n<h3>Solution<\/h3>\n<p>At the time of disclosure, Tenable has not provided any solution yet. But they recommended users to keep their devices from being exposed to the internet and appropriately isolate the device on their networks.<\/p>\n<h3>NSFOCUS&#8217;s Solution<\/h3>\n<p><strong>Detection<\/strong><\/p>\n<ol>\n<li>Use NSFOCUS Web Vulnerability Scanning System (WVSS ) and\/or\u00a0 NSFOCUS Remote Security Assessment System (RSAS) to detect your vulnerable devices.<\/li>\n<li>Use NSFOCUS Network Intrusion Detection System (NIDS) to detect attack signatures in your network.<\/li>\n<\/ol>\n<p><strong>Protection<\/strong><\/p>\n<p>Use NSFOCUS Web Application Firwall (WAF), NSFOCUS Next-gen Firewall (NF), and\/or NSFOCUS Network Intrusion Prevention System (NIPS) to isolate or block attacks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tenable Research released two vulnerabilities in NVRMini2, NUUO&#8217;s Network Video Recorder software on September 17th. Risk information is as below: Reference link: https:\/\/www.tenable.com\/security\/research\/tra-2018-25 Attack demo: https:\/\/www.youtube.com\/watch?v=2EuFOZfRL4U Sketch of NVRMini2 structure\uff1a Vulnerability Description CVE-2018-1149: Unauthenticated Remote Stack Buffer Overflow The HTTP interface exposes the binary cgi_system through the http:\/\/&lt;target&gt;\/cgi-bin\/cgi_system endpoint. Much of the functionality of cgi_system [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7758,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[3,6],"tags":[],"class_list":["post-7661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-emergency-response"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Vulnerabilities Discovered in NUUO Network Video Recorder - NSFOCUS<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vulnerabilities Discovered in NUUO Network Video Recorder - NSFOCUS\" \/>\n<meta property=\"og:description\" content=\"Tenable Research released two vulnerabilities in NVRMini2, NUUO&#039;s Network Video Recorder software on September 17th. 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