{"id":74,"date":"2022-09-20T09:10:00","date_gmt":"2022-09-20T09:10:00","guid":{"rendered":"https:\/\/nobugescapes.com\/?p=74"},"modified":"2023-05-23T11:50:21","modified_gmt":"2023-05-23T11:50:21","slug":"privilege-escalation-from-user-operator-to-system-administrator","status":"publish","type":"post","link":"https:\/\/nobugescapes.com\/blog\/privilege-escalation-from-user-operator-to-system-administrator\/","title":{"rendered":"Privilege escalation from user operator to System administrator"},"content":{"rendered":"\n<p>CVE 2022-38351<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Product &amp; Service Introduction:<\/h3>\n\n\n\n<p><a href=\"https:\/\/www.supremainc.com\/en\/platform\/hybrid-security-platform-biostar-2.asp\">BioStar <\/a>2 is a web-based, open, and integrated security platform that provides comprehensive functionality for access control, time &amp; attendance management, visitor management, and video log maintenance. It encrypts all personal data available and supports both SDKs and web APIs to integrate BioStar 2 with third-party software. In addition, users can control BioStar 2 platform remotely with the mobile app for BioStar 2 and manage a mobile access card that they can use to access sites.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Technical Description:<\/h3>\n\n\n\n<p>On Bio star 2 web application there are 7 different Operator levels, each rule has a different Privilege where the \u201c<strong><u>Administrator<\/u><\/strong>\u201d has the full permission to do everything on the web application while the <strong><u>\u201cUser Operator\u201d <\/u><\/strong> has limited privilege, but due to missing server-side validation, I identified a way to escalate my Privilege from User Operator to system Administrator the attacker should be authenticated to the target website and logged in as \u201cUser Operator\u201d to exploit this vulnerability<\/p>\n\n\n\n<p>The security risk of the vulnerability is High with a CVSS (common vulnerability scoring system) count of 8.8<br><br>Successful exploitation of the vulnerability results in gaining admin privilege giving the attacker the ability to control the entire system such as <\/p>\n\n\n\n<ul>\n<li>Delete, Modify and add any user<\/li>\n\n\n\n<li>Delete, Modify and add any door<\/li>\n\n\n\n<li>Access to all user&#8217;s information from the Active directory if the system was integrated with the AD and much more.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Proof of Concept (POC):<\/h3>\n\n\n\n<ul>\n<li>Login to the Web Application Using your <strong><u>\u201cUser Operator\u201d<\/u><\/strong><\/li>\n\n\n\n<li>From the editing profile page intercept the request using burp suite then click on &#8220;User&#8221;<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"975\" height=\"416\" src=\"https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-1.png\" alt=\"\" class=\"wp-image-78\" srcset=\"https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-1.png 975w, https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-1-300x128.png 300w, https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-1-768x328.png 768w\" sizes=\"(max-width: 975px) 100vw, 975px\" \/><\/figure>\n\n\n\n<ul>\n<li>Apply the changes, then change the parameter &#8220;id&#8221; value from 255 to &#8220;1&#8221;. Simply 1 stands for admin 255 for users&#8217; permission.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"975\" height=\"432\" src=\"https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-2.png\" alt=\"\" class=\"wp-image-79\" srcset=\"https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-2.png 975w, https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-2-300x133.png 300w, https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-2-768x340.png 768w\" sizes=\"(max-width: 975px) 100vw, 975px\" \/><figcaption class=\"wp-element-caption\"><em>Updated PUT request, the value has been changed from 255 to 1.<\/em><\/figcaption><\/figure>\n\n\n\n<ul>\n<li>Almost done the privilege has been escalated from user operator to system administrator, logout then login again to the dashboard to see the changes.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-3.png\" alt=\"\" class=\"wp-image-80\" width=\"610\" height=\"254\" srcset=\"https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-3.png 975w, https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-3-300x125.png 300w, https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-3-768x321.png 768w\" sizes=\"(max-width: 610px) 100vw, 610px\" \/><figcaption class=\"wp-element-caption\">Admin User <\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Exploit using python:<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"975\" height=\"457\" src=\"https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-4.png\" alt=\"\" class=\"wp-image-81\" srcset=\"https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-4.png 975w, https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-4-300x141.png 300w, https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-4-768x360.png 768w\" sizes=\"(max-width: 975px) 100vw, 975px\" \/><figcaption class=\"wp-element-caption\"><em>Python script, that take 2 inputs from the user<\/em><\/figcaption><\/figure>\n\n\n\n<p><em>&#8211;userid = the current user id on the system<\/em><\/p>\n\n\n\n<p><em>&#8211;token the session token for the logged in user to send a PUT request then update the User Operator level.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"975\" height=\"345\" src=\"https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-5.png\" alt=\"\" class=\"wp-image-82\" srcset=\"https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-5.png 975w, https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-5-300x106.png 300w, https:\/\/nobugescapes.com\/wp-content\/uploads\/2022\/08\/image-5-768x272.png 768w\" sizes=\"(max-width: 975px) 100vw, 975px\" \/><figcaption class=\"wp-element-caption\"><em>Running the script<\/em><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Solution &#8211; Fix &amp; Patch:<\/h3>\n\n\n\n<p>Suprema recommend using the latest version of Bio star 2, at the time of publishing the blog | 2022 Q4, v2.9.1.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE 2022-38351 Product &amp; Service Introduction: BioStar 2 is a web-based, open, and integrated security platform that provides comprehensive functionality for access control, time &amp; attendance management, visitor management, and video log maintenance. It encrypts all personal data available and supports both SDKs and web APIs to integrate BioStar 2 with third-party software. In addition, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[9],"tags":[5],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Privilege escalation from user operator to System administrator -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nobugescapes.com\/blog\/privilege-escalation-from-user-operator-to-system-administrator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Privilege escalation from user operator to System administrator -\" \/>\n<meta property=\"og:description\" content=\"CVE 2022-38351 Product &amp; Service Introduction: BioStar 2 is a web-based, open, and integrated security platform that provides comprehensive functionality for access control, time &amp; attendance management, visitor management, and video log maintenance. 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